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Assessing depth of influence of intelligent compaction rollers by integrating laboratory testing and field measurements Transp. Geotech. (IF 2.436) Pub Date : 2020-12-31 Aria Fathi; Cesar Tirado; Sergio Rocha; Mehran Mazari; Soheil Nazarian
One concern usually expressed about the implementation of Intelligent Compaction (IC), especially in tandem with modulus-based spot tests, is the uncertainty in the depth of influence of different devices. The depth of influence is mainly contingent upon the weight, dimensions, and operating settings of the employed roller as well as the characteristics of the underlying materials. This study attempts
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Dynamic behavior of natural sand soils and fiber reinforced soils in heavy-haul railway embankment under multistage cyclic loading Transp. Geotech. (IF 2.436) Pub Date : 2021-01-05 Yingying Zhao; Yang Yang; Xianzhang Ling; Weiming Gong; Guoyu Li; Lei Su
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Large-scale Testing Facility for Heavy Haul Track Transp. Geotech. (IF 2.436) Pub Date : 2021-01-22 Buddhima Indraratna; Trung Ngo; Fernanda Bessa Ferreira; Cholachat Rujikiatkamjorn; Ameyu Tucho
Given the substantially increased demand for increased axle loads of heavy haul trains, there is an imperative need to develop sustainable track infrastructure. When subjected to heavy axle loading, ballast aggregates rapidly break down, compromising the particle friction and associated load bearing capacity. Therefore, understanding the deformation and degradation (breakage) of ballast subjected to
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Cyclic behavior of semi-rigid recovered plastic blends in railway track substructure Transp. Geotech. (IF 2.436) Pub Date : 2021-01-18 Mahdi Naeini; Alireza Mohammadinia; Arul Arulrajah; Suksun Horpibulsuk
Plastic deformation of granular layers in railway tracks under cyclic loading is a key factor controlling the substructure’s stability. In particular, the granular subballast capping layer placed between the ballast and subgrade can undergo permanent deformations due to the moving wheel load of trains. This study was conducted to evaluate the cyclic behavior of recovered plastic (RP) blended at different
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Scalar- and vector-valued vulnerability analysis of shallow circular tunnel in soft soil Transp. Geotech. (IF 2.436) Pub Date : 2020-12-29 Zhong-Kai Huang; Dong-Mei Zhang
This paper presents a scalar- and vector-valued vulnerability analysis of shallow circular tunnel in soft soil. Numerous dynamic analyses were firstly performed to capture seismic response of the tunnel lining under transversal seismic shaking. Subsequently, a series of 15 intensity measures (IMs) are selected and tested to find the optimal IM used in the scalar-valued vulnerability analysis. The selected
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A novel approach for classification of soils based on laboratory tests using Adaboost, Tree and ANN modeling Transp. Geotech. (IF 2.436) Pub Date : 2020-12-31 Binh Thai Pham; Manh Duc Nguyen; Trung Nguyen-Thoi; Lanh Si Ho; Mohammadreza Koopialipoor; Nguyen Kim Quoc; Danial Jahed Armaghani; Hiep Van Le
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Impact of monotonic and cyclic suction variations on the thermal properties of a stabilized compacted silty soil Transp. Geotech. (IF 2.436) Pub Date : 2021-01-15 Hamza Menaceur; Olivier Cuisinier; Farimah Masrouri; Hossein ESLAMI
The soil stabilisation is employed to construct geostructures as embankments, river levees, road subbases or to backfill excavations, improving the mechanical behaviour and reducing the consumption of extracted primary aggregates. This study is focused on the use of lime/cement treated soils to backfill trenches where high power line cables are buried. Indeed, under these circumstances not only the
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A probabilistic approach for the evaluation of the stabilizing forces of fully grouted bolts Transp. Geotech. (IF 2.436) Pub Date : 2021-01-15 Pierpaolo Oreste; Giovanni Spagnoli
The essential task of the ground reinforcement techniques is to keep the rock as stable as possible. In particular passive rock bolt should resist the rock movements along its entire length and through the resulting reaction forces, to improve the load-bearing capacity of the rock. Among different calculation techniques, the calculations based on Block Reinforcement Procedure (BRP) was used in this
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Deformation behaviour and influence mechanism of thaw consolidation of embankments on the Qinghai-Tibet Railway in permafrost regions Transp. Geotech. (IF 2.436) Pub Date : 2021-01-14 Chen-xuan Tang; Zhan-yuan Zhu; Fei Luo; Zong-hang He; Zu-yin Zou; Zi-hong Guo
With the thermal disturbance caused by engineering construction and global warming, thaw consolidation has become a primary source of subgrade deformation in permafrost regions. Based on the large-strain consolidation theory described by the updated Lagrangian, we study the thermal stability and the thaw consolidation in an ordinary subgrade at the warm and ice-rich permafrost (WIRP) site of the Beiluhe
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Machine learning methods to map stabilizer effectiveness based on common soil properties Transp. Geotech. (IF 2.436) Pub Date : 2020-12-31 Amit Gajurel; Bhaskar Chittoori; Partha Sarathi Mukherjee; Mojtaba Sadegh
Most chemical stabilization guidelines for subgrade/base use unconfined compressive strength (UCS) of treated soils as the primary acceptance criteria for selecting optimum stabilizer in laboratory testing. Establishing optimal additive content to augment UCS involves a resource-intensive trial-and-error procedure. Also, samples collected from discrete locations for laboratory trials may not be representative
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Resilient modulus experiment of subgrade soil on different wetting–drying and salt washing–supplying paths Transp. Geotech. (IF 2.436) Pub Date : 2021-01-13 Xirong Niu; Yangping Yao
Climate change and human action significantly impact the state of soil, particularly saline and loess soils in China's arid and semi-arid regions. Infrastructure is continuously built on these problematic soil areas, making it crucial to study the impact of external factors on the engineering properties of subgrade soil. This paper proposes a test device by which a few physical conditions (salt content
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Coupling effects of particle shape and cyclic shear history on shear properties of coarse-grained soil–geogrid interface Transp. Geotech. (IF 2.436) Pub Date : 2020-12-25 Mengjie Ying; Feiyu Liu; Jun Wang; Chaoliang Wang; Mingfeng Li
Accurate measurement of particle shape is necessary to properly investigate the cyclic shear behavior of a soil–geogrid interface. In this study, the particle shapes of crushed limestone, quartz sand, round gravel and spherical granular media were described and quantified in terms of particle regularity. Cyclic direct shear tests were then performed with particles of various shapes for different relative
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Upper and lower bounds for three-dimensional undrained stability of shallow tunnels Transp. Geotech. (IF 2.436) Pub Date : 2021-01-08 A.N. Antão; M. Vicente da Silva; N. Monteiro; N. Deusdado
This paper deals with the determination of upper and lower bounds for the three-dimensional undrained stability of shallow tunnels. The tunnel is circular and a distance between its face and its lining is considered. The soil shear strength is modeled using the Tresca criterion. Results of the upper and lower bounds of the stability number are presented, for several geometrical and resistance configurations
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Interference influence on behavior of shallow footings constructed on soils, past studies to future forecast: A state-of-the-art review Transp. Geotech. (IF 2.436) Pub Date : 2020-12-19 Mahmoud Ghazavi; Pezhman Fazeli Dehkordi
In practice, footings may be constructed near each other which results in an interaction between foundations and leads to significant effect on bearing capacity (BC), failure mechanism, footing settlement and tilting. This paper reviews comprehensively the progress and state-of-the-art relevant to footing interference investigations and applications. This review covers experimental and theoretical
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Study on the damage evolution in secondary tunnel lining under the combined actions of corrosion degradation of preliminary support and creep deformation of surrounding rock Transp. Geotech. (IF 2.436) Pub Date : 2020-12-21 Guowen Xu; Marte Gutierrez
This paper presents a numerical approach to study the damage evolution of secondary tunnel lining under the combined actions of corrosion of the preliminary support and the creep deformation of the surrounding rock. This improved numerical approach contains three main models for: (1) tensile failure of corroding rock bolt; (2) yielding of corroding supporting steel arch; and (3) elastoplastic damage
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Evaluating gantry crane-way pavement performance: An inverse approach Transp. Geotech. (IF 2.436) Pub Date : 2021-01-01 Parnian Ghasemi; Mohamad Aslani; Jeramy C. Ashlock; R. Christopher Williams; Vernon R. Schaefer
Gantry-crane pavements and foundations are significant assets within intermodal facilities. The performance of these pavements, which are subjected to highly-variable loads, is critical to safe operations. Traffic interruptions and costs associated with maintaining and rehabilitating distressed or failed pavements in associated areas are of particular importance. The purpose of this study was to evaluate
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Durability evaluation of reclaimed asphalt pavement, ground glass and carbide lime blends based on unconfined compression tests Transp. Geotech. (IF 2.436) Pub Date : 2020-10-31 Nilo Cesar Consoli; Aziz Tebechrani Neto; Brenda Rielli Spier Correa; Rubén Alejandro Quiñónez Samaniego; Nuno Cristelo
The use of domestic, industrial and construction waste has been gaining considerable space in recent decades in view of the social and environmental concern in preserving and reusing natural resources. Thus, this article has the premise of studying the use of the mixture of three residues, evaluating the feasibility of using these as a pavement layer. The first residue is the reclaimed asphalt pavement
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The microscopic mechanisms of treating collapsible loess with vibratory probe compaction method Transp. Geotech. (IF 2.436) Pub Date : 2020-12-15 Changhui Gao; Guangyin Du; Songyu Liu; Huan He; Dingwen Zhang
Although satisfactory treatment effect was achieved from a recent foundation reinforcement practice, where a foundation composed of collapsible loess was treated with the vibratory probe compaction method in northwest China, the mechanisms of the reinforcement was unclear. To reveal the reinforcement mechanism, a series of experimental tests, including scanning electron microscopy, mercury intrusion
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Artificial intelligence forecasting models of uniaxial compressive strength Transp. Geotech. (IF 2.436) Pub Date : 2020-12-17 Arsalan Mahmoodzadeh; Mokhtar Mohammadi; Hawkar Hashim Ibrahim; Sazan Nariman Abdulhamid; Sirwan Ghafoor Salim; Hunar Farid Hama Ali; Mohammed Kamal Majeed
The uniaxial compressive strength (UCS) is a vital rock geomechanical parameter widely used in rock engineering projects such as tunnels, dams, and rock slope stability. Since the acquisition of high-quality core samples is not always possible, researchers often indirectly estimate these parameters. The main objective of the present study is to evaluate the performance of the long short term memory
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A novel application of thermoplastic polyurethane/waste rubber powder blend for waterproof seal layer in high-speed railway Transp. Geotech. (IF 2.436) Pub Date : 2020-12-22 Xin Xiao; Jiayu Wang; Degou Cai; Liangwei Lou; Feipeng Xiao
The moisture induced damage is considered a serious threat to the durability of the high-speed railway system. In this paper, an innovative application of thermoplastic polyurethane/waste rubber powder blend (TPU/WRP) with higher elastic modulus was introduced to enhance the water resistance of high-speed railway structure as a waterproof seal layer. The thermoplastic polyurethane has been proved to
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Experimental insights into the stiffness degradation of subgrade soils prone to mud pumping Transp. Geotech. (IF 2.436) Pub Date : 2020-12-14 Mandeep Singh; Buddhima Indraratna; Thanh Trung Nguyen
Recent laboratory investigations conducted on soils prone to mud pumping have shown that the subgrade soil experiences softening associated with an internal redistribution of moisture when the cyclic stress ratio (CSR) exceeds a certain critical level. This article aims to evaluate the stiffness degradation of these problematic subgrade soils subjected to a wide range of loading conditions. The test
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The effect of increased axle loading on the behavior of heavily overconsolidated railway foundation materials Transp. Geotech. (IF 2.436) Pub Date : 2020-12-15 G.D. Mpye; P.J. Gräbe
The benefits of increased axle loading in the railway industry are well-appreciated to such an extent that increased axle loading has become a themed topic of interest across all disciplines of railway engineering. However, it remains important to understand the engineering behavior and performance of each track component under increased axle loading. This study was particularly interested in the behavior
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Stabilization of expansive soil using hydrophobic polyurethane foam: A review Transp. Geotech. (IF 2.436) Pub Date : 2020-12-15 M.E. Al-Atroush; T.A. Sebaey
Despite the variety of available stabilization methods for the expansive soil, a rapid stabilization and remediation solution for this class of the problematic soil is still needed. Among the available treatment methods, traditional chemical additives such as lime, and cement exhibit satisfying performance over their counterparts. Nevertheless, significant concerns are associated with those chemicals
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Dynamic prediction models of rock quality designation in tunneling projects Transp. Geotech. (IF 2.436) Pub Date : 2020-12-29 Arsalan Mahmoodzadeh; Mokhtar Mohammadi; Hunar Farid Hama Ali; Sazan Nariman Abdulhamid; Hawkar Hashim Ibrahim; Krikar M Gharrib Noori
Machine learning (ML) is becoming an appealing tool in various fields of civil engineering, such as tunneling. A very important issue in tunneling is to know the geological condition of the tunnel route before the construction. Various geological and geotechnical parameters can be considered according to data availability to define tunnels' ground conditions. The Rock Quality Designation (RQD) is one
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Performance of calcium lignosulfonate as a stabiliser of highly expansive clay Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Mariano T. Fernández; Sandra Orlandi; Mauro Codevilla; Teresa M. Piqué; Diego Manzanal
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Experimental study on cyclic settlement of piles in silt soil and its application in high-speed railway design Transp. Geotech. (IF 2.436) Pub Date : 2020-12-19 Yunmin Chen; Shengnan Ma; Yu Ren; Renpeng Chen; Xuecheng Bian
Pile-supported embankment is popularly used for constructing high-speed railways on soft soils. With train running at high speed, the dynamic load on the pile top generated by the train passages increases noticeably. To keep the long-term settlement of the railway track within a reasonable range, it is necessary to investigate the settlement of piles in soils simultaneously subject to the monotonic
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Effects of compaction and suction on the hydromechanical properties of a dam core clay Transp. Geotech. (IF 2.436) Pub Date : 2020-12-17 Karima Lachgueur; Nabil Abou-Bekr; Said Taibi; Jean-Marie Fleureau
The paper presents an experimental study of the hydromechanical behavior of a compacted clay used in the design of the core of the Boughrara dam (western Algeria). The influence of compaction energy level (CEL) is explored using three different energies: Standard Proctor energy (SP), reduced Proctor energy (SP-20 blows) and enhanced Proctor energy (SP+ 20 blows). The resulting compaction curves are
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Effect of compaction delay on the strength and consolidation properties of cement-stabilized subgrade soil Transp. Geotech. (IF 2.436) Pub Date : 2020-12-15 Zeynab Nazari; Alireza Tabarsa; Nima Latifi
Soil compaction is a considerable construction activity to ensure safety and durability, notably in the transportation industry. Compaction delay (CD) occurs because of unpredictable cases which may be related to the climatic, environmental, and logistics reasons. Since the time delay in compaction process affects the engineering properties of the materials in road construction, the current study evaluates
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Analytical solutions and in-situ measurements on the internal forces of segmental lining produced in the assembling process Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Meng-bo Liu; Shao-ming Liao; Jin Xu; Yan-qing Men
Most of the traditional design methods assumed shield tunnel lining as a perfectly formed ring, without special attention to the effect of pre-deformations and inaccuracies produced in the assembling process before the segmental ring is closed. However, these factors can significantly affect the mechanical performance and durability of the tunnel. To make up for the deficiencies of conventional design
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Determining the resilient modulus of sandy subgrade using cyclic light weight deflectometer test Transp. Geotech. (IF 2.436) Pub Date : 2020-12-04 Dina Kuttah
Resilient modulus is one of the important parameters used in the analysis and modelling of subgrade behaviour and it is directly related to the safety, economic and lifetime of roads structures. The determination of Resilient Modulus (MR) using repeated load triaxial (RLT) test is expensive, cumbersome and time consuming. Therefore, a new research approach has been adopted in this study based on performing
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Fully-coupled numerical model for ballasted track analysis – Field measurements and predictions Transp. Geotech. (IF 2.436) Pub Date : 2020-12-18 Reda Mezeh; Hussein Mroueh; Mohsen Hosseingholian; Marwan Sadek
This paper proposes a three-dimensional fully-coupled numerical model intended for the simulation of the dynamic behavior of ballasted railway tracks under real excitation. It is employed to reproduce the response of a French site located at the high-speed line connecting the two regions Bretagne and Pays de la Loire. The equation of motion is solved in the time domain by means of the finite difference
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Study of controlled leaching process of steel slag in soxhlet extractor aiming employment in pavements Transp. Geotech. (IF 2.436) Pub Date : 2020-12-07 Antonio Carlos Rodrigues Guimarães; Kíssyla Ávila Costa; Marcelo de Miranda Reis; Claudeny Simone Alves Santana; Carmen Dias Castro
This work addresses the characterization of physical, chemical and mechanical properties of steel slag in the employment as an aggregate before and after controlled leaching test in Soxhlet extractor. The material was characterized before going through the stabilization process (virgin slag) and after controlled leaching in different periods of 24, 56, 96, 120 h. The steel slag was subjected in the
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Bio-improved hydraulic properties of sand treated by soybean urease induced carbonate precipitation and its application Part 1: Water retention ability Transp. Geotech. (IF 2.436) Pub Date : 2020-12-07 Yanbo Chen; Yufeng Gao; Charles W.W. Ng; Haowen Guo
Enzyme induced carbonate precipitation (EICP) is an innovative ground improvement technique which can enhance soil properties including soil strength, stiffness and hydraulic conductivity by cementing and filling soil pores. The calcium carbonate precipitation has the potential to influence the water retention ability through altering pore-size distribution and void ratio. This study aims to investigate
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Parameters controlling cyclic behaviour of cement-treated sand Transp. Geotech. (IF 2.436) Pub Date : 2020-12-04 Lucas Festugato; Guilherme Irineu Venson; Nilo Cesar Consoli
The present work aims to study a cement-treated sand through resilient modulus (RM) and fatigue life (Nf) tests. The use of the porosity/cement index (η/Civ) for the assessment of mixtures cyclic response was investigated for the first time. A uniform fine clean sand was cement-treated with varying amounts of Portland cement content (from 1% to 9%) and compacted with different voids ratios (0.64, 0
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Evaluation of Shape Array sensors to quantify the spatial distribution and seasonal rate of track settlement Transp. Geotech. (IF 2.436) Pub Date : 2020-12-05 Ruobing Yan; W. Andy Take; Neil A. Hoult; Jonathan Meehan; Christiane Levesque
Rail track geometry irregularities can lead to ride discomfort for passengers and redistribution of wheel loads potentially causing derailments. Current techniques for monitoring track settlements involve the use of discrete sensors or vehicle mounted sensors, which make it difficult to capture either spatial or temporal variations in settlement. Shape Array sensors (SAA) can potentially be used to
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Maximum safe freight train speed on railway embankments under rapid drawdown conditions based on coupled stress-seepage slope stability analysis Transp. Geotech. (IF 2.436) Pub Date : 2020-12-04 S. Xu; A.M. Zsáki
The rapid drawdown of the water level adjacent to a railway embankment can reduce its stability, which could compromise the safety of train movements. To investigate the effect drawdown on railway embankments as a function of train speed, a coupled finite element-based model was developed accounting for simultaneous deformations, stresses and seepage. To determine maximum safe train speeds, a comprehensive
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Evaluation of polyvinyl alcohol and high calcium fly ash based geopolymer for the improvement of soft Bangkok clay Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Cherdsak Suksiripattanapong; Suksun Horpibulsuk; Chakkrid Yeanyong; Arul Arulrajah
Soft Bangkok clay (SC) is recognized as a problematic soil in Thailand. This research investigates the possibility of using polyvinyl alcohol (PVA) and high calcium fly ash (FA) geopolymers to improve the strength of SC in deep soil mixing applications. The liquid alkaline activator (L) was composed of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The studied influence factors included FA
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Shakedown analysis of PET blends with demolition waste as pavement base/subbase materials using experimental and neural network methods Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Behnam Ghorbani; Arul Arulrajah; Guillermo Narsilio; Suksun Horpibulsuk; Myint Win Bo
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Bio-improved hydraulic properties of sand treated by soybean urease induced carbonate precipitation and its application Part 2: Sand-geotextile capillary barrier effect Transp. Geotech. (IF 2.436) Pub Date : 2020-12-04 Yanbo Chen; Yufeng Gao; Haowen Guo
Nonwoven-geotextile is used to construct soil-geotextile capillary barrier for minimizing water infiltration. However, the sand-geotextile capillary barrier breakthrough can occur due to the low water retention ability and the high saturated permeability coefficient of sand. To address this, enzyme induced carbonate precipitation (EICP) technology was applied to the overlying sand layer to improve
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Numerical modeling of post-flood water flow in pavement structures Transp. Geotech. (IF 2.436) Pub Date : 2020-11-14 Mojtaba Asadi; Rajib Mallick; Soheil Nazarian
Water infiltration through pavement structures as a result of flooding and/or extreme rainfalls, can adversely influence the bearing capacity of the pavement and lead to its premature failure. Since the entire pavement system will not be always in saturated state, the post-flood water movement throughout its granular layers should be formulated based on unsaturated flow principles. This study is aimed
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Effect of freeze–thaw cycles on the resilient moduli and unconfined compressive strength of rubberized recycled concrete aggregate as pavement base/subbase Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Mohammad Saberian; Jie Li
One of the most practical ways to reduce the demand for natural aggregates in the construction industry and dispose of the construction and demolition (C&D) wastes in landfills is using recycled concrete aggregate (RCA) for pavement base and subbase applications. Previous researches have mainly concentrated on the engineering behavior of C&D aggregates under ambient temperature. Little research has
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Influence of aging on hydro-mechanical behavior of unsaturated ballast Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Jiaqiang Yang; Tatsuya Ishikawa; Tianshu Lin; Tetsuya Tokoro; Takahisa Nakamura; Yoshitsugu Momoya
To better understand adverse impacts of aging on track maintenance, the hydro-mechanical behavior of unsaturated fresh and aged ballasts was investigated by means of saturated permeability tests, water retention tests, and monotonic loading triaxial compression tests. Firstly, the aged ballast was prepared through the Los Angeles abrasion (LAA) test to reproduce the gradation and particle shape for
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Effect of strain rate on the adhesive bond shearing resistance of stiff clay Transp. Geotech. (IF 2.436) Pub Date : 2020-11-30 Jian Han; Zhen-Yu Yin; Christophe Dano; Pierre-Yves Hicher
Up to now, the effect of strain rate on the adhesive bond shearing resistance of stiff clay, which plays a fundamental role in constitutive modeling of such kind of soils, remains unclear. This paper aims to experimentally investigate the strain rate dependency of the adhesive bond shearing resistance of stiff clay. Both undisturbed and reconstituted overconsolidated samples of Merville stiff clay
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Application of recycled tire polymer fibers and glass fibers for clay reinforcement Transp. Geotech. (IF 2.436) Pub Date : 2020-11-14 Mehdi Valipour; Piltan Tabatabaie Shourijeh; Alireza Mohammadinia
Soil reinforcement with fibers is a simple, efficient and low-cost (especially by incorporating waste or recycled fibers) technique for enhancing mechanical characteristics of soft soils. This experimental study investigates the effects of recycled tire polymer fibers (RTPF) and glass fibers (GF) on enhancing the strength/deformation properties of clays. A series of compaction, unconfined compression
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Field and numerical investigation of full depth reclamation with Portland cement in Georgia Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Jayhyun Kwon; Youngguk Seo; Jidong Yang; Adam Kaplan
The Full Depth Reclamation (FDR) technique has recently become a popular rehabilitation method to reconstruct old flexible pavement. Pulverized existing roadway materials are blended with stabilizing agents such as foamed asphalt and Portland cement to form a stiff base course for the new pavement. In Georgia, Portland cement is commonly used as a stabilizing agent for FDR stabilization. One of the
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Influence of rice husk ash, lime and cement on compaction and strength properties of copper slag Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Kuldeep Sharma; Arvind Kumar
A total of 77 tests have been carried out on various mixes of copper slag (CS), rice husk ash (RHA), hydrated lime (L), ordinary Portland cement (C) in order to find their compaction and strength characteristics. Modified Proctor compaction (MPC) and unconfined compressive strength (UCS) tests have been performed to investigate the compaction and strength behavior of the various combinations, respectively
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Research on the swelling mechanism of high-speed railway subgrade and the induced railway heave of ballastless tracks Transp. Geotech. (IF 2.436) Pub Date : 2020-11-26 Rui Wang; Jian-jun Cheng; Li Gao; Zhong-guo Li; Yan-lu Qi; Meng-tian Wang; Bo-song Ding
The ballastless track has been a widely-used track form in high-speed railway (HSR), however, its application is seriously hampered by the railway heave, which is mainly caused by subgrade swelling. In order to identify the mechanism of HSR subgrade swelling and the rules of swelling-induced railway heave response, long-term longitudinal-continuous deformation monitoring and layered deformation monitoring
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Numerical and in-situ evaluation of explosive compaction effectiveness in railway subgrade improvement Transp. Geotech. (IF 2.436) Pub Date : 2020-11-14 Morteza Esmaeili; Boheira Tavakoli
Owing to its huge area coverage, explosive Compaction (EC) is as an attractive improvement technique in railway projects. Despite many EC case studies in the literature, few experimental tests are conducted to be used for calibration of numerical models. Thus in this study, a field test is conducted on a railway subgrade and simulated with an advanced numerical model followed by a parametric study
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Geotechnical characterization of plastic waste materials in pavement subgrade applications Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Mukhtar Abukhettala; Mamadou Fall
Scarcity of traditional construction materials has motivated researchers to explore alternatives, and besides crushed glass, reclaimed asphalt pavement, and scrap tires, to name a few, plastic waste (unwanted or unusable plastic objects) has also gained attention in recent years. Plastic waste is traditionally re-used or recycled, but it often ends up as trash on curbsides, in landfills, or in our
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Three-dimensional finite element modeling of corrugated metal pipes Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Islam Ezzeldin; Hany El Naggar
The mechanism of the soil-structure interaction in buried corrugated metal pipes (CMPs) depends primarily on the relative stiffness of the flexible buried pipe and the surrounding compacted backfill material. Several geometric, mechanical, and material characteristics control this complex composite interaction, including the shape and dimensions of the pipe, its burial depth, the effect of the backfill
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Evaluation of geogrid reinforcement of flexible pavement performance: A review of large-scale laboratory studies Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Hossein Alimohammadi; Junxing Zheng; Vernon R. Schaefer; John Siekmeier; Raul Velasquez
Many researchers have conducted laboratory studies for assessing the interaction mechanism of soil and geosynthetics and have shown that the performance of flexible pavement is enhanced by geosynthetic reinforcement through extending their service life or decreasing the base course thickness. However, there is a lack of comprehensive comparisons between different studies. This paper reviews laboratory
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General relationships controlling loss of mass, stiffness and strength of sustainable binders amended sand Transp. Geotech. (IF 2.436) Pub Date : 2020-11-12 Nilo Cesar Consoli; Hugo Carlos Scheuermann Filho; Helena Batista Leon; Mariana da Silva Carretta; Marina Bellaver Corte; Renan Eduardo Cordeiro; Ricardo Daniel Caballero; David Eduardo Lourenço
The idea of using industrial, agrarian, domestic, construction and demolition wastes as sustainable binders substituting Portland cement in stabilization of soils is considered a modern-day concept. The choice of which residues to be used in each specific earthwork is not a simple one, as it largely depends on the distance between where wastes are generated and where they could be used. Material transportation
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Performance evaluation of calcium sulfoaluminate as an alternative stabilizer for treatment of weaker subgrades Transp. Geotech. (IF 2.436) Pub Date : 2020-11-01 J. Pooni; D. Robert; F. Giustozzi; S. Setunge; Y.M. Xie; J. Xia
Problematic soils cause significant damage and distress in pavements from moisture induced volume and strength changes. Calcium based stabilization are well known to permanently stabilize expansive soils. Traditional calcium-based stabilizers typically include lime and cement for ground improvement of plastic clays to enhance strength. Calcium Sulfoaluminate (CSA) cement can be an effective and sustainable
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Permanent deformation analysis of base layers with recycled material: Effect of density and stress level Transp. Geotech. (IF 2.436) Pub Date : 2020-11-13 Jean-Pascal Bilodeau; Erdrick Leandro Perez Gonzalez
Full-depth reclamation techniques present numerous advantages for pavement rehabilitation strategies. The recycling process produces a thick layer of stabilized or unstabilized reclaimed materials, which is used as a new base layer of RAP aggregates. The compaction of the unstabilized thick layer is critical for adequate permanent deformation behaviour of the reclaimed layer. In some agencies, the
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Thermo-seismic performances of a unilateral two-phase closed thermosyphon (TPCT) embankment in earthquake-prone permafrost regions Transp. Geotech. (IF 2.436) Pub Date : 2020-10-21 Shuangyang Li; Wansheng Pei; Chong Wang; Yuanming Lai; Lianghong Shi
As a device for efficient heat transfer working without external power supply or control instrumentation, a two-phase closed thermosyphon (TPCT) is an engineering instrument for protecting permafrost under embankments from thawing. The process and mechanism of heat transfer in TPCT embankments were well investigated using experimental and theoretical methods. However, the mechanical performance of
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Coupled hydraulic-mechanical-air simulation of unsaturated railway embankment under rainfall and dynamic train load Transp. Geotech. (IF 2.436) Pub Date : 2020-11-04 Yi Xie; Shi-jin Feng; Yong-lin Xiong; Lu-lu Zhang; Guan-lin Ye
Performance evaluation of the embankment subject to climate change and dynamic train loads is important to the safety of high speed railway (HSR). In this study, based on an elasto-plastic unsaturated soil model, a coupled hydraulic-mechanical-air finite element analysis method is proposed, which integrates the analysis under rainfall condition and the analysis under dynamic load in one numerical simulation
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Experimental study of the influence of different hole-forming methods on the bearing characteristics of post-grouting pile in Loess Areas Transp. Geotech. (IF 2.436) Pub Date : 2020-09-16 Zhijun Zhou; Fu Xu; Jiangtao Lei; Yang Bai; Chaoran Chen; Tianyu Xu; Zhipeng Zhang; Linxuan Zhu; Tong Liu
This paper studies the bearing characteristics of different types of cast-in-place piles, with or without grouting, based on a bridge construction in Wuqi-Dingbian Expressway. Manual digging piles (MDPs), rotary drilling piles (RDPs), and impact drilling piles (IDPs) are investigated, and an in-situ static load test is carried out on each type of hole-forming method. The post-grouting results show
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Review of current and future bio-based stabilisation products (enzymatic and polymeric) for road construction materials Transp. Geotech. (IF 2.436) Pub Date : 2020-10-22 Veshara Malapermal Ramdas; Prisha Mandree; Martin Mgangira; Samson Mukaratirwa; Rajesh Lalloo; Santosh Ramchuran
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Experimental investigation on train-induced vibration of the ground railway embankment and under-crossing subway tunnels Transp. Geotech. (IF 2.436) Pub Date : 2020-08-29 Xiaohui Zhang; Shunhua Zhou; Chao He; Honggui Di; Jinbiao Si
This paper presents a field measurement of the train-induced vibration in the northwest Shanghai, where Shanghai Metro Line 11 crosses under Beijing-Shanghai Railway. Ground and tunnel accelerations are measured for the separate and simultaneous passages of the ground and subway trains. Vibration characteristics are subsequently analyzed in the time domain and in the frequency domain. Measurement results
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Experimental study of deicing chemical redistribution and moisture mass transfer in highway subsoils during the unidirectional freezing Transp. Geotech. (IF 2.436) Pub Date : 2020-09-01 Assel Sarsembayeva; Askar Zhussupbekov
Deicing chemicals, when applied to pavement surfaces, occasionally deposited on the ground beyond the road pavement, thus lead to their accumulation in roadside soils and producing secondary salinisation of the ground water. In order to explore moisture and chemical mass transfer in highway subsoils during the winter period, 9 non-saline soil samples of 1 m length were subject to simultaneously freeze–thaw
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