断续节理岩体随机模型三维离散元数值模拟  

STOCHASTIC MODELAND NUMERICAL SIMULATION FOR DISCONTINUOUS JOINTED ROCK MASS USING 3D DEM

作　　者：汪远年[1] 李世海[1] 

机构地区：[1]中国科学院力学研究所,北京100080

出　　处：《岩石力学与工程学报》2004年第21期3652-3658,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2002CB412703);中国科学院创新项目(KJCX2-SW-L1)资助课题。

摘　　要：针对断续节理岩体提出了一种随机计算模型。在该模型中,假设结构面的形状为正方形,通过岩体结构面的统计分布函数模拟结构面的空间随机分布。给出了随机节理模型的实现方法,对该随机模型的算法可靠性进行了验证。通过单向加载模拟试验研究了节理岩体破坏强度与节理倾角及节理连通率等因素的关系,并与极限平衡条件推导的理论结果进行了比较,分析了数值模拟结果与极限平衡理论结果的异同性,进而验证了节理随机计算模型的可靠性。同时,研究了节理连通率与岩体等效弹性模量之间的影响关系,给出了二者的影响关系式。A stochastic model for discontinuous jointed rock mass is presented. In the model, according to the statistical distribution function of structural surface, the spatial stochastic distribution of structural surface is simulated on the assumption that the shape of structural surface is square. The implementation approach and algorithmic reliability of the stochastic model are revealed. Through uniaxial compression simulation, the relation between strength of jointed rock mass and its influence factors such as joint obliquity and connection rate is studied under one set of diagonal joints. The computational results are compared with the theoretical value which is deduced through limit equilibrium condition to validate the stochastic joint model, and the similarities and differences between them are analyzed. Also the relationship between equivalent elastic modulus of discontinuous rock mass and connection rate of joint is studied with their influencing relation presented.

关 键 词：节理岩体 三维离散元 极限平衡条件 极限平衡理论 岩体结构面 计算模型 加载 随机模型 连通 随机分布 

分 类 号：O174[理学—数学] TU452[理学—基础数学]