极限平衡理论下边坡强度参数反演及加固稳定性分析

摘要

参数反演是获得较为可靠的边坡强度参数的一种有效手段.本文在对边坡临界滑动面进行判别的情况下,以瑞典法为基础,通过建立强度参数之间及其与临界滑动面一一对应的关系推导得边坡强度参数反演的显式计算公式.然后,将反演结果用于锚索加固条件下的边坡稳定性研究.经工程算例分析验证了本文方法的可行性和实用性,并得到如下结论:(1)预应力锚索能对边坡形成有效的加固作用,且锚索在坡面上的位置越靠近滑动面的滑出点时其对边坡的稳定性越有利;(2)锚索的预应力越大则计算得到的安全系数越大,而锚索水平倾角的增大对计算得到的安全系数影响微小.%Parameter inversion is an effective way to obtain more reliable strength parameters of slope.In the article,after discriminating the position of the critical slip surface,the explicit formulas for inversion of strength parameters are deduced by the established relation between strength parameters and one to one relationship among strength parameters,and the critical slip surface.The classical Swedish slice method is used for calculating the factor of safety.Then,the inversion results are used to study the stability of slope reinforced by anchorage cable. Through analyzing actual case,the feasibility and practicability of the current method are verified.Some conclusion are obtained as follows:(1)Pre-stress cable has an effective reinforcement on slope.Its role on slope stability is more effective when the position of pre-stress cable on slope surface is more near to the lower sliding point of the slip surface;(2)The calculated factor of safety is larger as the pre-stress of cable is larger.Increase of horizontal inclination of anchorage cable has small effect on the calculated factor of safety.