基于离散元法的节理岩体边坡稳定性分析  

Stability analysis of jointed rock slopes based on discrete element method

作　　者：贺续文[1,2] 刘忠[1,2] 廖彪[1,2] 王翠翠[1,2] 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]湘潭大学流变力学研究所,湖南湘潭411105

出　　处：《岩土力学》2011年第7期2199-2204,共6页Rock and Soil Mechanics

摘　　要：节理岩体边坡的稳定性在很大程度上取决于节理的强度及其分布形式。由于节理岩体边坡的失稳破坏具有大变形和非连续的特点,因此,离散单元法成为研究节理岩体边坡破坏机制的最有效方法之一。通过采用离散元软件PFC2D进行数值模拟,对完整岩石及节理的力学性能进行研究,并建立含密集节理的岩体边坡模型,讨论了节理连通率对边坡破坏形式的影响。结果表明,节理岩体边坡的失稳破坏是一个渐进的过程;在多组节理密集分布的岩体边坡中,连通率越大,其稳定性越差;随着连通率的减小,边坡的破坏形式由大范围的滑坡转变为局部崩塌的形式。The stability of jointed rock slope is mainly controlled by the shear strength and distribution of joints. The failure of jointed rock slopes usually has large deformation and discontinuous features; therefore, discrete element method becomes an efficient way for stability analysis of jointed rock slopes. A general study of the intact rock properties and mechanical characteristics of joints are carried out using the particle flow code in two dimensions （PFC2D）; and a heavily jointed rock slope is modeled using PFC2D to study the slope stability. The results reveal that the failure of jointed rock slopes is a gradual process; the joint connectivity has large effect on the stability of rock slopes with heavily joints; when the joint connectivity is more higher, the slope is more unstable; with the decrease of joint connectivity, the slope failure modes will change from the large scale slide into a partially collapsed form.

关 键 词：节理 岩体边坡 离散元法 节理连通率 滑坡 

分 类 号：TU457[建筑科学—岩土工程] O158[建筑科学—土工工程]