重力式挡土墙稳定性可靠度计算及其系统分析

Calculation of Reliability of the Gravity Retaining Wall's Stability and Its System Analysis

通过建立计算分析模型,采用"一次二阶矩中心"法,计算了重力式挡土墙倾覆和滑移两种失稳模式的可靠度指标,并将计算结果与"安全系数"法的验算结果进行了对比,得出重力式挡土墙结构在满足"安全系数"法验算条件下,仍存在一定的失效概率。此外,基于系统分析法得出,滑移稳定性失效的概率近似于整个系统稳定性失效的概率,建议在设计验算中注重考虑重力式挡土墙的滑移稳定性。

Through the establishment of calculation and analysis model, the reliability indexes of the two unstable modes （overturn and sliding） of the gravity retaining walls are calculated by using the first-order second-moment theory, and the results are compared with the checking results that calculated by the safety factor method, it shows that there is still a certain failure probability in spite the gravity retaining walls meet the checking conditions of the safety factor method. Besides, based on the system analysis method, it is put forward that the failure probability of the sliding＇s stability is similar to the failure probability of the whole structure＇s stability. And the stability of sliding of the gravity retaining walls should be paid more attention in the design of checking calculation.