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Behaviour of electroosmotic consolidation by electrode configuration and fracture grouting Mar. Georesources Geotech. (IF 1.716) Pub Date : 2021-01-23 Yunguo Du; Chao Zhang; Changfei Gou; Wenwen Wu; Xiaobing Li; Xiuqing Hu; Wang Chaoliang; Li Mingfeng
Abstract Electroosmotic consolidation effect of electrode configuration and fracture grouting with sodium hydroxide were investigated. In this study, a series of laboratory tests were performed by using a homemade electroosmotic cell. Results indicate that electroosmotic consolidation that uses fracture grouting with sodium hydroxide effectively improved the mechanical properties of dredged clay sediment
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Evaluation of the soil characteristic parameters of the Yellow River Subaqueous Delta using CPT Mar. Georesources Geotech. (IF 1.716) Pub Date : 2021-01-23 Zhongnian Yang; Xuesen Liu; Lei Guo; Chao Jia; Xiuting Su; Wei Shi; Xianzhang Ling
Abstract Based on the soil behavior type (SBT) and its parameters (I c) obtained by cone penetration tests (CPTs) in the Yellow River Delta, the standardized shear wave velocity (Vs1), permeability coefficient (k), and fine-grained soil content (FC) were calculated. The fine-grained soil content offshore is higher than that near the coast. The shear wave velocity is primarily distributed in the range
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Engineering application of microbial self-healing concrete in lock channel wall Mar. Georesources Geotech. (IF 1.716) Pub Date : 2021-01-23 Xuan Zhang; Chunxiang Qian
Abstract In this paper, the engineering application of microbial self-healing concrete in ship lock engineering was studied. Researches including the design and batch preparation of microbial self-healing agent, and laboratory tests of microbial self-healing concrete were carried out. A class of self-healing agents containing microbial spores and calcium sources was designed and batch-produced by spray
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Coral reef pore recognition and feature extraction based on borehole image Mar. Georesources Geotech. (IF 1.716) Pub Date : 2021-01-20 Jinchao Wang; Wei Chen; Yiteng Wang; Junpeng Zou
Abstract The coral reef pores are the main reservoir space of oil and gas resources. Through determining the structural form and distribution characteristics of pores, it can be helpful for scientific and reasonable stratigraphic division and reservoir evaluation, and provide basic data for the efficient development of using coral reefs as oil and gas reservoir sites. The core difficulty of interpretation
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Effect of confined boundary and mud-layers on depressurization-based gas recovery and land subsidence in hydrate reservoirs Mar. Georesources Geotech. (IF 1.716) Pub Date : 2021-01-20 Raghvendra Pratap Singh; Rahul Yadav; Krishnamurthy Muralidhar; Malay K. Das
Abstract Hydrate reservoirs present numerous challenges due to their occurrence in ultra-deep regions, presence of mud-layers, unconfined boundaries, and complex morphological heterogeneities. Individual effect of some of these reservoir settings on overall production is known, however, a systematic assessment of their mutual impact on gas production and land subsidence is essential from production
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Effect of initial deviatoric stress on anisotropy of marine clay during principal stress rotation Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-29 Heng Zhuang; Xiuqing Hu; Lin Guo; Li Mingfeng; Wang Chaoliang; Hongke Du; Jingqiang Jin
Abstract The effect of the initial deviatoric stress direction and magnitude of deviatoric stress q on the strain components and non-coaxial behavior of soft marine clay during principal stress rotation was experimentally examined. The strain components and pore water pressure depended considerably on the deviatoric stress direction and q. Through polar diagrams, a notable non-coaxiality was observed
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Responses of suction buckets subjected to sustained vertical uplift loads in sand Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-28 Xingxing Wang; Qing Yang; Xiaowei Tang
Abstract This study presents finite element analysis (FEA) results of suction buckets subjected to vertical sustained uplift loads, focusing on the suction pressure and the displacement responses. The accumulative seepage of water and the heave of the soil in the bucket are the key components of the displacement. The accumulative seepage of water is modelled using a layer of soft elastic material (water
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The behavior of monopile embedded in sand under scour and cyclic loading conditions Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-28 Fen Li; Zhiyuan Zhu; Peisan Tian; Dan Hu; Yifan Li
Abstract The large-diameter monopile, as one of the most used foundations of offshore wind turbines, is subjected to severe sea conditions, such as the cyclic lateral loads induced by wind and waves, as well as the scour induced by the flushing currents. The combined cyclic lateral loads and scour introduces additional complexity and is encountered in offshore wind turbines as well as other offshore
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Analysis of shoreline change between inlets along the coast of Chennai, India Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-28 Rajakan Gracy Margret Mary; Vallam Sundar; Sannasi Annamalaisamy Sannasiraj
Abstract Chennai is a major metropolitan city along the southeast coast of India and is popular for its world’s second longest sandy beach called as Marina beach the shoreline of which has been gradually advancing towards the Bay of Bengal over a century. The advance of the shoreline is due to the construction of breakwaters for the formation of the harbor of Chennai port, one of the 12 major ports
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Influence of surface roughness on the adhesion force between the titanium plate and deep-sea sediment Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-21 Wenbo Ma; Jiaping Li; Qing Cai; Wei Zhu; Caiqian Yang; Shuaicheng Guo
Abstract Stick of the deep-sea sediment on the surface of the mining machine can deteriorate its working efficiency. To resolve this issue, this study aims to reduce the adhesion force along the soil-metal interface by adjusting the roughness of the metal surface. During the experimental study, six types of Titanium samples with different surface roughness were first prepared through surface polishing
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Oil leaking and seeping site in the Persian Gulf detected and studied by satellite observations Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-10 Andrei Yu. Ivanov; Hadi Gerivani
Abstract During remote monitoring of the Persian Gulf to detect oil spills, conducted from 2017 to 2019, leaking oil on the sea surface was observed at an offshore site. The site was located 26 km west of the Sir Abu Nuyar Island in the waters of the United Arab Emirates. A more detailed analysis was conducted using remote sensing data, particularly synthetic aperture radar and optical images from
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Failure mode of monopile foundation for offshore wind turbine in soft clay under complex loads Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-09 Song Dai; Bo Han; Guoxiang Huang; Xiaoqiang Gu; Liu Jian; Shiliang Liu
Abstract Offshore wind turbines (OWT) subjected to long-term complex marine loads are prone to foundation damages, affecting their regular operation. However, the failure mode of the large-diameter monopile foundation under complex marine loads is not well understood. Hence, failure modes of monopile foundation for OWT in soft-soil seabed under unidirectional and multidirectional loads are investigated
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Impacts of soft soil compaction and groundwater extraction on subsidence in the Yellow River Delta Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-09 Yi Zhang; Haijun Huang; Yanxia Liu; Haibo Bi; Zehua Zhang; Kuifeng Wang; Liwen Yan
Abstract Recently, many of the world’s major river deltas have been sinking, making them increasingly vulnerable to floods and storm surges, salinization and permanent inundation. For the Yellow River delta, annual subsidence rates of several to dozens of centimeters have been reported in the past few years. The extraction of a considerable amount of groundwater due to continuous pumping is suggested
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Assessing relative density of carbonate granular soil via dynamic cone penetration field and model tests Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-09 Lan Lin; Sa Li; Liqiang Sun; Tingting Li; Jiangsong Yin
Abstract The dynamic cone penetration test (DCPT) is a common method for assessing the physical and mechanical properties of cohesionless soils. However, current formulas might not be suitable for carbonate granular soil because of its unique engineering properties. In this study, a series of DCPTs were conducted on carbonate granular soil in the field and laboratory using a light dynamic penetrometer
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Application of microbially induced calcium carbonate precipitation (MICP) in sand embankments for scouring/erosion control Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-12-01 Zhaoyu Wang; Nan Zhang; Yong Jin; Qi Li; Junhao Xu
Abstract Embankment is vulnerable to scouring and erosion during heavy rainfall events in most coastal areas in China. In this study, microbially induced calcium carbonate precipitation (MICP) technique was applied for sand embankments for scouring/erosion control. Three small-scale MICP treated sand embankments and one untreated embankment were first prepared using the injection method. Then, a series
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Shear behavior of polyurethane foam adhesive improved calcareous sand under large-scale triaxial test Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-24 Qingsheng Chen; Ronghu Yu; Gaoliang Tao; Jinwei Zhang; Sanjay Nimbalkar
Abstract The mechanical properties of calcareous sands are very different from those of terrestrial sands as the particle crushing occurs under low confining pressure. If the calcareous sand is used as the foundation materials, engineering problems such as the uneven settlement of the foundation are prone to occur. In this paper, the Polyurethane foam adhesive (PFA) is used to improve the calcareous
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Relevant data-based approach upon reliable safety factor for pile axial capacity Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-19 Abolfazl Eslami; Sara Heidarie Golafzani
Abstract Pile foundations are one of the significant marine substructure systems for a variety of offshore and onshore facilities. Thus, optimum and reliable design during their lifetime and under inherent uncertainties is noteworthy. Among various methods for predicting axial pile bearing capacity, cone penetration test (CPT)-based methods enhance geotechnical design to a more satisfying level due
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Numerical investigations on load transfer of mooring line considering chain–seabed dynamic interaction Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-16 Shengjie Rui; Zhen Guo; Lizhong Wang; Haochen Liu; Wenjie Zhou
Abstract Taut or semi-taut mooring lines are often used in deep-sea area to connect the floating structures to the anchors in the seabed. In previous studies, the quasi-static analysis method was adopted to assess the load transfer of the mooring line. However, the inertia effect of mooring line and chain–seabed dynamic interaction cannot be neglected in practice. In this paper, the soil strain rate
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Fore-aft and the side-to-side response of monopile supported offshore wind turbine in liquefiable soil Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-10 Sangeet Kumar Patra; Sumanta Haldar
Abstract This study investigates the effect of combined operational and seismic loads on the dynamic fore-aft, and the side-side response of monopile supported OWT in liquefiable soil under operational and parked conditions. A two dimensional (2 D) coupled soil-pile-structure interaction model is formulated in OpenSees, where the monopile and tower are modeled as Euler-Bernoulli beam elements, the
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Behavior of offshore dike using non-uniform geotextile mats on clay-overlaying-sand soil deposits Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-05 Mi Zhou; Huiqi Deng; Zejun Han; Xiaoliang Wang; Xihong Zhang; Huihui Zhao
Abstract This paper performs finite element (FE) analysis to investigate the behaviour of a large geotextile mat offshore dike on clay-overlaying-sand soil deposits, which is reinforced by a new type of non-uniform thick geotextiles technique. A FE model is generated and validated against laboratory centrifuge testing data. A comprehensive parametric study is then conducted to examine the influences
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Impact of salinity on strength and microstructure of cement-treated Champlain Sea clay Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-05 Moulay Youssef Monsif; Jinyuan Liu; Naresh Gurpersaud
Abstract An experimental investigation was conducted to understand the impact of salinity on the microstructure, phase composition, and shear strength of cement-treated Champlain Sea clay. Based on a scanning electronic microscopy (SEM) analysis, Champlain Sea clay exhibits an open structure fabric with flocculated particles. Leaching results in de-flocculation of the aggregates and leads to an increase
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Reliability analysis of laterally loaded piles in marine environments considering the degradation of flexural rigidity Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-11-05 Wei Shao; Yinghui Nie; Qiuhong Xu; Danda Shi
Abstract In this paper, the governing equation of chloride diffusion in reinforced concrete square piles is presented. The deterioration process of a pile caused by chloride-induced reinforcement corrosion is analyzed. The time-varying degradation coefficient of the flexural rigidity of piles induced by reinforcement corrosion is obtained. The time-varying failure probability and reliability index
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Improvement of soft clay by vacuum preloading incorporated with electroosmosis using electric vertical drains Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-29 Zhaohua Sun; Kai Yao; Chenjun Yang; Ming Liang
Abstract Vacuum preloading combined with electroosmosis (VE) has a good drainage effect, but electric vertical drains (EVDs) as the drainage plate and electrode will cause the offset of water flow near the anode. Therefore, there is an alternate time for the optimal use of the two methods. In this paper, some macroscopic indexes were monitored through laboratory tests to explore the optimal alternate
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Experimental study on the effect of temperature on marine clay consolidation with vertical sand drains Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-26 Qin-yang Sang; Yong-lin Xiong; Gan-bin Liu; Rong-yue Zheng
Abstract Based on a self-designed preloading consolidation model test system with vertical drains, saturated marine soft clay drainage consolidation and thermal drainage consolidation model tests were carried out at room temperature and high temperature, respectively. The variations in the soil temperature, excessive pore water pressure and surface subsidence over time were recorded in the tests. The
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Centrifuge modelling for seismic response of single pile for wind turbine subjected to lateral load Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-23 Bin Zhu; Xiaofeng Wu; Yubing Wang; Yanguo Zhou
Abstract The soil around the pile foundations of offshore wind turbines (OWTs) would suffer from earthquakes which are widely believed to undermine the bearing capacity and serviceability of foundations. The non-intermittent lateral environmental loads in the ocean (e.g., wave, wind, and current) continuously act on OWTs. However, the seismic response of pile foundations and the soil around is less
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Numerical and physical modeling of submarine telecommunication cables subjected to abrupt lateral seabed movements Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-19 Yu Wang; Cuiwei Fu; Xiaogang Qin
Abstract Submarine telecommunication cables, which carry about 99% of international telecommunications, are usually buried shallowly beneath seabed and vulnerable to seabed movements. In recent years, many submarine cable damages have been observed when significant lateral seabed movements occur due to geohazards, e.g., offsets of strike-slip faults and submarine landslides. However, research on the
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Illuminating centimeter-level resolution stratum via developed high-frequency sub-bottom profiler mounted on Deep-Sea Warrior deep-submergence vehicle Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-11 Xinghui Cao; Zhiguo Qu; Binjian Shen; Hanyu Zhang
Abstract Sub-bottom profiling traditionally uses low-frequency signals (less than 20 kHz) to examine layered structures of the bottom sediment in large depth, but it has some limitations in deep-sea surveying. The surficial sediment within several meters under the water–sediment boundary in the deep sea cannot be distinguished clearly. In this study, a high-frequency sub-bottom profiler (HFSBP) was
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Centrifuge modeling of batter pile behavior under explosion loading Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-07 Alireza Saeedi Azizkandi; Mohammad Hassan Baziar; Morteza Sabbaghi
Abstract This research aims to study the effect of pile arrangement and inclination on the bending moment of piles as well as the horizontal acceleration of the cap under explosion loadings. Data was obtained from five centrifuge tests, which were performed on a 2 × 2 pile group with various arrangements of vertical and batter piles. The results showed that among all the tested models, the pile group
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Recognition of cobalt-rich crusts based on multi-classifier fusion in seafloor mining environments Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-10-05 Gang Hu; Haiming Zhao; Fenglin Han; Yanli Wang
Abstract In seafloor mining environments, ultrasonic detection is often used for underwater target recognition, and a large number of suspended particles reduce the recognition rate of single-classifier cobalt-rich crusts. In this paper, we propose a recognition method based on multi-classifier fusion (MCF). First, the kernel Fisher discriminant analysis (KFDA) method is used to reduce the multi-class
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Closure to discussion “A review on the behavior of helical piles as a potential offshore foundation system” Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-25 Giovanni Spagnoli; Cristina de Hollanda Cavalcanti Tsuha
Abstract A closure on the recent discussion regarding the review on the behavior of helical piles as a potential offshore foundation system by the Authors is presented. Installation torque, uplift capacity, installation effects, model pile, installation speed and results proposed by Discussers are commented.
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Cyclic response of monopile-supported offshore wind turbines under wind and wave loading in sand Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-30 Rui Liang; Yu Yuan; Dengfeng Fu; Run Liu
Abstract Monopiles are popular solutions as the foundation to support offshore wind turbines (OWTs), which suffer from various amplitudes of continuous lateral cyclic wind and wave loading. The accumulation of tilt and change of the natural frequency of OWTs under cyclic loading have become crucial issues for OWT design. Hence the monopile-tower-soil system was established at the small-scale level
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3D coupled mechanical and hydraulic modeling of geosynthetic encased stone column-supported embankment over soft clay Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-29 Xu Zhang; Sathiyamoorthy Rajesh; Jian-Feng Chen; Zhen Zhang; Liang-Yong Li
Abstract Geosynthetic-encased stone column (GESC) has been proved as an effective alternative to reinforcing soft marine clay soils with low undrained shear strength. In this paper, three-dimensional (3-D) coupled mechanical and hydraulic modeling based on centrifugal model test was carried out to investigate the performance of GESC-supported embankment over soft clay with two different stiffness of
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Evaluation of grain size and content of nonplastic fines on undrained behavior of sandy soils Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-29 Ling-Yu Xu; Fei Cai; Jing-Zhe Zhang; Dong-Dong Pan; Qi Wu; Guo-Xing Chen
Abstract Marine sandy soils may liquefy under wave loading and/or seismic loading. Current research shows that the presence of fines can significantly affect the liquefaction potential of sandy soils. Thus, a quantitative evaluation of the effect of fines on the undrained behavior of sandy soils can provide useful information on soil liquefaction that can advance the design of foundations of coastal
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Liquefaction and post-liquefaction of granular material under multi-directional cyclic loading Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-29 Hanwen Zhang; Yunming Yang; Hai-Sui Yu
Abstract Soil liquefaction can be induced by natural events that entail complicated loading directions and magnitudes. To investigate the liquefaction behaviour of granular material under complex loading conditions, a series of strain-controlled cyclic simple shear tests are conducted on the uniform-sized glass beads. These tests include uni-directional and multi-directional loading paths. An energy-based
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Effects of cyclic wetting-drying on the mechanical behavior and improved damage model for sandstone Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-25 Xuewei Liu; Quansheng Liu; Shibing Huang; Bin Liu; Jiang Liu
The degradation of rock mechanical behavior after cyclic wetting and drying could affect the stability of rock slope, embankment, and tunnel significantly. A series of tests were first conducted on sandstone collected from a reservoir bank slope. The results showed that the mechanical parameters (including tensile strength, uniaxial compressive strength, elastic modulus, and internal friction angle)
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The optimal combination form of vacuum pre-loading combined with electro-osmosis and with dynamic compaction method on the improvement of dredged slurry Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-23 Xiuqing Hu; Ziyang Gao; Feiyu Liu; Yu Tao; Donghai Xu; Yunguo Du; Changfei Gou; Mingfeng Li
Aiming at the problems of soil column forming near the plastic vertical drains and soil cracking during electro-osmosis stage in the treatment of dredged slurry by vacuum pre-loading combined with electro-osmosis method, this paper proposed a new method, i.e. vacuum pre-loading combined with electro-osmosis and with dynamic compaction method. Through the laboratory model tests in self-made glass bucket
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Cyclic shear characteristics of marine cement soil under stress path with bidirectional shear stress Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-17 Yunguo Du; Ming Dai; Chaoliang Wang; Xiuqing Hu; Changfei Gou; Huan Wang
Under seismic loading, marine soil experiences horizontal shearing in two directions with different shear directions and amplitudes. It is therefore of considerable practical relevance to study the deformation behavior of marine cement soil under bidirectional shear loading. In this study, a series of cyclic simple shear tests were carried out to investigate the undrained deformation behavior of marine
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Combined stabilization/solidification and electroosmosis treatments for dredged marine silt Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-17 Shangqi Ge; Junchao Zang; Yunchao Wang; Lingwei Zheng; Xinyu Xie
Stabilization/solidification (S/S) has been examined as an effective way to strengthen soft soils. However, the presence of organic matter (OM) in dredged marine silt can substantially weaken the reinforcement effect of S/S. To treat organic silt that is difficult to strengthen by S/S, a new combined application of S/S and electroosmosis (EO) treatments was adopted in this paper to increase the strength
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The effects of initial deviatoric stress on anisotropy of marine clay and strain components Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-14 Heng Zhuang; Mingfeng Li; Chaoliang Wang; Lin Guo; Dikang Zhang; Hongke Du; Yunguo Du
This study investigated effects of initial deviatoric stress state and the orientation of their major principal stresses on the strain components and shear strength of soft marine clay. Hollow cylinder test results demonstrated that the axial and circumferential strain component magnitudes substantially depended on the initial deviatoric stress and the principal stress direction. The octahedral shear
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Behaviour of thick marine deposits subjected to vacuum combined with surcharge preloading Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-10 Dikang Zhang; Hongtao Fu; Jun Wang; Dongqi Zhu; Xiuqing Hu; Yunguo Du; Changfei Gou; Chaoliang Wang; Mingfeng Li; Hai Wu
This paper presents a case study on the improvement of thick marine deposits. A new method that combines vacuum pressure and surcharge load with no need for a sand cushion is proposed and evaluated. The main features of this method are as follows: (1) each integrated prefabricated vertical drain (PVD) is connected directly to a branch pipe, which is in turn connected to a main pipe with a T-shaped
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Testing thermodynamics method for salt intrusion during infrequent astronomical event Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-08 S. Haddout; K. L. Priya; B. Samad
Knowledge of the processes governing salt intrusion in estuaries is important since it influences the eco-environment of estuaries as well as its water resource potential in many ways. The aim of this paper is to test the effectiveness of the new 1-D thermodynamic salt intrusion equation proposed by Zhang and Savenije (i.e., is an extreme power theory for the mixing of saline sea water and fresh river
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Experimental study on the pressure of impulse waves generated by landslides on a bank slope Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-03 Ting Cao; Pingyi Wang; Jielong Hu; Zhenfeng Qiu; Pengchao He
Impulse waves generated by landslides lead to serious secondary disasters. To investigate the effects of impulse waves on a bank slope, a three-dimensional physical model test was conducted considering multiple factors, such as the width, thickness, and volume of the landslide body, inclination angle of the landslide, and bank slope angle. The results show that the wave did not break upon the first
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Stress state and noncoaxiality of Leighton Buzzard sand in NGI-type bi-directional simple shear tests Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-09-01 Yao Li; Yunfei Wu; Zhe Wang
In NGI-type simple shear apparatus, including recently developed NGI-type bi-directional simple shear apparatus, the complete stress state is unknown which limited the interpretation of test results. This study compares the stress state of NGI-type simple shear test obtained by two methods, the stress state determined by an empirical method using test data, and stress state determined by measured values
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Gas injection test of remolded saturated soil with consolidation Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-28 Yiping Zhang; Yongjin Chen; Huabin Lv; Mengxian Hu; Yongchao Zhou
Investigation of gas migration in saturated soil is of great theoretical and practical significance in marine science and engineering. The transport of gas bubbles in soil and its effects on soil physical and mechanical properties can be further studied. Gas injection and permeability tests were conducted using a self-developed oedometer with gas injection and water infiltration. Before the gas injection
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Closure to discussion “A review on the behavior of helical piles as a potential offshore foundation system” Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-25 Giovanni Spagnoli; Cristina de Hollanda Cavalcanti Tsuha
A closure on the recent discussion regarding the review on the behavior of helical piles as a potential offshore foundation system by the Authors is presented. Installation torque, uplift capacity, installation effects, model pile, installation speed and results proposed by Discussers are commented.
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Physical simulation of scour width and length variation around complex piers under clear water condition Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-24 Valeh Khaledi; Ata Amini; Jamil Bahrami
The use of complex piers to build bridges has become widespread. In this study the experimental data was obtained to determine scour hole's dimension and its changes versus pile cap elevation. Five models with different geometry were used in experiments under clear water condition and thresholds velocity. The models were made with an appropriate scale from real piers of bridges. A 3D illustration of
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Bearing behavior and earth pressure distribution for modified suction caissons in sand under inclined loading Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-19 Yun Bai; Dayong Li; Yukun Zhang; Dawei Mao
Model tests accompanying numerical analyses on the modified suction caissons (MSCs) in saturated marine sand subjected to inclined loading were conducted to investigate the bearing behavior and earth pressure distribution along the embedded depth. Influences of external structure sizes, inclined loading angles and loading point position on the inclined bearing behavior were discussed. Results show
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Effects of cement content and curing period on strength enhancement of cemented calcareous sand Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-13 Jianxiao Gu; Chao Zeng; Haibo Lyu; Junyan Yang
Cement treatment is a promising and effective method to enhance strength of calcareous sand in regions where offshore foundations and coastal facilities are localized. In treatment, the added cement content and curing period influence the strength of cemented calcareous sand. In order to regulate the loading resistance of cemented calcareous sand, effects of cement content and curing period on strength
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Calculation of monopile foundation in sand to long-term lateral cyclic load Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-11 Chenrong Zhang; Feng Yu; Maosong Huang; Zhiqi Zhu
Monopiles are widely used to support the upper structures of wind turbines in offshore engineering. Due to harsh environmental conditions, they are subjected to long-term lateral cyclic loading from waves and winds during the design life. A robust beam on the Winkler foundation model is presented to analyze the responses of monopile foundation under long-term lateral cyclic load, incorporating cyclic
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Optimization design of a honeycomb-hole submarine pipeline under a hydrodynamic landslide impact Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-10 Xing-sen Guo; Ting-kai Nian; Ning Fan; Yong-gang Jia
Submarine pipelines are likely to be impacted by frequently catastrophic landslides, resulting in broken pipelines and causing irreversible economic losses; however, because pipelines located in deep-sea environments are simply laid atop the seabed, effective protective measures have not yet been proposed. In this paper, a pipeline with a uniform distribution of honeycomb holes on the surface, namely
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Experimental study on integrated and autonomous conductivity-temperature-depth (CTD) sensor applied for underwater glider Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-08-05 Bin Lv; Hai-lin Liu; Yi-fan Hu; Cheng-xuan Wu; Jie Liu; Hai-jing He; Jie Chen; Jian Yuan; Zhao-wen Zhang; Lin Cao; Hui Li
This paper studies a novel CTD sensor (SZQ1-1) which is developed for underwater glider to meet the requirement of autonomous acquisition of high-quality profile hydrodynamic oceanography data. An independently developed electromagnetic induction type conductivity sensor, a quick response thermistor and a high-precision pressure sensor is used to integrate the CTD sensor. Several designs of compact
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Hydrodynamic performance of tire-based floating breakwater Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-22 Ahmad AlYousif; Subramanaim Neelamani; Arnoldo Valle-Levinson
The hydrodynamic characteristics (wave transmission, reflection, and dissipation) of nine different scrap-tire floating breakwater configurations are studied in a wave flume for a wide range of input wave conditions. The breakwater has 3 different configurations: a) four and b) eight rows of tires as well as c) four rows in two levels. The effect of these configurations is assessed on the hydrodynamic
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Characterization and prediction for the strength development of cement stabilized dredged sediment Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-22 Xiao Cheng; Yonghui Chen; Geng Chen; Bingyi Li
Cement stabilized clay (CSC) from dredged sediment or sludge is receiving increasing attention for its use as construction material. In this paper, seven CSC mixture samples were tested to investigate the effect of constituent proportion parameters and curing time (T) on strength characteristics. Results illustrate that clay-water/cement ratio (W/C) is significantly related to the unconfined compression
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Discussion: A review on the behaviour of helical piles as a potential offshore foundation system Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-16 Shah Neyamat Ullah; Yuxia Hu
Abstract Helical piles have emerged as an attractive foundation system for offshore applications with renewed interest from the offshore community. Significant research gap currently exists in transferring this technology offshore and this paper discusses how existing and emerging knowledge can be successfully used to bridge some of the gaps. We focus on the Coupled Eulerian Lagrangian (CEL) large
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The influence of organic matter on the strength development of cement-stabilized marine soft clay Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-15 Chuanxin Du; Jinli Zhang; Gang Yang; Qing Yang
The organic matter within clay soil is one of the important factors affecting its engineering characteristics. In this study, the influence of organic matter on the strength evolution of cement-stabilized marine soft clay is evaluated by scanning electron microscopy (SEM) and unconfined compressive strength (UCS) testing. The experimental results show that the after-curing clay water content of the
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Unique determination of cyclic instability state in flow liquefaction of sand Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-11 Xueqian Ni; Bin Ye; Guanlin Ye; Feng Zhang
Flow liquefaction is a catastrophic failure phenomenon of loose sand when subjected to wave or seismic load, and an instability state can be regarded as the onset of flow liquefaction. Most of the previous studies focused mainly on the static instability state, while the investigations on cyclic instability state (CIS) are very limited and unsystematic. The characteristics of CIS are complex and there
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Finite elements method based on Galerkin’s formulation for predicting the sand bars position Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-07 I. López; J. I. Pagán; F. J. Navarro-González; Y. Villacampa; G. Hernández; L. Aragonés
The accurate knowledge of the location and movement of the sand bars is important for the coastal manager to establish correctly the coastal defence elements. This work applies a numerical model of finite elements based on Galerkin's formulation for predicting the location of the start, crest and end of the outer bar. The model that shows the best results is the one that combines the variables wave
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Critical state elastoplastic constitutive model of angular-shaped and fragile granular materials Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-03 Mingxing Luo; Jiru Zhang; Xiaoxuan Liu; Duanduan Xu
Fragile angular-shaped granular materials, such as calcareous sand, rockfill material, and ballast, show complex stress–strain–volumetric relationships due to the effects of particle breakage. This paper presents a proposed constitutive model to simulate the effects of particle breakage on the mechanical response of calcareous sand and rockfill materials in drained triaxial tests previously conducted
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Flocculant effects on fluidity and strength behavior of cemented dredged clay with high water content Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-07-03 Gui-Zhong Xu; Cheng-Chun Qiu; Miao-Miao Song; Yu-Peng Cao; Jie- Yin
The dredged clay (DC) could not be directly reutilized for its extra-high water content. So, the dewatering is needed before further improvement. At present, the commonly used self-weight sedimentation and natural air-drying are often difficult to meet the engineering requirements and time-consuming, thus chemical flocculants are used to improve the dewatering process for their excellent flocculation
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An integrated approach of fluid contact determination of the Albian age sandstone reservoirs of the Orange Basin Offshore South Africa Mar. Georesources Geotech. (IF 1.716) Pub Date : 2020-06-30 Mimonitu Opuwari
The Orange Basin situated offshore South Africa has been subject to various studies as it is gas prone, but limited literature exists on the determination of fluid contacts. The availability of well logs, repeat formation tests (RFT), and drill stem test (DST) results make the Orange Basin an ideal example to carry out studies on the integration of these data to understand the fluid contacts in the
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