加筋土挡墙的动力仿真分析

Numerical simulation on dynamic behavior of reinforced earth retaining wall

结合室内动力模型试验,开展加筋土挡墙的动力仿真分析,并编制相应的有限元法时程分析计算程序。在建模过程中采用界面单元有效模拟墙内土体与筋条及面板之间在动力荷载下的相互作用。有限元分析结果与模型试验结果吻合良好;揭示了筋条动拉力增量随动荷载增加的变化趋势;并表明墙内土体在承受动荷载作用时,其内质点对地面加速度有明显的放大效应。研究结果可为地震区加筋土挡墙的动力设计提供一定的参考。

Based on laboratory model tests,a finite element program (FEP)was developed to analyze the dynam-ic behavior of a reinforced earth retaining wall.In the FEP,the interaction between the soil and the reinforce-ment materials was simulated by an interface element.The results obtained via the finite element method agreed well with the model test results.It was revealed that the variation trend of the increment of pullout force of the re-inforcement materials increases with the input dynamic force.In addition,under the application of dynamic force,the accelerations of soil elements in the reinforced earth retaining walls were considerably increased as compared to the input acceleration of the ground.The findings of this study can provide useful references for the design of reinforced earth retaining walls in similar earthquake regions.