关键词: 边坡, 算法, 强度各向异性, 数值应力场, 临界滑动面, 临界坡高

Abstract: In this paper, an analysis algorithm which can be used to determine critical sliding surface and critical height of slope, based on numerical stress field, is presented. Upon the algorithm, firstly, the stress field of slope can be obtained by using the finite element analysis method to get more accuracy. Secondly, through simulation of slope, the laws of generation and movement of particles similar to the process of chain reaction are studied. Finally, the critical sliding surface can be determined. Therefore four conclusions can be drawn: (1) A method for determining the critical sliding surface of slope on account of numerical stress field is proposed, which can find potential failure path while no disturbance of the shape and location of slope sliding surface. (2) By controlling such four factors as range and boundary, excitation source, diffusion path and path metrics, the algorithm can get higher accuracy and simultaneously higher efficiency. (3) The algorithm takes the effect of strength anisotropy on stability of slope into consideration. And it is valid to compute the critical slope height. (4) A detailed calculation example has verified the proposed algorithm. Compared to calculation results obtained by the two methods of PSO and Monte Carlo, the reliability of the algorithm could also be proved.

Key words: slope, algorithm, strength anisotropy, numerical stress field, critical sliding surface, critical slope height