Review of researches on seismic response of close underground crossing structures

In view of the design and use requirements, a large number of close underground crossing projects have emerged, forming a complex interaction system between soil-crossing structural groups. When a number of underground structures are close to each other, there is a dynamic interaction between the structure and the adjacent soil, and between the structures themselves under the action of earthquake, and the seismic response laws of the underground through-structure system are more complicated. Based on the inductive sorting of a large number of actual close-range engineering cases, the underground crossing structures are roughly divided into tunnel-tunnel crossing system, tunnel-subway station crossing system, and subway station-subway station crossing system. Then, on the basis of summarizing the characteristics of underground crossing engineering cases, the current status and progress of seismic response researches on each crossing system are expounded, respectively. The shortcomings and problems in the existing researches are pointed out, and some suggestions for further researches are given.