| With the increasing population and pace of urbanization in China,more and more attention has been paid to the development and utilization of underground space.During the development and construction of underground space,a large number of foundation pit projects located in prosperous urban areas need to be built.The excavation and construction of foundation pit will change the stress and displacement fields of surrounding strata,thus endangering the safety of adjacent buildings.Therefore,it is of great significance to study the influence of foundation pit excavation on adjacent buildings.In this research,a foundation pit near Wuhan Metro Tunnel is taken as an object,and numerical simulation method is used to study the underpass tunnel deformation caused by excavation and support of the foundation pit.The main contents and conclusions are outlined as follows:(1)We summarized the influence of foundation pit excavation on adjacent tunnels.Then analyzed the causes and processes of foundation pit deformation,including foundation pit bottom uplift,foundation pit support structure deformation and ground settlement,and finally we also summarized and analyzed the calculation and analysis methods of the deformation.(2)Using Qixing Deep Foundation Pit Software,the supporting scheme of foundation pit was analyzed,the safety factor and deformation of foundation pit stability were checked,and the safety evaluation of supporting scheme was carried out.(3)The three-dimensional numerical model of tunnel and foundation pit engineering was established by using numerical calculation software.The influence of the whole excavation process of foundation pit on the horizontal and vertical deformation of tunnel was calculated and analyzed.The influence of the rigidity of foundation pit supporting system,tunnel itself on the tunnel deformation were analyzed,and the conditions and rules for controlling the deformation of tunnel were conducted. |
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