Research on Settlement Deformation Control of Existing Surface Buildings Underpassed by Loess Tunnel
Loess tunnels are prone to large deformation during construction,especially when loess tunnels underpass existing surface buildings,underground excavation construction will inevitably cause settlement or deformation of surface buildings.Relying on the office building project of Innovation and Entrepreneurship Base underpassed by Zhaojiayuan Tunnel of Xi'an-Yan'an HSR,this paper uses the finite element software Midas-GTS for numerical simulation,and analyzes the influence of tunnel excavation and support process on settlement deformation of the office building.The study shows that the settlement deformation rate of the office building gradually increases when the excavation face is close to the position right below the office building;the settlement deformation rate reaches its maximum when the excavation face reaches right below the office building,and the settlement value of the office building accounts for about 70％of the total settlement value;after the tunnel passes through the office building,the settlement rate of the office building gradually decreases and tends to converge.Compared with the deformation of the support structure in the tunnel,the maximum settlement value of the office building is closer to the corresponding specification control standard value.The monitoring and measurement of the settlement deformation of the office building shall be strengthened during construction.
Xi'an-Yan'an HSRZhaojiayuan Tunneltunnel underpassloess tunnelexisting buildingssettlement deformationdeformation control standard
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