【摘要】 目的考虑填土黏聚性对刚性挡土结构地震土压力的影响,发展便于工程设计使用的地震永久位移的计算方法.方法基于Raffnsson、Wu和Prakash方法的基本思路,考虑填土黏聚力的地震土压力解析解,建立累积位移的计算模型.考虑墙体滑移和转动两种位移模式相耦合以及地基土动力非线性,对离心机试验结果、Newmark滑块法进行对比分析.结果所得总的永久位移为0.225 7 m,略高于试验结果.其中滑动位移为0.088 2 m,与Newmark滑块法接近.结论算例表明填土黏聚力能够降低永久位移.算法简单实用,偏于安全.更多还原

【Abstract】 For the purpose of the displacement-based seismic design of rigid retaining walls with cohesive backfill,a procedure is needed to compute seismic permanent displacement.Based on the Raffnsson,Wu and Prakash’s framework and the theory on seismic earth pressure of cohesive backfill,a model was established to compute the cumulative displacement.A coupling mode of sliding and rocking was considered,and the dynamic nonlinearity of foundation soil and the cohesion of backfill soil were simulated.The applicability of the model was demonstrated by comparing data with a centrifuge test and the Newmark’s slide-block method.The total displacement computed by this model was slightly greater than the one recorded during the test,and the sliding displacement was very closed to the one calculated with the Newmark’s method.Permanent displacement tends to decrease with the cohesion increasing.The results show that the proposed method is simple,clear and conservative.更多还原