基于强度折减法的加筋挡土墙动力稳定性分析

地震作用下的稳定性是加筋挡土墙的主要设计内容之一.基于拉格朗日有限差分原理与强度折减法,采用FLAC 3D数值模拟软件,对一座高5 m的土工格栅加筋挡土墙进行数值模拟. 分析其动力及强度折减作用下墙面板最终位移、关键点时程位移、土体沉降、各层土工格栅拉力最大值以及单层土工格栅拉力值分布. 结果表明:关键点的位移与折减系数有较好的对应关系,加筋挡土墙处于临界稳定状态下的强度折减系数可作为动力稳定系数,在突破稳定系数后,各项参数值均有明显变化.

Dynamic stability analysis of reinforced retaining wall based on strength reduction method

The stability of the reinforced retaining wall under earthquake action is one of the main contents of the retaining wall design. A numerical simulation of a 5 m high geogrid-reinforced retaining wall was carried out by using FLAC 3D numerical simulation software, which was based on the Lagrangian finite difference principle and the strength reduction method. The final displacement of the retaining wall, the time history displacement of the key points, the settlement of the soil, the maximum tensile force for each layer of geogrid and the distribution of the tensile force for the single-layer geogrid were analyzed under the dynamic and strength reduction. The results showed that the displacement of the key point has a good correspondence with the reduction factor. The strength reduction coefficient of the reinforced retaining wall under critical stability can be used as the dynamic stability factor of the reinforced retaining wall. After breaking through the stability factor, all parameters changed significantly.