岩土力学2017，Vol.38Issue(9)：2728-2736,9.DOI:10.16285/j.rsm.2017.09.034
考虑环境劣化非贯通节理岩体的直剪试验离散元模拟
Discrete element simulation of direct shear test on rock mass containing discontinuous joints with environmental degradation
摘要
Abstract
The strength property of the intermittent jointed rock mass is an important factor which affects the safety of large slope and tunnels.With the increasing degree of environmental degradation induced by the acid rain,pollution and other factors,it is necessary to study its influence on the mechanical properties of intermittent jointed rock mass.Based on the existing bond contact model,a novel bond contact model,in which the process of environmental degradation was simplified ultimately as the constantly dissolution of bond between the particles,was established and implemented into a commercial distinct element code.Then,a series of direct shear tests with different connectivity rates and normal stresses under various degree of environmental degradation was conducted in DEM.The results imply that there is a similar tendency of shear stress-displacement curves obtained from intermittent jointed rock mass samples with varying degree of environmental degradation.And with the increasing of environmental degradation degree,the main failure mode of intermittent jointed rock mass changes from tensile crack to shear crack.In addition,the initiation stress,the cohesion and internal friction angle of non-penetrating jointed rock mass are reduced with the increasing of environmental degradation degree.关键词
环境劣化/非贯通节理岩体/直剪试验/离散元模拟Key words
environmental degradation/intermittent jointed rock mass/direct shear test/DEM simulation分类
建筑与水利引用本文复制引用
蒋明镜,刘蔚,孙亚,张宁,王华宁..考虑环境劣化非贯通节理岩体的直剪试验离散元模拟[J].岩土力学,2017,38(9):2728-2736,9.基金项目
国家重点基础研究发展规划(973)项目(No.2011CB013504,No.2014CB046901) （973）
国家杰出青年科学基金(No.51025932).The research was supported by the Key Basic Research Project of China (973 Program) (2011CB013504,2014CB046901),the National Science Foundation for Distinguished Young Scholars (51025932). （No.51025932）
