堆积体边坡渐进性破坏的随机模型  

A Stochastic Model for Progressive Failure of Accumulation Slope

作　　者：谢山立 袁广祥[2] 

机构地区：[1]河南省地矿建设工程(集团)有限公司总工办 [2]华北水利水电学院资源与环境学院

出　　处：《中国安全科学学报》2011年第9期16-21,共6页China Safety Science Journal

基　　金：国家自然科学基金资助(40972199);华北水利水电学院高层次人才科研启动项目(200919)

摘　　要：为精确模拟堆积体边坡变形破坏过程,根据堆积体所固有的非连续性、非均质性、各向异性等特点,以及边坡变形破坏的渐进性特征,采用改进的有限单元法(FEM)对堆积体边坡进行模拟。考虑堆积体边坡从连续位移函数到不连续位移函数的突变。破裂发生前,用连续位移函数进行计算;破裂发生后,引入不连续位移函数。研究结果表明,破裂面上不同点的安全系数(FOS)是不同的,但都随着破坏过程而降低。同时,可以得出不同非均匀程度下安全系数的概率分布。It is very difficult to simulate accurately deformation and failure of slope,especially accumulation slope,because of the inherent discontinuity,in-homogeneity and aeolotropism properties of accumulation and progressive failure of slope.Therefore,a modified FEM is used for accurate simulation of deformation and failure of slope.The new numerical approach considers the sudden transition of continuous displacement function to the discontinuous displacement function.Continuous displacement functions are used until the occurrence of fracture.After the fracture,fractured edge is changed into the traction free boundaries,thus introducing the elegant way of consideration of discontinuous displacement functions.The study results indicate that the FOS does not remain constant at different points through out the failure surface,but decreases with progressing failure.After calculation,the probability distribution function of FOS could be obtained for various degrees of material heterogeneity.

关 键 词：堆积体边坡 渐进性破坏 随机模型 有限单元法(FEM) 位移函数 

分 类 号：X913.4[环境科学与工程—安全科学]