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用有限差分分析软件FLAC3D,建立了土-地铁站结构相互作用的非线性动力数值计算模型。分析了相同埋深及地质环境下,两种连拱式地铁站结构在不同地震动作用下的动应力、相对位移和加速度响应规律,总结了两种地铁车站结构形式在抗震性能方面的优缺点。并对Z1型地铁站的结构形式进行了两种优化,用数值方法检验了优化后车站结构的抗震性能。检验结果表明,优化方案B具有较好的抗震性能:在Kobe波作用下,Mises应力峰值下降14.8%,最大主应力峰值下降18.8%;在Loma Prieta波作用下,Mises应力峰值下降7%,最大主应力峰值下降23.2%。
Using finite difference analysis software FLAC3D, a nonlinear dynamic numerical model of soil-subway interaction is established. Under the same depth and geological environment, the dynamic stress, relative displacement and acceleration response of two double-arched metro stations under different ground motions are analyzed, and the advantages and disadvantages of the two kinds of metro station structures in terms of seismic performance are summarized . Two kinds of optimization of the structure of Z1 subway station are carried out. The seismic performance of the optimized station structure is verified by numerical method. The test results show that the optimized scheme B has better seismic performance: under the action of Kobe wave, the Mises stress peak decreases 14.8% and the maximum principal stress peak decreases 18.8%; the Mises stress peak decreases 7% under the action of Loma Prieta wave, The main stress peak decreased 23.2%.