三维块体元塑性极限分析下限法  

Three-dimensional block elements plastic lower bound limit analysis method for slope stability

作　　者：陈炜 李泽[2] 王均星[3] 罗贝尔[3] 

机构地区：[1]福建省水利规划院,福州350001 [2]昆明理工大学工程力学系,昆明650051 [3]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《岩土力学》2010年第11期3645-3650,共6页Rock and Soil Mechanics

基　　金：教育部科学技术研究重点项目(No106107);云南省应用基础研究计划项目(No2008ZC028M);昆明理工大学校人才培养基金(No校2008-061)

摘　　要：基于块体元离散思想,将三维边坡离散为块体-结构面组成的块体系统,假定块体为刚体,以结构面上的应力为未知量;从下限定理出发,构造满足平衡条件、边界条件和屈服条件的静力许可场,平衡方程严格满足3方向力平衡及绕3个主轴方向的力矩平衡条件,为避免非线性规划,对屈服条件进行线性化处理;最后,建立了下限法数学规划模型,通过线性及非线性规划获得边坡稳定严格的下限解。用几个典型算例验证了文中方法的正确性及可行性。By using the discrete means of the block element method,the 3D slope is partitioned into a proper number of block elements conjoined with the structural planes.It assumes block elements are rigid,stresses only existed in structural planes.Base on the lower bound limit theorem,and regarding the stresses of structural plane as unknown variables,the statically admissible stress fields that satisfy the equilibrium,boundary conditions and yield criterions are constructed.A linearization yield criterion is used for avoiding nonlinear mathematical programming.Finally,the lower bound limit analysis model of linear and nonlinear mathematical programming for 3D slope stability is established;four examples are used and the results agreed well with those from the rigid limit equilibrium and upper bound method.

关 键 词：三维边坡稳定 下限法 块体元 安全系数 数学规划 

分 类 号：TU473[建筑科学—结构工程]