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开展了近场和远场地震动作用下3跨3层地铁车站结构地基液化效应的振动台模型试验,测试了地铁车站结构的加速度、应变、水平位移反应和地基土孔隙水压力、加速度、震陷及其作用于模型结构侧墙的动土压力反应。分析和总结了地铁车站结构地基液化效应特征,结果表明:模型结构对其周围地基土孔隙水压力场的分布有明显影响,结构两侧和底部地基土中的孔压峰值小于相同深度离结构较远地基土中的孔压峰值;地基土中孔压的消散速度自下而上呈逐渐减慢的趋势;地震动作用过程中,模型结构产生向上的相对运动,强地震动作用时模型结构上浮现象明显;模型结构侧墙受到的动土压力随深度增大而减小,输入地震动特性对动土压力的大小有显著影响。
Shaking table tests on the liquefaction effect of the three-span three-storey metro station under the action of near-field and far-field ground motion were carried out. The acceleration, strain, horizontal displacement responses of the subway station structure and the pore water pressure, acceleration, And its role in the model structure of the side wall of the earth pressure response. The results show that the model structure has a significant influence on the distribution of pore water pressure field around the subsoil, the peak pressure of pore water on both sides of the structure and the bottom soil is smaller than that of the same structure The pore pressure in the far foundation soil peak value; the dissipation rate of pore pressure in foundation soil tends to slow down from bottom to top; in the course of earthquake action, the model structure produces upward relative movement; Obviously, the moving earth pressure on the side wall of the model structure decreases with the increase of depth, and the vibration characteristics of the input earth have a significant influence on the earth pressure.