两种应变软化介质组成的边坡失稳研究  

Research on instability of slope composed of two strain-softening media

作　　者：孙强[1] 胡秀宏[1] 王媛媛[1] 李曼[1] 

机构地区：[1]中国科学院地质与地球物理研究所工程地质力学重点实验室,北京100029

出　　处：《岩土力学》2009年第4期976-980,共5页Rock and Soil Mechanics

基　　金：中国科学院知识创新工程重要方向项目资助(No.kzcx2-yw-113)。

摘　　要：对一个平面滑动型边坡,考虑滑面介质由两种应变软化介质材料组成,对应变软化介质存在损伤软化与水致软化两种软化方式。用指数分布描述滑带介质的剪应力与应变关系,建立了边坡系统的尖点突变模型。通过分析发现,边坡失稳与刚度比和边坡的几何/力学参数有极大关联性,这里考虑刚度比是含水率的函数,随着含水率的增加,刚度比不断发生变化。在一定条件下,由于含水率的增加和刚度比的增大,导致边坡失稳的危险性增大,这是降雨情况下边坡容易失稳的根本原因。The instability of slope which consists of two strain-softening media is analyzed. The sliding surface is assumed to be planar. There are two factors, which are water and strain, for considering damage soften of the media. The shear stress-strain constitutive relation ship is described by the index distribution law. In this way, a cusp catastrophe model of slope system is established. Through the analytical result, it is discovered that the slope stability has close relation with the stiffness ratio k of medium 2 to medium 1, and the water content of sliding surface medium. Under some specific condition, it finds that with the increase of water content, which results in the change of stiffness ratio k, especially under the condition of rainfall, the landslide is easy to lose its stability.

关 键 词：尖点突变 失稳 刚度比 水致软化 

分 类 号：TU753.8[建筑科学—建筑技术科学]