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Shaking table test study of a surface frame structure–sand–tunnel system Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-20 Shasha Lu, Cheng Yang, Runbo Ma, Qikun Cao, Hong Xu, Dongxu Zhao, Hang Yin
The dynamic interaction between tunnels and adjacent buildings under seismic action is a complex issue in ensuring the earthquake resistance of modern infrastructure. The seismic response of an entire system poses significant challenges in the structural design and safe operation. To study the seismic response law of tunnels (single and double) passing below a surface frame structure containing a basement
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Deep transfer learning method for detection of internal cavities in concrete-filled steel tube structural elements Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-20 Xinyue Su, Xin Feng, Shilin Gong, Farhad Ansari
Concrete-filled steel tubes (CFSTs) are widely used as structural elements in civil engineering. However, their load-carrying capacities are jeopardized due to construction or materials-related formation of internal cavities. Fiber optic-based Brillouin thermography provides a promising approach to detecting CSFT cavities by identifying the anomalies in thermal grayscale images. A major challenge is
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Stresses induced in a buried corrugated metal arch culvert due to backfilling compaction efforts Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-19 Islam Ezzeldin, Hany El Naggar, John Newhook
The use of flexible buried corrugated metal culverts (CMCs) for traffic and watercourses has recently expanded as a promising technique for shallow underground tunnelling. However, in the design of such structures it is challenging to mimic the performance of the mobilized soil-structure interaction. The backfilling process, with the use of compaction forces, can be considered the major loading mode
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The effect of in-situ stress on blast-induced rock fracture and damage zone Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-19 Qian Li, Haibo Li, Shuaiyang Fu, Xiaofeng Li
The pervasive demand for dynamic rock breakage has cast a new light on the potential challenges involved in blast-induced underground excavations with complex geological conditions. Due to the complexities and high-cost issues associated with field tests, the finite-discrete element method (FDEM) is adopted in this study to explore the evolution of blast-induced damage zone, including the extent of
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Construction risk probability assessment of shield tunneling projects in karst areas based on improved two-dimensional cloud model Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-19 Huaiyuan Sun, Yi Rui, Yanyun Lu, Yiming Dai, Xiang Wang, Xiaojun Li
Tunnel construction in karst areas presents significant risks due to the complex geological environment and inherent uncertainties. Existing risk assessment methods often struggle to adequately capture and quantify these uncertainties, leading to potentially inaccurate evaluations. This study addresses this gap by developing a novel risk assessment system specifically for shield tunnel engineering
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Comprehensive review and future perspectives on prediction and mitigation of tunnel-induced ground settlement: A bibliometric analysis and methodological overview (2002–2022) Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-19 Jian Zhou, Hongning Qi, Kang Peng, Yulin Zhang, Manoj Khandelwal
Predicting and controlling tunnel-induced ground settlement is crucial for ensuring safety and minimizing environmental impact. However, current research methods are varied, each with specific conditions and limitations, making a comprehensive review necessary. In this paper, 1209 research papers on tunnel-induced ground settlement (2002–2022) collected from the Web of Science Core Collection (WoSCC)
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Cyclic seismic pushover testing of a multi-story underground station Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-18 Zhuang Haiyang, Yang Jing, Tang Baizan, Liu Xuchen, Zhang Ji
The experimental approach is crucial for investigating the seismic performance and damage process of underground structures. Considering the shortcomings of the 1-g, centrifuge shaking table and monotonic displacement pushover tests, a large-scale cyclic displacement pushover test method is proposed based on the soil-underground structure dynamic interaction and seismic performance quantification system
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Quantitative interrelations of conditioning and recycling indices of high-saturation clay soils for EPB shield tunnelling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-17 Yao Lu, Ming Huang, Fengwen Lai, Chaoshui Xu, Liqian Peng
It is widely recognized that the improvement effects of the foam on the soil properties during earth pressure balance shield (EPBS) tunnelling can be well characterized by some conditioning evaluation indices such as shear strength, flowability, and compressibility. The number of EPBS has increased significantly worldwide in the past few decades. Consequently, recycling the EPBS muck wastes for other
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Laboratory investigation of rock pillar reinforcement against impact loading by using high-tensile-strength polyurea with different coating thicknesses Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-16 Bobin Hou, Haozhe Xing, Songlin Yue, Pengxian Fan, Yanyu Qiu, Mingyang Wang
Thin spray-on liners (TSLs) have been widely adopted in underground mining as rock support materials owing to their notable tensile strength, elongation capability, and bond strength with rock surfaces. In this study, to evaluate the reinforcing capacity of a high-tensile-strength polyurea-based TSL on rock pillars subjected to dynamic loads, a series of compression, impact, and compression-after-impact
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Optimization of relief hole blasting satisfying synergistic constraints of rock-breaking area and hole-bottom minimum burden Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-14 Haojun Wu, Jiayin Jia, Min Gong, Jiuhong Li, Sijie Wang, Xinxiang Zhao
A strategy to optimize relief hole positions is proposed to enhance the effectiveness of tunnel blasting in rock breaking. This study employed two predefined arithmetic progressions to coordinate the distribution of rock-breaking areas and hole-bottom minimum burdens allocated to each row of holes. Iterative calculations were performed to determine the final position of each row of holes. To determine
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Automatic extraction of geological discontinuities of a tunnel surface by integrating multiple features Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-13 Rongchun Zhang, Xuefeng Yi, Hao Li, Guanming Lu
In water conservancy, transportation, and mining projects, the timely acquisition of geological structural information from tunnels is critical in the analysis of engineering geological problems during the investigation and construction stages. The acquisition of comprehensive and accurate geological information from a tunnel surface remains challenging. This study provides an automatic extraction
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Study of the Physiological Characteristics of Drivers Facing Apparent Changes in Highway Tunnel Structures Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-13 Meng Yang, Hao Ding, Jiawen Liao, Ke Li, Jianzhong Chen
The increasing frequency of structural damage and reinforcement repairs in long-term highway tunnels necessitates an understanding of their effects on drivers. This study examines drivers’ physiological responses to visible structural changes in highway tunnels. Using a vehicle static in-the-loop platform, we created various models of apparent tunnel structure changes for simulated driving experiments
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Optimized deep learning modelling for predicting the diffusion range and state change of filling projects Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-11 Ziyao Xu, Ailan Che, Hanxu Zhou, Yongfang Shen, Weiguo He
Concealment of filling constructions poses significant challenges for quality assurance in filling engineering. Direct surveillance of fill dispersal currently remains infeasible, while conventional detection techniques suffer deficiencies in efficiency. This research proposes a framework integrating elastic wave monitoring and hybrid deep learning for predictive modelling of filling state transitions
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R-C-D-F machine learning method to measure for geological structures in 3D point cloud of rock tunnel face Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-11 Bara Alseid, Jiayao Chen, Hongwei Huang, Hyungjoon Seo
This study introduces an innovative Roughness-CANUPO-Dip-Facet (R-C-D-F) methodology for the measurement of dip angle and direction in geological rock facets. The R-C-D-F method is distinguished by its comprehensive four-step approach, encompassing filtration through roughness analysis, CANUPO analysis, and dip angle filtration, followed by facet segmentation as the measurement step. To achieve precise
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A novel longitudinal bending model of shield tunnel based on discretization of fiber section under the coupling of multiple factors Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-10 Linchong Huang, Xumin Huang, Yu Liang, Yong Chang
The longitudinal equivalent bending stiffness (LEBS) typically exhibits nonlinearity under the coupling of multiple environmental and construction loads. In this research, we propose the Circumferential Joint Fiber Section Model (CJFM) to analyze the longitudinal bending behavior affected by critical factors such as geometric, material, and contact nonlinearities, and the influence range of the circumferential
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Analysis method of radon release during underground cavern excavation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-10 Chuanqing Zhang, Lingyu Li, Zhigang Tao, Qiming Xie
Radon release during underground engineering excavation is mainly from the newly generated fracture surfaces of the rock mass rupture, and the accurate prediction of radon release depends on the quantitative characterization of the rock mass rupture. To examine the correlation between radon release and rock mass rupture, a series of triaxial compression radon release tests were carried out and the
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Strengthening effect of the CFRP method on fire-damaged segments Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-09 Hongbin Chen, Yujing Jiang, Diyang Chen, Xuepeng Zhang, Peng Yan, Bin Wang, Qiwei Lin
To reveal the strengthening effect of the CFRP method on the fire-damaged segment. In this study, the fire-damaged segment was strengthened with the CFRP-PCM method and CFRP-sheet method, respectively. The crack development, deformation characteristics, failure mode, load-bearing behaviour and internal force evolution of the segment specimens were analysed. The results indicated that the CFRP-PCM method
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Constructing underground pedestrian networks: A model based on the source-sink theory and a case study of Xinjiekou in Nanjing City, China Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-07 Rongzheng Xu, Yulu Chen, Zhilong Chen, Dongjun Guo, Ziwei Zhao
Underground pedestrian networks (UPNs), serving as a comprehensive approach for utilising urban underground spaces to address connectivity and spatial challenges, have undergone significant development in numerous major city centres. Well-designed UPNs are pivotal in developing compact cities, bolstering urban resilience, enhancing urban transportation systems, fostering urban renewal, and facilitating
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Catastrophic failure mechanism of underground complexes under deep construction disturbance Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-07 Hanqing Chen, Hao Xiong, Yuanyi Qiu, Zhen-Yu Yin, Xiangsheng Chen
The burgeoning demand for land resources in cities has spurred the development of intricate underground infrastructure networks. Therefore, evaluating the performance and stability of entire existing underground complexes in the event of construction-related disturbances becomes increasingly crucial for ensuring overall urban resilience. This paper adopts a coupled modeling technique of the Finite
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Equivalent continuous numerical simulation of a large-scale underground powerhouse excavation considering the size effect of the jointed rock mass Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-07 Yongjian Zhou, Wenkai Feng, Yunpeng Hu, Xiaoyu Yi, Feng Ji, Wenbin Li
For the stability analysis of the surrounding rock mass of an underground powerhouse, reliable mechanical parameters of the rock mass and appropriate analysis methods are highly important. This paper discusses the rationality of using the mechanical parameters of the representative volume element (RVE) of a jointed rock mass as equivalent mechanical parameters and using the equivalent continuity method
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Performance and damage assessment of fault-crossing road tunnel subjected to internal boiling liquid expanding vapor explosion (BLEVE) Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-06 Ruishan Cheng, Wensu Chen, Hong Hao
Road tunnels constructed in complex rock strata may encounter unfavourable geological formations such as rock faults. Grouting into rock faults around road tunnels or installing flexible joints for tunnel structures have been widely used in engineering practice to improve the performance of fault-crossing road tunnels against static and seismic loads. However, flexible joints with low stiffness and
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Study on the field monitoring, assessment and influence factors of pipe friction resistance in rock Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-05 Zhiyun Deng, Xinrong Liu, Yafeng Han, Peng Ding, Bin Xu, Weisheng Du
Accurate assessment and prediction of the pipe friction resistance are crucial for designing the jacking force, arranging intermediate jacking stations, and setting the sediment removal timing in long-distance rock pipe jacking (PJ) projects. However, the applicability of pipe friction resistance calculation models for PJ in stable and unstable rock strata was not verified in sufficient cases. Besides
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Long-term performance of subway tunnels induced by the symmetrical excavation of semicircular deep foundation pits in the Northeast Region hard silty clay Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-05 Wenchong Tang, Liang Tang, Xianzhang Ling, Xiangxun Kong, Yifan Zhang
This paper presents the first large-scale deep foundation pit adjacent to an operational subway tunnel in the Northeast Region of China under hard silty clay conditions. To study the impact of the excavation on the existing subway, comprehensive field monitoring was conducted for nearly 3 years. Monitoring items include the tunnel bed displacement, vertical/horizontal convergence of tunnel structures
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Rockburst early-warning method based on time series prediction of multiple acoustic emission parameters Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-04 Ke Ma, Hongbo Xie, Fuqiang Ren, Yuan Chang
Rockburst early-warning is crucial for ensuring safety in deep underground engineering. Existing methods primarily focus on classifying rockburst grades, making it challenging to provide timely warnings. This paper proposes a novel rockburst early-warning framework based on time series prediction of acoustic emission (AE) parameters. Six AE parameters (rise time, count, duration, amplitude, absolute
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Study on the maximum ceiling temperature and downstream temperature distribution in inclined tunnel fire Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-04 Chaopeng Sun, Miaocheng Weng, Fang Liu, Haoran Yang, Xinyi Zhu
Constrained by various factors, including terrain, tunnels frequently exhibit slopes. While existing research on fires in inclined tunnels predominantly focuses on the characteristics of smoke flow in large slope tunnels, there is a notable lack of attention given to the study of micro-slope tunnels and important factors such as induced air inflow. Therefore, in this paper, the numerical simulation
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A novel identification technology and real-time classification forecasting model based on hybrid machine learning methods in mixed weathered mudstone-sand-pebble formation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-04 Yong Zeng, Yingjie Wei, Yuyou Yang
Geological challenges in tunnel construction have consistently played a pivotal role in influencing project progress and safety. Accurate tunnel formation data holds the potential to assist in effectively managing various issues encountered during shield tunneling operations. This paper introduces a machine learning methodology for real-time tunnel geological prediction, based on the shield machine
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Study on the coupling mechanism and reinforcement effect of a shield tunnel reinforced by channel steel under side pit excavation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-03 Wei Gang, Wang Qin, Xu Tianbao, Xu Tao, Zhang Zhiguo
To investigate the internal force and deformation response law and reinforcement effect of a shield tunnel reinforced by channel steel in a pit excavation, a self-developed “hydraulic loading system” is used to conduct a full-size test and numerical simulation analysis on a three-ring staggered-seam assembled tube sheet. The results show that the internal force response of the tube sheet on the excavation
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Automated masonry spalling severity segmentation in historic railway tunnels using deep learning and a block face plane fitting approach Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-02 Jack Smith, Chrysothemis Paraskevopoulou, Anthony G. Cohn, Ryan Kromer, Anmol Bedi, Marco Invernici
Masonry lined tunnel condition assessment is a predominantly manual process. It consists primarily of a visual inspection followed by a lengthy and subjective manual defect labelling process. There is therefore much potential for automation. Masonry spalling is a key indicator of a masonry tunnel’s condition. To obtain actionable detail about a tunnel’s condition, it is also necessary to determine
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Investigation and optimization heat and humidity environmental control model in construction tunnels: A multifactorial approach incorporating ventilation parameters and hot water quantity Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-02 Yan Wang, Xiaohan Zhou, Xinrong Liu, Ning Li, Zhanfeng Qi, Jilu Zhang
The high rock temperature and hot water influx in the surrounding area of the tunnel construction cause an excessively humid and environment high temperature inside the excavated area of the tunnel, necessitating urgent investigations into the environmental characteristics coupled with these factors and optimizing the control scheme of the construction environment. The on-site data of the tunnel temperature
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Horizontal response of existing pile induced by adjacent shield tunnelling with large longitudinal slope Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-02 Weizheng Liu, Mingye Wang, Guijun Luo, Weihua Lu, Hongbo Xiao
The horizontal displacement and bending moment of piles due to adjacent shield tunnelling with a large longitudinal slope were investigated. An analytical calculation method for the horizontal response of shield tunnelling to piles was presented, considering the included angle, the tunnel-soil-pile interaction, and the shielding effect of the pile group. A new formula for soil horizontal deformation
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Integrating aboveground and underground environments to enhance underground natural ventilation in the tropics: Case studies in Singapore Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-09-02 Yueming Wen, Siu-Kit Lau, Ke Liu, Zhixin Xu, Jiawei Leng
Ventilation is the primary solution for addressing elevated temperatures, humidity, and pollution with underground environments. Underground natural ventilation stands as a historical and promising strategy to reduce energy consumption and diminish reliance on mechanical ventilation. This study integrates aboveground and underground environments to enhance underground natural ventilation in the tropics
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Data-driven visual model development and 3D visual analytics framework for underground mining Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-31 Ruiyu Liang, Chengguo Zhang, Binghao Li, Serkan Saydam, Ismet Canbulat, Lesley Munsamy
Data visualisation is broadly utilised to aid in presenting complex information, facilitating decision-making, and enhancing operational efficiency in the mining sector. However, due to the extensive utilisation of CAD files and the complexity and difficulty of converting 2D drawings into 3D models, it is challenging to realise (near) real-time 3D data visualisation in mining applications. The difficulties
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A novel structural deformation prediction method based on graph convolutional network during shield tunnel construction Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-30 Cheng Chen, Wei Liu, Manman Dong, Ruiqi Ren, Ben Wu, Peng Tang
During shield tunneling through existing steel reinforced concrete structures, superstructure deformation is an important parameter that reflects the disturbance degree of engineering construction to existing structure. Precisely predicting structural deformation can help engineers adjust shield machine operational parameters and ensure the success of the project. There has been no attempt to study
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Soil-carrying effect induced by super-large-diameter shallow-buried shield tunneling and treatment measures: A case study in Zhuhai, China Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-30 Dong Su, Wei-Hong Yang, Xing-Tao Lin, Xiao Zhang, Zhiyu Zhang, Xiangsheng Chen
With the rapid urbanization and infrastructure development, there is a growing demand for the construction of super-large-diameter tunnels in China. As a result, understanding the impact of tunneling on soil behavior is becoming increasingly important. This paper provides a detailed case study on the construction of a super-large-diameter shallow-buried shield tunnel in Zhuhai, China, with a special
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Development of a theory-monitoring integrated structure joints assessment method of prefabricated underground stations Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-29 Chengyu Hong, Wei Rao, Tong Qiu, Xiangsheng Chen, Lei Wang, Wei Li, Wensheng Yang
Prefabricated assembly structures have been extensively applied for the construction of low carbon and cost effective underground subway stations in China. Engineers faced significant challenges in dealing with the assessment of mechanical performance of structures joints within prefabricated underground station (PUS) structures during construction process. Manual assembly of large-scale prefabricated
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A simplified analytical solution of pipeline response under normal faulting Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-28 Jianfeng Li, Xiaogang Qin, Mingge Ye, Qingshu Chen, Pengpeng Ni, Cungang Lin
Buried pipelines are one of the critical lifeline structures, and the evaluation of pipeline performance under seismic faulting is essential for protection of pipeline networks. This paper explores an analytical solution incorporating implementation of Winkler models around a beam-type structure using the finite difference method to evaluate the pipeline response under normal faulting. The effectiveness
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A numerical strain-softening solution of a circular opening in nonlinear yield rock masses Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-26 Peinan Wu, Qiang Zhang, Shuchen Li, Richeng Liu, Hongying Wang, Guilei Han
Strain-softening behavior occurs when the surrounding rock reaches its peak load, complicating the prediction of stress and displacement. The linear Mohr-Coulomb yield criterion and semi-linear Hoek-Brown yield criterion are widely used in elastoplastic analysis. However, the established criteria struggle to universally describe the nonlinear behavior of various rock types. This study aims to overcome
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Numerical study on the dynamic response characteristics of liquefiable silty sand-rock composite strata – Tunnel system under the influence of the vibration of a shield cutter-head Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-26 Pengcheng Jiang, Mengxi Zhang, Zhanglin Li, Jie Fan, Kai Huang, Guoxing Chen
Unlike the mechanism of earthquake or ocean wave loads, the dynamic response characteristics of the liquefiable strata under the influence of the vibrating loads of the cutter-head of shield tunneling in special strata are unique. This paper investigates the significance of the dynamic interaction between a large-diameter shield tunnel and the liquefiable saturated silty sand strata during the process
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Development of underground communication system for data transmission using Wi-Fi direct and power line communication Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-25 Hajime Ikeda, Oluwafemi Kolade, Ling Cheng, Frederick Cawood, Youhei Kawamura
Safety and productivity are of utmost concern to companies in the underground mining industry. To improve safety and productivity, it is important to understand the underground environment using sensing methods. Such sensors obtain important measurement factors such as temperature, humidity, and gas concentration that assist with accurate decision making. However, it still remains challenging to develop
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Thermo-hydro-mechanical behaviour of energy tunnel in unsaturated soils Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-25 Jinquan Liu, Chao Zhou, Anh Minh Tang
Soils surrounding energy tunnels are often unsaturated, particularly in areas with a low water table. All studies of the mechanical behaviour of energy tunnels focused on saturated or dry soils. Through numerical simulations using a coupled thermo-hydro-mechanical model for unsaturated soils, this study aims to improve the understanding of the interactions between energy tunnels and unsaturated ground
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Investigations of sequential excavation and reinforcement in tunnels based on the extended three-dimensional discontinuous deformation analysis method Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-24 Hongyun Fan, Liping Li, Hongliang Liu, Jingyao Gao, Shen Zhou, Xinbo Jiang, Meixia Wang
The unloading effect of excavation is the key factor leading to rock mass instability, and bolt support is the key means of controlling the stability. However, the original three-dimensional discontinuous deformation analysis method (3D DDA) can only simulate rock mass instability and bolt support after the tunnel is excavated, which makes it difficult to study the effect of tunnel excavation and bolt
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Augmented reality for enhanced documentation and anchor inspection reporting in conventional tunnelling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-24 Oleksandr Melnyk, Marco Huymajer, Dominik Fenzl, Christian Huemer, Robert Wenighofer, Alexandra Mazak-Huemer
This study explores the feasibility of Augmented Reality (AR) technology for efficient quality inspection documentation on tunnel construction sites. Conventional tunnel construction relies heavily on paper-based documentation processes, leading to potential errors and increased documentation and site inspection time requirements. Introducing AR as a digital tool offers a promising solution to address
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Large-deformation finite-element modelling of face instability during tunnelling in clayey soils: Incorporating dynamic excavation process Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-24 Xuejian Chen, Yao Hu, Kai Yao, Rita Leal Sousa
Earth pressure balance (EPB) shield tunnelling plays a crucial role in urban infrastructure development but faces challenges due to potential face instability. Previous studies often overlook the impact of dynamic excavation processes on face stability, particularly in clayey soils. This study proposes a three-dimensional coupled Eulerian-Lagrangian (CEL) large-deformation approach to explore the failure
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Hybrid lattice/discrete element analysis of spalling failure in rock tunnels Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-24 Leandro Lima Rasmussen, Ki-Bok Min
A framework for the discontinuum-based simulation of spalling failure in rock tunnels is proposed. This innovation involves the combined application of the damage-initiation and spalling-limit (DISL) approach with the hybrid lattice/discrete element method (LDEM), a special bonded-block modeling technique that incorporates Rigid Body Spring Network lattice bonds between stochastically generated Voronoi
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A full-scale experimental investigation of natural gas explosion in a 710-m long utility tunnel with multiple pipelines Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-23 Di Chen, Huaixin Zhang, Jun Li, Kuirong Liu, Yuwei Wang, Yuanjie Huang, Zhenglin Mao, Chengqing Wu
Natural gas poses significant risks to the safe operation of utility tunnels, which house multiple critical infrastructure systems, including natural gas pipelines. To date, no full-scale gas explosion tests in utility tunnels have been published, and there is ongoing debate about whether pipelines can withstand such explosions. This study presents the first-ever 1:1-scale experiments conducted in
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KJ-2 bentonite-sand mixture conditions satisfying THM criteria to develop an enhanced buffer for a high-level radioactive waste repository Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-23 Gi-Jun Lee, Seok Yoon
Enhanced buffer materials with improved thermal conductivity are needed to reduce the area of high-level radioactive waste repositories. Enhanced buffer materials can be developed by adding substances to bentonite buffer materials. Sand is one such additive; it is a safe and chemically stable natural material with higher thermal conductivity compared to bentonite. In this study, we compare the properties
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Negative emotion degree in smoke filled tunnel evacuation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-23 Wenhao Li, Miho Seike, Akimasa Fujiwara, Makoto Chikaraishi
In this study, the subjective feelings from questionnaires, the physiological signals-based emotions, and walking speed were investigated by a full-scale smoke-filled tunnel experiment. The physiological signals-based emotions were compared by the subjective feelings. The present mean speed was slower than the results of previous studies regarding evacuation in smoke, and close to the completely darkened
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Study on the minimum safe thickness of water inrush prevention in karst tunnel under the coupling effect of blasting power and water pressure Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-22 Liping Li, Hao Jin, Wenfeng Tu, Zongqing Zhou
The water-filled karst cave in karst area as the disaster source is the energy storage structure of water and mud inrush disaster. Under the strong disturbance and high water pressure of blasting excavation, the water-bearing cracks in the rock mass between the disaster source and the tunnel face evolve to form water inrush channels, resulting in major disasters. In this paper, according to the type
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Assessment of plasticity of muddy soil for earth pressure balance shield tunneling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-21 Koki Nakao, Motoki Shiina, Shinya Inazumi
This research delves into managing the plasticity of muddy soil in earth pressure balance (EPB) shield tunneling, crucial for ensuring tunnel stability and efficient sediment management in urban construction. The study utilizes a combination of a small-scale model experiment and a computer-aided engineering (CAE) analysis through the moving particle simulation (MPS) method to investigate how the plasticity
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Modelling on vibration and failure of rock tunnel under high stress release Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-21 Rui Zhao, Ming Tao, Huatao Zhao, Wenzhuo Cao, Jianbo Zhu
This study aimed to analyze the vibration and deformation resulting from high stress release around a circular tunnel. A two-dimensional model was developed using modal superposition and integral transformation to address this issue. The theoretical results indicated that high initial stress and rapid release rate led to considerable PPV around the tunnel. Under the same stress circumstance and unloading
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Safety evaluation method for operational shield tunnels based on semi-supervised learning and a stacking algorithm Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-21 Dejun Liu, Wenpeng Zhang, Qingqing Dai, Jiayao Chen, Kang Duan, Mingyao Li
The safety assessment of structural defects in operational shield tunnels is crucial for ensuring their serviceability and safe operation. This study developed a novel comprehensive evaluation method for tunnel safety assessment based on semi-supervised learning and a stacking ensemble algorithm. First, in the membership degree calculation of the multidimensional normal cloud model, the importance
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Research on prefabricated metro station structure and key assembly technologies Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-20 Xiuren Yang, Fang Lin
In the severe cold environments of northern China, the inability to conduct open excavation for underground structures during winter often results in extended construction period. To solve the problem of not being able to carry out construction in winter, engineering system research and application of prefabricated assembly construction technology for metro stations have been carried out since 2012
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Synchronous-cross zoned excavation of the oversized basement of Shanghai International Financial Centre by combination of bottom-up and top-down methods: Structural and geotechnical behaviors Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-20 Yong Tan, Ye Lu, Dalong Wang
To date, deep excavations in soft clays were constructed routinely by either the bottom-up (BU) or the top-down (TD) method. Because of its mega size, special underground space arrangements and tight construction schedule, the oversized basement of Shanghai International Finance Centre (SIFC) was divided into five zones for construction, following an innovative synchronous-cross zoned excavation procedure
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Predicting short-term rockburst intensity using a weighted probability stacking model with optimal feature selection and Bayesian hidden layer Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-20 Jiahao Sun, Wenjie Wang, Lianku Xie
Rockburst is the most common and severe geological hazard affecting the safe construction of underground projects, which seriously endangers the security of construction personnel and facilities. This study proposes a weighted probability stacking model with optimal feature selection and Bayesian hidden layer (OFS-Bayes-WPS) to predict short-term rockburst intensity. In this regard, 114 rockburst cases
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Improving the effect of air chambers on micro-pressure waves from tunnel portals: Moderate underdamping Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-19 Feng Liu, Haiyang Lei, Mengjie Wei, Huanwu Sun, Muhammad Yousaf Iqbal, Dawei Chen
This research explores the ability of multiple small air chambers, distributed along railway tunnels, to suppress wavefront steepening and aims to find an effective method to prevent the radiation of unacceptable pressure disturbances from tunnel portals. It does so by utilizing the existing idle space in the tunnel, such as under walkways, and investigates the influence of moderately underdamped air
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Dynamics of in-station time within metro systems: Measurement and determining factors Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-19 Becky P.Y. Loo, Hui Wang
Worldwide, people living in mega cities are increasingly dependent on metro systems. Their travel experience, however, has not been closely examined. In particular, travel time estimates often do not consider in-station time, which can be significant, especially at large interchange stations with multiple exits and platforms. This study represents a novel attempt to measure in-station time dynamics
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Experimental study of flame morphological behaviors and wall heat flux profiles from an adjacent fire with different separation distances in a longitudinally ventilated tunnel Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-18 Yuhang Chen, Qiang Wang, Yanli Miao, Shangqing Tao, Lingyi Di, Yuxuan Ma, Fei Tang, Xiaolei Zhang
An understanding of sidewall incident heat flux exposed to an adjacent fire source is important for evaluating flame wall interactions and the performance of structural systems in longitudinally ventilated tunnels. This work experimentally investigated the total heat flux profiles from an adjacent fire to a tunnel wall surface under the action of longitudinal flow velocity ranging from 0 to 2.5 m/s
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Three-dimensional numerical analysis of twin tunnelling in two-layered soil strata Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-17 C.W.W. Ng, A.Y.Y. Wong, A.D.F. Buenaventura, P.Y. Zhu
Tunnelling induces stress change and displacement in the ground. The excavation of a new tunnel in stratified soil can trigger different patterns of stress redistribution, which may adversely influence nearby tunnels. Research on multi-tunnel interaction has mainly been performed on the assumption of a uniform ground. The effects of different soil stratifications on tunnelling interaction remain poorly
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Shaking table test for near-valley underground station: Influence of diaphragm walls Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-16 Zhikun Wang, Haitao Yu, Zhongjie Zhang, Yi Song, Shu Liu
Diaphragm walls are commonly employed as a permanent support for the building of metro stations near urban valley, and in conjunction with the interior sidewalls of the station structure to withstand the pressure from surrounding soils. Despite their prevalent use, the effect of underground diaphragm walls on the seismic response of stations is not yet fully understood. In this paper, a series of 1-g
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Numerical study on rock blasting assisted by in-situ stress redistribution Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-08-16 Jiajun Ding, Jianhua Yang, Zhiwei Ye, Zhendong Leng, Chuangbing Zhou
During tunnel blasting at deep depths, the rock mass is frequently subjected to high in-situ stress. Except for explosive detonation, the in-situ stress itself, particularly the stress concentration due to stress redistribution, also possesses the potential to cause rock fracture. Then there is a possibility of utilizing the stress redistribution to assist rock fragmentation during blasting. However