边坡稳定性的等效塑性应变熵评价方法及工程应用

岩土体边坡是一个开放的、耗散的系统，边坡滑动失稳即为重力或外力或环境变化等作用下滑动体由静止开始运动直到破坏，即为由无序向有序的发展过程。本文基于信息熵理论，建立了边坡滑动变形过程中的等效塑性应变熵值方程，通过对实际边坡变形发展过程中等效塑性应变熵值进行计算分析得到，稳定边坡的熵值随时间逐渐增大，无下降段；滑动边坡的熵值随着滑坡的发展呈现先增后减最终稳定的变化规律，分别对应边坡土体单元塑性应变总体增加、塑性应变在滑动面附近逐渐集中、边坡滑动三个阶段，由此可对边坡所处状态作出评判；也为边坡稳定性判定提供了一种新思路。

EQUIVALENT PLASTIC STRAIN ENTROPY METHOD OF SLOPE STABILITY ASSESSMENT AND ITS APPLICATION

soil slope is an open dissipative system, and slope failure is a set of soil motion by gravity, external forces or changes of mechanical environment. That is the evolution from chaos to order. In this paper the information entropy based on equivalent plastic strain of slope evolution is achieved through numerical simulation of large deformation. Study shows that the entropy of stable slope is general increase as the slope evolution, and entropy of instable slope has 3 stages in which the entropy increase firstly then decrease and finally be approximately stable. The 3 stages are the pointer of slope evolution contains stage of plastic strain appears and grow, stage of plastic strain zones cutting-through and stage of landslide. Equivalent plastic strain entropy method provides a new way of numerical standard of slope stability assessment.