Abstract The analyses of active earth pressure subjected to earthquake shaking are routinely explored concerning dry or saturated soils. However, the fact often neglected in previous literature is that soils are mostly unsaturated in nature. This work puts forward a kinematical approach for the assessment of active resistance of a rigid retaining structure against unsaturated backfills with pseudo-dynamic approach, and the effect of a crack presented in backfills is also considered. A layer-wise summation method is employed to compute the non-uniformly distributed seismic forces due to earthquake accelerations considering time and spatial effects and corresponding work rates. Several nonlinear formulae as well as different soil-water characteristic curve models are employed to determine the additional cohesion caused by matric suction. To verify the validity of the proposed approach, a comparison is conducted with its simplified modality and conventional pseudo-static approach based on identical input conditions. The comparison results show good agreement. The lateral earth pressure can be derived from the principle of work rate balance using a numerical optimization technique. A parametric analysis is implemented to investigate the influences of crack depth, water level, dynamic factors of seismic effects and nonlinear evaluation models on the critical seismic active earth pressure.

中文翻译：

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含裂纹非饱和土的地震主动土压力拟动力法

摘要 地震作用下的主动土压力分析经常涉及干燥或饱和土壤。然而，以前文献中经常忽视的事实是土壤在性质上大多是非饱和的。这项工作提出了一种运动学方法，用于评估刚性挡土结构对非饱和回填的主动抗力，采用伪动力方法，并且还考虑了回填中出现的裂缝的影响。考虑到时间和空间效应以及相应的工作速率，采用分层求和方法来计算由于地震加速度引起的非均匀分布的地震力。几个非线性公式以及不同的土壤-水特征曲线模型被用来确定由基质吸力引起的附加内聚力。为了验证所提出方法的有效性，在相同的输入条件下对其简化模态和传统的伪静态方法进行了比较。比较结果显示出良好的一致性。侧向土压力可以从使用数值优化技术的工作率平衡原理推导出来。通过参数分析，研究了裂缝深度、水位、地震作用动力因素和非线性评价模型对临界地震活动土压力的影响。侧向土压力可以从使用数值优化技术的工作率平衡原理推导出来。通过参数分析，研究了裂缝深度、水位、地震作用动力因素和非线性评价模型对临界地震活动土压力的影响。侧向土压力可以从使用数值优化技术的工作率平衡原理推导出来。通过参数分析，研究了裂缝深度、水位、地震作用动力因素和非线性评价模型对临界地震活动土压力的影响。