基于位移突变判据的强度折减法边坡稳定分析  

Stability Analysis of Slope by Using Strength Reduction FEM Based on the Criterion of Uncontrolled Displacement at Three Characteristic Nodes

作　　者：李亚生[1,2,3] 周翠英[1,2] 张惠明[2] 

机构地区：[1]中山大学工学院,广东广州510275 [2]中山大学岩土工程与信息技术研究中心,广东广州510275 [3]中水珠江规划勘测设计有限公司,广东广州510610

出　　处：《人民黄河》2012年第2期146-148,共3页Yellow River

基　　金：国家自然科学基金重点项目(41030747);国家自然科学基金面上项目(40672194);国家"863"计划项目(2007AA11Z112)

摘　　要：通过对有限元强度折减法失稳判据的探讨得出,相对于塑性应变贯通和不收敛判据,位移突变判据更符合边坡失稳机理,提出了基于三点位移突变判据为主,结合位移云图及塑性变形综合判定边坡稳定性的有限元强度折减法。确定了位移突变标准的两个关键点,并指出参考的位移比值应取"纯"滑坡位移比值,该值越大,边坡滑动幅度越大,边坡向危险滑动状态变化。The criterion of uncontrolled displacement at a certain characteristic node was considered to explain slope failure better than those of connectivity of plastic zone and iteration non-ennvergenee of nonlinear FEM numerical calculations by discussing the failure criteria of strength reduction finite element method. The strength reduction finite element method of slope stability mainly based on the criterion of uncontrolled displacement at three charaeteristic nodes with that of results nephogram and plastic deformation was put fnrward. The two key points of criterion of uncontrolled dis- placement was confirmed, and the referenced displacement ratio should be pure displacement ratio of slope. When the ratio is big, the degree of slope slip is greater and the slope inclines to dangerous sliding state.

关 键 词：有限元强度折减法 失稳判据 位移突变 边坡 

分 类 号：TU433[建筑科学—岩土工程]