基于流固耦合单元的深覆盖饱和土层场地地震分析

Abstract

基于流固耦合单元，对典型深覆盖饱和软土场地进行了不同频率成份地震波作用下的响应分析，研究了基于饱和介质理论的深软场地地震瞬态响应问题。计算结果表明，长周期地震动作用下的场地地表地震加速度和位移反应均大于普通地震波，土层的孔压比与埋深成反比，并受到地震动强度、持时和能量分布的影响。 Based on fluid-solid coupling element, long-period seismic waves and common waves were selected for seismic responses analysis of typical deep saturated soil covering layers, and dynamic transient responses of fluid-saturated two-phase porous media were discussed. The result shows that, comparing with common waves excitation, the acceleration and displacement response were increased when under long-period seismic waves excitation. The shallower buried depth may lead in the higher pore water pressure ratio, which was also affected by the magnitude of excitation, duration time and seismic energy distribution.