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土工格栅加筋挡土墙是一种柔性挡土结构物,在地震中会产生较大的变形。对土工构筑物安全起控制作用的是变形问题,为研究地震作用下模块式土工格栅加筋墙体的抗震变形特性,采用非线性动力有限差分法,分析土工格栅加筋长度和地震动强度这2个关键参数对加筋墙体地震变形特性和筋材受力特性的影响。研究结果表明,地震作用下的模块式土工格栅加筋墙体呈倾斜变形模式,墙顶残余变形最大;土工格栅加筋长度存在临界有效长度,取值在0.7 H～1.0 H之间为最佳;格栅受力沿着墙体深度先逐渐增加后又逐渐减小,最大格栅受力层在加筋体中下部,分布特征与作用在柔性挡土结构物上的土压力其分布规律基本相似。
Geogrid reinforced retaining wall is a kind of flexible retaining structure, which will produce greater deformation in the earthquake. To control the safety of geotechnical structures is the deformation problem. In order to study the seismic deformation characteristics of the geogrid-reinforced modular wall under earthquake action, nonlinear dynamic finite difference method is used to analyze the geogrid reinforcement length and ground motion strength The influence of these two key parameters on the seismic deformation characteristics and tendon stress characteristics of stiffened walls. The results show that the modular geogrid-reinforced walls under the earthquake are inclined deformation mode, and the residual deformation of the wall top is the largest. There is a critical effective length for the reinforcement length of the geogrid, which is between 0.7 H and 1.0 H The distribution of the stress and the distribution of earth pressure acting on the flexible retaining structure are the most important; the stress of the grid increases first and then decreases along the depth of the wall, and the distribution of the largest grid bearing layer in the lower part of the reinforcement, The laws are basically similar.