计算边坡安全系数的坡向离心法

Slope centrifugal method for calculating safety factor of slope stability

边坡稳定分析方法发展最引人注目,它是经典土力学最早试图解决而至今仍未圆满解决的课题。在常用边坡分析方法的基础上,从边坡失稳机制出发,提出一种更方便的安全系数计算方法——坡向离心法。该法通过不断增大水平加速度,直至边坡失稳为止,依据水平加速度与重力加速度失稳影响机制求得安全系数。通过算例与传统极限平衡法和有限元强度折减法相比较,并对各物理参数进行敏感性分析。结果表明,坡向离心法在边坡工程稳定分析中的应用是切实可行的,其弹性模量和泊松比对该法所求安全系数影响不大。

Much attention has been paid to the development of the analysis method for slope stability, which is an unsolved problem in the classical soil mechanics till now. Based on the previous analysis methods and slope failure mechanism, a convenient approach, slope centrifugal method, is presented to calculate the safety factor of slope stability in the current work. In detail, the horizontal acceleration is applied on a slope and the value of the acceleration increases until that the slope failure happens. The safety factor can be obtained considering both of the centrifugal and the gravity on the failure slope. The comparisons between the presented method and the previous methods, e.g. the traditional limit equilibrium method and the finite element intensity discount method, is given by an example; and the sensitivity analysis of various physical parameters is given to show the validity of the presented method for analysis of slope failure. Results also show that the safety factor obtained by the presented method depends on the elasticity of the material in slope, slightly.