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震害调查表明,当地下结构处于非均匀场地、软土层或在结构侧边存在软土夹层等复杂地质环境条件时,地下结构更易遭到损坏。因此,将对含有软弱饱和土夹层场地中地铁车站的地震响应进行分析。结合已有的单相介质和流体饱和多孔介质动力分析的显式有限元方法,考虑了土层中存在软弱夹层的情况,把软弱夹层模拟为流体饱和多孔介质,建立了适用于含软弱饱和土夹层场地中地铁车站结构地震响应分析的有限元方法;进行建模数值计算,分别给出了3条具有不同频谱特性的实际地震记录以P波形式入射下地铁车站结构关键位置的地震动响应,并分析了软弱夹层的位置、厚度等因素对地铁车站结构地震动响应的影响。分析结果表明,软弱夹层对地铁车站结构地震动响应具有非常不利的放大作用,且当软夹层位于地铁车站中部时,放大作用最不利。
Earthquake damage survey shows that the underground structure is more likely to be damaged when the underground structure is in a non-uniform site, the soft soil layer or the complicated geological environment conditions such as the soft interlayer in the side of the structure. Therefore, the seismic response of a metro station in a mezzanine containing saturated and weakly saturated earth will be analyzed. Combined with the existing explicit finite element method for dynamic analysis of single-phase media and fluid-saturated porous media, considering the existence of weak interlayer in the soil layer, the weak interlayer is modeled as fluid-saturated porous medium, The finite element method for the seismic response analysis of metro station structure in mezzanine area is given. The numerical simulation results show that the three earthquake records with different spectral characteristics are given by P wave, The influence of the position and thickness of the soft interlayer on the ground motion response of metro stations is analyzed. The analysis results show that the weak interlayer has a very unfavorable amplification effect on the ground motion response of metro station structures. And when the soft interlayer is located in the middle of the metro station, the amplification effect is the most unfavorable.