衡重式挡土墙稳定性的系统可靠性分析

System Reliability Analysis of the Stability of the Balance Weight Retaining Wall

摘要: 考虑岩土体参数的随机性和失稳模式间的逻辑关系，建立了衡重式挡土墙稳定性的系统可靠分析方法，并进行了实例分析。研究表明，衡重式挡墙是由墙身、填料、地基组成的一个结构系统，其稳定性受到多种因素的影响，存在多种失效模式；挡墙滑移、倾覆、地基承载力不足和墙身剪切等四种模式构成混联系统，其中抗滑稳定性与抗倾覆稳定性是不相容关系，并与地基承载力稳定性和抗剪稳定性构成串联系统；衡重式挡土墙任一单一失效模式下的可靠度并不能等同于其结构系统的可靠度，对比各单一失效模式的可靠度值，可找出衡重式挡墙结构系统的最薄弱环节。

Abstract: Based on the logical relation between the random and unstable modes of rock and soil parameters, the system reliability analysis method for the stability of the constant weight retaining wall is established, and an example analysis is carried out. The results show that the study of balance weight retaining wall is composed of a wall body, filler, foundation consisting of a structure system, its stability is affected by many factors, the existence of multiple failure modes; retaining wall sliding, overturning and foundation bearing capacity is insufficient and wall shear four mode hybrid system, the anti sliding stability and anti overturning stability is incompatible, and the bearing capacity of stability and shear stability series system; balance weight retaining wall of any single failure mode reliability and can not be equated with the structure system reliability, compared to the single invalid mode of reliability value, can find the balance weight retaining wall structure system of the weakest link.