Study on the mechanical properties of outwash deposits with random structure method  

作　　者：Chaojun Jia Qiang Zhang Mingfeng Lei Jun Yu Rubin Wang Jingyan Liu 

机构地区：[1]School of Civil Engineering,Central South University,Changsha,410075,China [2]State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources,Beijing,100048,China [3]China Institute of Water Resources and Hydropower Research,Beijing,100048,China [4]School of Transportation and Civil Engineering,Nantong University,Nantong,226019,China [5]Research Institute of Geotechnical Engineering,Hohai University,Nanjing,210098,China [6]College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan,030024,China

出　　处：《Transportation Safety and Environment》2021年第3期316-330,共15页交通安全与环境（英文）

基　　金：supported by the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin(China Institute of Water Resources and Hydropower Research),Grant No.IWHRSKL-KF202016;Natural Science Foundation of Hunan Province(CN),Grant No.2020JJ5732;National Natural Science Foundation of China(Grant No.51679069);National Key R&D Program of China,Grant No.2017YFC1501100;Open Fund of State Key Laboratory of Hydraulics and Mountain River Engineering(Sichuan University),Grant No.SKHL1725;Water Conservancy Science and Technology Research and Extension Project of Shanxi Province,Grant No.2021LS034.

摘　　要：Outwash deposit is one of the major threats to the safety and stability of railway transit engineering in the Sichuan–Tibet area.In this paper,different samples of outwash deposits were prepared based on the random structure method,and a series of large-scale direct shear tests were carried out under different normal stresses.The influence of stone content and the spatial distribution of stone blocks on the physical and mechanical properties of outwash deposits were studied.The results show that with the increase of stone content,the shear stress-displacement curve changs from strain softening to strain hardening.The shear zone is larger,and its shape is more tortuous due to the movement and rotation of stone blocks.The internal frictional angle increases linearly while the cohesion diseases with the increase of stone content.The main influence of the spatial distribution of stone blocks on the mechanical properties of outwash deposits is the peak stress.The shear zone is mainly determined by the distribution of the stone blocks near the shear zone.

关 键 词：outwash deposit mechanical property random mesostructure discrete-element method direct shear test 

分 类 号：P61[天文地球—矿床学]