恒定法向刚度边界条件下岩石节理剪胀特性数值模拟  

Numerical simulation of shear dilation characteristics of rock joints under constant normal stiffness boundary conditions

作　　者：吴家红 刘杰 宋彦彬 WU Jiahong;LIU Jie;SONG Yanbin(School of Civil Engineering,Shaoxing University,Shaoxing 312000,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing 312000,China;Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards,Shaoxing 312000,China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000 [3]浙江省山体地质灾害防治协同创新中心,浙江绍兴312000

出　　处：《采矿与岩层控制工程学报》2022年第2期67-77,共11页Journal of Mining and Strata Control Engineering

基　　金：浙江省山体地质灾害防治协同创新中心开放课题资助项目(PCMGH-2017-Y-04)。

摘　　要：恒定法向刚度边界条件下的节理剪胀特性对于深部地下工程岩体稳定性至关重要。利用UDEC软件,基于连续屈服微段节理模型,构建恒定法向刚度边界条件下岩石节理剪切离散元计算模型,探讨恒定法向刚度边界条件下岩石节理的剪胀效应。结果表明:岩石节理剪胀段的剪胀位移呈负指数增长;岩石节理的最大剪胀位移与最大起伏高度呈正相关关系,与初始法向应力和法向刚度呈负相关关系;岩石节理剪胀收敛速率随着初始法向应力和法向刚度的增大而增大;通过对岩石节理的宏观剪胀数值曲线的分析,提出适用于恒定法向刚度边界条件的考虑节理的最大起伏高度、凸起体倾角、法向刚度和初始法向应力的岩石节理非线性剪胀模型,通过剪胀理论曲线和数值试验曲线的对比,表明该模型具有较好的普适性。Understanding the shear dilation of rock joints under constant normal stiffness boundary conditions is crucial for the stability of deep underground engineering rock mass. In this paper,the UDEC software was used to construct a discrete element calculation model for rock joints under constant normal stiffness boundary conditions based on a continuously-yielding micro-segment joint model. The dilation effect of rock joints was discussed. The results show that the dilation displacement of rock joints dilation shows a trend of negative exponential growth under constant normal stiffness boundary conditions. The maximum dilation displacement of rock joints is positively correlated with the maximum undulation height of rock joints and negatively correlated with the initial normal stress and normal stiffness. The dilation convergence rate of rock joints increases with the increase of initial normal stress and normal stiffness. Through the analysis of shear dilation numerical curves of rock joints,a nonlinear dilation model under constant normal stiffness boundary condition considering the maximum height fluctuation of the joint surface,asperity dip angle and initial normal stress was proposed. The comparison of the dilation theory curves and the numerical test curves,shows that the model has good universality.

关 键 词：恒定法向刚度 岩石节理 剪切 剪胀模型 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]