基于强度折减法的边坡安全预警及失稳判据研究

Research on Security Warning and Instability Criterion of Slope Based on Strength Reduction Method

传统强度折减法难以对实际边坡失稳进行动态预测或预警。基于边坡失稳变形的演化规律,获得边坡特征点位移量与稳定状态的关系。利用强度折减法对边坡强度进行逐步折减,进而构建边坡折减系数与特征点位移间关系曲线,结合边坡失稳演化规律,以特征点处位移值的突变作为边坡失稳判定依据,提出一种边坡失稳预警位移值和极限位移值的确定方法,实现了对边坡安全性进行预测预警。

Dynamic forecasting and early warning of slope instability can not be realized by using the traditional strength reduction method. Relationship between deformation of feature point and stability of slope is obtained based on evolutional law of slope instability. Relation curve of reduction factor and feature point displacement is built according to strength reduction method. Combining with evolution law of slope instability, the sudden change of displacement value at characteristic point is taken as the criterion to judge slope instability, and then, the warning displacement value and ultimate displacement value of slope instability have been put forward and defined by a determined method. Forecasting and early warning of slope safety is achieved.