## 5 Conclusions
Since the shear capacity of the overlying soil is weak for these two types of structures during a direct downward strong earthquake, the research process in this paper only considered the overlying soil during the earthquake as an additional mass acting on the top of the structure. For structures with a deeper burial depth and underground structures constructed using the concealed excavation method, the action of the overlying soil on the structure during an earthquake needs to be further studied [43]. Since underground structures are located in a complex and changing environment, there are many uncertainties, and seismic research of underground structures needs the joint effort of many scholars. Methodology, J.J.; Validation, J.Z. Both authors contributed equally. All authors have read and agreed to the published version of the manuscript. This research was funded by the National Natural Science Foundation of China (NO. 51908108). Not applicable. Data Availability Statement: Data are provided upon request to the corresponding author. The authors declare no conflict of interest. * (31) [PERSON]; [PERSON]; [PERSON] Causal analyses of different degree of earthquake damage occurred on Daikai subway station and its running tunnels during Kobe earthquake. _J. Disaster Prev. Motifi. Eng._**2020**, _40_, 326-336. * (32) [PERSON]; [PERSON]; [PERSON]; [PERSON] Seismic mitigation effect analysis on friction pendulum bearing applied in the underground subway station. _Eng. Mech._**2019**, _36_, 60-67. * (33)_GB 50011-2010_; Code for Seismic Design of Buildings. China Building Industry Press: Beijing, China, 2010. * (34) [PERSON] Prediction of the maximum seismic member force in a superstructure of a base-isolated frame building by using pushover analysis. _Buildings_**2019**, \(9\), 201. [CrossRef]
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