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可液化土体动力特性的描述方法可能对群桩基础动力反应产生显著的影响。基于Davidenkov本构模型和Byrne改进的增量孔压模型,对比分析了总应力法和有效应力法计算的可液化地基中群桩基础地震反应特性。结果表明,群桩外侧地基最易液化,自由场地基次之,群桩内地基土最不易液化;与总应力法的计算结果相比,有效应力法计算得到的地表加速度反应谱谱值的短周期过滤和长周期放大效应更加显著,卓越周期向长周期方向移动;同时,有效应力法计算得到的桩身弯矩也有所增大。
The description of the dynamic characteristics of liquefiable soil may have a significant effect on the dynamic response of pile foundation. Based on Davidenkov’s constitutive model and Byrne’s improved incremental pore pressure model, the seismic response characteristics of pile foundation in liquefiable foundation calculated by the total stress method and the effective stress method are comparatively analyzed. The results show that the outer foundation of group pile is liquefied most easily, the free foundation is the second most, and the foundation soil in the group pile is the least liquefiable. Comparing with the calculation results of the total stress method, the value of the surface acceleration response spectrum calculated by the effective stress method is short Periodic filtering and long-period amplification effect are more significant, and excellent period moves to the long period. Meanwhile, pile bending moment calculated by effective stress method also increases.