Research on Numerical Direct Shear Test of Soil-Rock Mixture Based on Particle Flow Code Simulation

被引：0
|
作者：
Zhang Z. [1 ,2 ]
Sheng Q. [1 ,2 ]
Fu X. [1 ]
Luo H. [3 ,4 ]
Dan L. [3 ,4 ]
机构：
[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan
[2] School of Engineering Science, University of Chinese Academy of Sciences, Beijing
[3] Yunnan Dayong Highway Construction Company Limited, Dali
[4] Yunnan Communications Investment & Construction Group CO., LTD, Kunming
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2021年 / 29卷 / 01期
关键词：
Deformation characteristic; Direct shear test; Mechanical property; Particle discrete element method; Random irregular rock; Rock content; Soil-rock mixture(SRM);
D O I：
10.16058/j.issn.1005-0930.2021.01.012
中图分类号：
学科分类号：
摘要：
Soil-rock mixture(SRM) is a typical heterogeneous and discontinuous material, whose mechanical properties are influenced by soils, rocks and interfaces of two components. In order to analyze the influence of rocks and soils on SRM mechanical behaviors and deformation, irregular clumps are generated using particle flow theory and particle flow code(PFC2D) to describe rock in this study. The discrete element model of SRM for the direct shear test is built and laboratory direct shear test results are used in mesoscopic parameters calibrations. According to the definition of "clump" in PFC2D code, SRM samples of certain rock contents could be simulated and numerical direct shear tests with different rock contents and different inter-element bonding strengths between soil particles are performed. The results show that the simulated shear strengths and strength parameters are in accordance with actual laboratory test results, which prove the reliability of the random rock block generation model and meso-parameters. The shear strength increases with rock block content increasing while the shear displacement at the peak shear stress decreases. Under the higher rock content the cohesion increases to the peak value and then sags. The cohesion starts to rise again when rocks become the structural skeleton of SRM samples. The shear dilatancy occurs due to the uneven shear plane and dilatancy deformation becomes much larger in the higher rock content in SRM samples. As the inter-element bonding strength increasing, the peak shear stress and corresponding shear displacement keep increasing. The stress volatility and shear dilatancy are more apparent in SRM samples with a higher inter-element bonding strength. © 2021, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：135 / 146
页数：11
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