The Study on Selection of Evaluation Criterion for Slope Instability

Abstract

How to select an appropriate instability evaluation criterion is a key issue in the application of the finite element strength reduction method. Commonly used evaluation criteria for slope instability mainly include non-convergence criterion of finite element numerical calculation, displacement saltation criterion at characteristic point, and penetration criterion of plastic zone. The researches on these three types of instability criteria are still continuing, but there is no uniform conclusion yet. Based on the different characteristics of the three types of instability evaluation criteria, this paper compares and analyzes the evaluation results of three criteria on the slope stability by trial calculations, and then discusses the characteristics and effectiveness of three types of instability evaluation criteria. In actual numerical calculation, it is necessary to minimize the influence of human factors and comprehensively consider the three types of instability evaluation criteria to improve the consistency of the evaluation results. when the evaluation results are inconsistent, priority should be given to the feature point displacement saltation criterion at characteristic point or penetration criterion of plastic zone. In addition, a reasonable dilatancy angle is needed to accurately consider the influence of dilatancy on slope stability.