Earth fissures, special engineering geological hazards, destroy the integrity of the ground and enlarge seismic responses of structures. Because of this, the safety of structures in the earth fissure environment is hard to guarantee, especially in bustling areas of the city in which underground stations and surface structures are affected by each other under earthquakes. In this paper, the 3D finite element models of the surface structure, underground station, and ground soil with earth fissure were built, taking into account the interaction between structures and soil. Then, the artificial boundary was verified, and seismic behaviors of earth fissure ground were compared with the test result. The experiment and the calculation result showed the same tendency. Moreover, the key parameters of the simulation model were modified, and the acceleration amplification factors of the underground station were analyzed. Finally, based on the most unfavorable condition, the failure mechanism of the underground station was analyzed. The numerical results indicate that the existence of earth fissure and surface structure amplifies the seismic responses of the underground station. The increase in floor number of surface structure and decrease in shear modulus of soil also enlarge the seismic responses of the underground station, and this amplification effect is more obvious in the earth fissure environment. The columns of the underground station in the hanging wall are one of the crucial parts to the bearing capacity of the station, and are destroyed due to the P-Δ effect and the uneven vertical settlement of the underground station. These results are significant for studying the effect of earth fissure on the seismic responses of the underground station.

裂隙是特殊的工程地质灾害，会破坏地面的完整性并扩大结构的地震响应。因此，很难保证裂隙环境中结构的安全性，特别是在城市中熙熙areas的地下车站和地表结构在地震中相互影响的地区。本文考虑了结构与土壤之间的相互作用，建立了地表结构，地下车站和具有裂隙的地面土壤的3D有限元模型。然后，验证了人工边界，并将裂隙地面的抗震性能与测试结果进行了比较。实验和计算结果显示出相同的趋势。此外，修改了仿真模型的关键参数，分析了地下车站的加速度放大系数。最后，根据最不利的条件，对地下车站的破坏机理进行了分析。数值结果表明，地裂缝和地表结构的存在放大了地下车站的地震反应。地表结构层数的增加和土壤剪切模量的减小，也增大了地下车站的地震反应，这种放大效应在裂隙环境中更为明显。地下车站悬墙中的柱子是影响车站承载能力的关键部分之一，并且由于受到破坏而被破坏。分析了地下车站的破坏机理。数值结果表明，地裂缝和地表结构的存在放大了地下车站的地震反应。地表结构层数的增加和土壤剪切模量的减小，也增大了地下车站的地震反应，这种放大效应在裂隙环境中更为明显。地下车站悬墙中的柱子是影响车站承载能力的关键部分之一，并且由于受到破坏而被破坏。分析了地下车站的破坏机理。数值结果表明，地裂缝和地表结构的存在放大了地下车站的地震反应。地表结构层数的增加和土壤剪切模量的减小，也增大了地下车站的地震反应，这种放大效应在裂隙环境中更为明显。地下车站悬墙中的柱子是影响车站承载能力的关键部分之一，并且由于受到破坏而被破坏。地表结构层数的增加和土壤剪切模量的减小，也增大了地下车站的地震反应，这种放大效应在裂隙环境中更为明显。地下车站悬墙中的柱子是影响车站承载能力的关键部分之一，并且由于受到破坏而被破坏。地表结构层数的增加和土壤剪切模量的减小，也增大了地下车站的地震反应，这种放大效应在裂隙环境中更为明显。地下车站悬墙中的柱子是影响车站承载能力的关键部分之一，并且由于受到破坏而被破坏。P-Δ效应和地下车站的垂直沉降不均匀。这些结果对于研究裂隙对地下车站地震反应的影响具有重要意义。