城市地下结构，包括隧道、地铁车站、地下管线，是城市基础设施的重要组成部

Urban underground structures, including tunnels, subway stations, and underground pipelines, are an important part of urban infrastructure. It greatly affects city operations, economic development and the safety of people's lives. Therefore, it is necessary to study its seismic performance. <br>The seismic research of underground structures is mainly through prototype observation, model test and theoretical analysis. Scholars have conducted a lot of related research. <br><br>The underground structure is surrounded by surrounding soil, and its deformation is constrained by the surrounding soil. The characteristics of the soil itself are also critical to the earthquake resistance of the underground structure. The underground structure is built in various soil environments, and some of the soil may undergo seismic liquefaction. Earthquake liquefaction of the soil will cause serious adverse effects on the site and structure. <br>The influence of seismic liquefaction of soil on structure still needs more in-depth study. <br>Studying the effect of seismic liquefaction of soil on the structure is beneficial to the designers of underground structures to rationally design the underground structures at sites where seismic liquefaction may occur. According to the existing research results and the existing problems in the research status, the following new problems need to be clarified. What is the interaction between the soil and the structure after the earthquake liquefaction? In the numerical simulation, the interaction between soil and structure has a critical influence on the calculation results. Reasonably simulating the interaction between soil and structure is an important step in the research. What is the effect of liquefied soil at different locations on the structure in the same site?

Urban underground structure, including tunnels, subway stations, underground pipelines, is an important part of urban infrastructure. It greatly affects urban operations, economic development and the safety of people's lives. Therefore, it is necessary to study its seismic properties.<br>Seismic research of underground structure is mainly through prototype observation, model test and theoretical analysis. Scholars have done a lot of research.<br><br>The underground structure is surrounded by the surrounding soil body, its deformation is bound by the surrounding soil body, the characteristics of the soil body itself is also critical to the underground structure earthquake resistance. Underground structures are constructed in a variety of soil environments, some of which can be liquefy by earthquake. Seismic liquefaction of soil will have serious adverse effects on the site and structure.<br>The effect of seismic liquefaction on structure of soil body still needs more research.<br>Studying the effect of seismic liquefaction on structure of soil is beneficial to the designers of underground structures to design underground structures rationally at the sites where seismic liquefaction is possible. According to the existing research results and the existing problems in the current situation of research, the following new problems can be put forward. What is the interaction between soil and structure after seismic liquefaction? In numerical simulation, the interaction between soil and structure has a key influence on the calculation results. It is an important step of study to simulate the interaction between soil and structure reasonably. In the same site, what is the effect of liquefied soil in different locations on the structure in the earthquake?

Urban underground structure, including tunnels, subway stations and underground pipelines, is an important part of urban infrastructure. It has a great impact on urban operation, economic development and people's life safety. Therefore, it is necessary to study its seismic performance.<br>The aseismic research of underground structure is mainly based on prototype observation, model test and theoretical analysis. Scholars have done a lot of relevant research.<br>The underground structure is surrounded by the surrounding soil, and its deformation is constrained by the surrounding soil. The characteristics of the soil itself are also critical to the earthquake resistance of the underground structure. Underground structures are built in different soil environments, some of which may be liquefied by earthquake. The earthquake liquefaction of soil will have a serious adverse impact on the site and structure.<br>The influence of soil liquefaction on the structure still needs further study.<br>The study of the influence of soil liquefaction on the structure is beneficial for the designers of underground structure to design the underground structure reasonably in the site where earthquake liquefaction may occur. According to the existing research results and the existing problems in the research status, the following new problems can be put forward. What is the interaction between soil and structure after earthquake liquefaction? In the numerical simulation, the interaction between soil and structure has a key influence on the calculation results. It is an important step to simulate the interaction between soil and structure reasonably. In the same site, what is the effect of different locations of liquefied soil on the structure in the earthquake?<br>