数值模拟悬臂式挡土墙的动力响应

The Dynamic Response of Numerical Modeling Cantilever Retaining Walls

通过进行非线性显式有限差分分析,分析悬臂式挡土墙在地震作用下的动力响应。用有限差分分析计算的压力结果与物部-冈部理论预测的结果进行对比分析表明：在加速度较小时,有限差分法产生的压力与物部-冈部理论预测的结果基本吻合,而随着水平加速度的增加,其产生的压力明显比物部-冈部理论的大。此差异归因于挡土墙系统的灵活性,且滑动楔体是分多块滑动而不是整体滑动。同时分析了墙体位移的变化情况在地震作用下加速度最大值不同时,并得到其最大位移量约为0.33m。

The difference analysis of non-linear explicit finite was performed to analyze the dynamic response of cantilever retaining wall under the action of earthquake. Comparing the results of the finite difference analysis to the result of Mononobe-Okabe theory for computing dynamic earth pressures, it was found that at very low levels of acceleration, the pressures induced by finite difference method were in general agreement with those results predicted by the Mononobe-Okabe method. However, as the increase of horizontal acceleration, the induced pressures are larger than those predicted by the Mononobe-Okabe method. The discrepancy is attributed to the flexibility of the retaining wall system and to the observation that the sliding wedgies slipped with pieces instead of as a whole. Additionally, the article analyzes the wall displacement change of different maximum acceleration under the action of earthquake, and obtains the maximum displacement is about 0.33m.