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基于已完成的液化场地土—桩—桥梁结构地震相互作用振动台试验,利用两步法、等效单桩法,建立了液化场地群桩基础抗震分析的动力非线性文克尔地基梁模型。该模型考虑了桩—土相互作用的影响。首先,按照等刚度原则将群桩简化为等效单桩;其次,选用弹簧元件和阻尼原件并联的宏单元模拟桩—土动力相互作用;然后,计算地震作用下自由场地的土体位移和孔压比;最后,将地震作用下自由场地土体位移和孔压比作为模型的外部激励,计算桩的动力反应规律。将简化方法计算结果与液化场地桥梁桩基振动台试验结果进行对比发现,两者吻合较好,验证了简化方法的正确性。
Based on the completed shaking table test of soil-pile-bridge seismic interaction in liquefied field, a dynamic nonlinear Winkel foundation beam model for seismic analysis of group pile foundation in liquefied site was established by the two-step method and equivalent single pile method. The model considers the effect of pile-soil interaction. Firstly, the pile group is reduced to the equivalent single pile according to the principle of equal stiffness. Secondly, the macro-element model with spring elements and damping elements is used to simulate the pile-soil dynamic interaction. Then, the displacement and the hole Pressure ratio. Finally, the displacement and pore pressure ratio of free soil subjected to earthquake are taken as the external excitation of the model to calculate the dynamic response of the pile. Comparing the calculation results of simplified method and the shaking table test results of bridge pile foundations in liquefied sites, the agreement between them is good, which verifies the correctness of the simplified method.