Study On The Influence Of Deep Foundation Pit Excavation On Adjacent Station And Its Seismic Response

This paper was based on a foundation excavation of xi`an metro line 5,nanshaomen station.By taking the method of Midas GTS and geotechnical centrifugal model test,the paper mainly study the influence of the foundation exacavation to the nearby metro sttation,analysis the deformation law and force characteristic of the metro station,an last,analysis the station`s dynamic response under the earthquake,this can guide the construction and design of the project.The main contents and research results are as follows.(1)By reading a large number of domestic and foreign papers,The research methods and research status of deep excavation of subway station are collected.(2)Used the finite element software MIDAS/GTS to build the 3D calculation model including super deep foundation pit,the existing station and the corresponding soil.Mainly analysis the deformation law and force characteristic of the existing metro station.Under the premise of ensuring the safety of the existing station,The key points of construction of new foundation pit are put forward.(3)Carried out the geotechnical centrifuge model experiment,by changing the displacement of the new building pit adjacent to the existing building to simulated The excavation process of the foundation pit.The general laws of the stress and deformation of the adjacent existing station during the excavation process are obtained,including Horizontal deformation,vertical deformation,ground settlement,etc.The law is similar to that of numerical simulation.(4)Aiming at the characteristics of the site in nanshaomen station,The finite element model of the station of earthquake is established,The response characteristics of the station under earthquake are analyzed.