Numerical Analysis Of Influence Of Metro Tunnel Construction On Ground Surface And Buildings

With the rapid development of urbanization in C hina,urban traffic becomes more and more crowded.In order to optimize the layout of urban road traffic,many cities begin to use underground space,city subway has become an important method to solve urban traffic congestion as a convenient and efficient way of transport.Due to most of the underground tunnels are concentrated in the downtown area of the city that bulidings are intensive,the construction of subway tunnel inevitably changes the mechanical properties of the surrounding soil,which leads to different degrees of the surface and the buildings,when condition is severe,surface collapse occurred and the building collapsed.So it is very important to study the influence of the tunnel construction on the surface and the deformation of the buildings and the corresponding control measures.Through learning the literature at home and abroad and combining the engineering background which Q ingdao metro line three Wan Li interval crosses the wanlong market,this article studies the deformation and stress analysis under the condition of different angles,different distances and different construction methods betwween bulidings and tunnels.The main contents are as follows:(1)This article systematically introduces the background and significance of this research,and discusses the research status which the subway construction at home and abroad has influence in the safety of the building above in two aspects that the surface deformation and the building damage caused by tunnel construction;(2)This article detailedly analyzes the mechanism and the main influence factors of ground and buildings’ movement and deformation caused by tunnel construction,and expounds the common rule of horizontal surface settlement a nd vertical settlement of ground,and states building cracks and distribution characteristics of buildings under the influence of tunnel construction;(3)According to the geological conditions of Q ingdao,the use of Midas-GTS to establish 3D finite element model of tunnel soil building,and the ground deformation and the internal force analysis of the building are simulated under the condition of different angles and different horizontal distance between the building and the tunnel;(4)Based on the engeering which Q ingdao subway line 3 wanli interval crosses wanlong building,the influence of construction by two tunnel construction schemes is simulated by the advance small duct grouting reinforcement and the excavation of the step method and the anchor and shotcrete support measures and the full face excavation and anchor shotcrete support,and guiding the actual construction through comparing the numerical simulation results;...