非饱和土边坡稳定分析方法探讨  

Discussion on stability analysis of unsaturated soil slopes

作　　者：李荣建[1] 于玉贞[1] 邓丽军[1] 李广信[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室(筹),北京100084

出　　处：《岩土力学》2007年第10期2060-2064,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金与长江水利委员会联合资助项目(No.50099620)

摘　　要：在对非饱和土边坡进行稳定分析时,应该全面地考虑基质吸力对边坡稳定的贡献。首先,分别探讨了基于Fredlund非饱和土强度表达式和Bishop非饱和土有效应力强度公式将强度折减有限元法推广到非饱和土边坡稳定分析中的具体方法;然后,开发了可以考虑基质吸力两种处理方法的强度折减有限元计算程序;最后,给出了一个非饱和土边坡稳定分析的对比算例,说明了二者的不同特点。The contribution of matric suction to the stability of unsaturated soil slope should be properly evaluated in order to meet the demand of practice. Firstly, Bishop＇s and Fredlund＇s strength equations for unsaturated soil are discussed, respectively. Then the strength equations expressed in three-dimensional effective stress space are applied to the strength reduction finite element method and the treatments of the matric suction are discussed. Finally, the FEM codes are implemented and a case of unsaturated soil slope stability is analyzed.

关 键 词：非饱和上 基质吸力 边坡 稳定性 强度折减有限元法 

分 类 号：TU432[建筑科学—岩土工程]