To investigate the effect of site specificity on the seismic response of underground structures, two centrifuge shaking table tests under adverse soil site conditions were carried out, considering the case of structures placed in saturated clay sites and saturated sand sites, respectively. Through the comparison of typical test results, the seismic response law of underground structures and soil sites in adverse soil sites are investigated and the damage patterns of underground structures under adverse soil sites are attempted to be revealed. The test results show that the column is the seismically weak member of the subway station structure, and its top and bottom is the earthquake damage-prone position of the member. Underground structures are more severely damaged in all-clay sites than in liquefiable sites. The liquefiable site becomes a natural vibration isolation system for underground structures. With the increase of earthquake amplitude, the liquefaction degree of the saturated sandy soil layer increases, and the increase in horizontal displacement for liquefiable sites is increasing compared to all-clay sites. Although the liquefaction of the saturated sand layer resulted in large horizontal displacements at the site, the structure did not experience large inter-story drifts compared to the all-clay site, which may have been caused by the reduction in the soil-structure stiffness ratio due to the liquefaction of the sand layer.

中文翻译：

---

离心机振动台试验 不利土壤条件下地下结构的地震响应研究


为了研究场地特异性对地下结构地震响应的影响，在不利的土壤场地条件下进行了两次离心振动台测试，分别考虑了放置在饱和粘土场地和饱和砂场地的结构的情况。通过对典型试验结果的比较，研究了地下结构物与不利土址下土体的地震响应规律，试图揭示不利土体下地下结构物的破坏模式。试验结果表明，该柱是地铁站结构的抗震弱构件，其顶部和底部是构件易受地震破坏的位置。全粘土场地的地下结构损坏比可液化场地更严重。可液化场地成为地下结构的自然隔振系统。随着地震振幅的增加，饱和砂土层的液化度增加，与全粘土场地相比，可液化场地水平位移的增加量增加。尽管饱和砂层的液化导致现场发生较大的水平位移，但与全粘土场地相比，该结构没有经历较大的层间漂移，这可能是由于沙层液化导致土壤-结构刚度比降低造成的。