The Analysis Of The Urban Tunnel In The Process Of The Excavation And In Different External Loads

With the development of subway tunnel, construction of tunnel attracts more and more environment damage due to the attention. Tunneling will inevitably result in a loss of g round due to soil deformation and displacement into the opening. During and after the construction the tunnel should be responsible for the damage which can occur at the appearance of buildings or cause functional expense for the buildings. The cost of economy for strengthening buildings is relatively significant. According to the characteristics of tunneling, by using the ANSYS software of the finite element method to analyse the Strata displacement and the force condition of the supporting with the condition of different depth, different surrounding rock of classes and existing overlying buildings.And the the Strata displacement of the moving load on the ground after the completion of the tunnel.The ground subsidence theories on tunnel excavation were summarized, and introduce the stratum subsidence mechanism, the transverse and longitudinal deformation rules of ground subsidence caused by tunnel excavation,and the influence of the interaction of the tunnel and adjacent buildings.A model of two-dimensional finite element is established. According to simulating the process ofthe benching tunneling construction method, analyze the the settlement of the ground and the Tunnel vaults, and the force condition of the tunnel linings and anchors. Make a conclusion through the comparison.Make a finite element model of City metro tunnel excavation which has a building on it, analyze and compare with the settlement of the ground and the building with its foundation, and the stress states of the linings and anchors in the condition of different depth, different surrounding rock of classes. The research results are practical value to the design and city construction of tunnel.Build an urban subway tunnel structure model that has a moving load on the ground after the completion of the tunnel.By using the ANSYS software to make an integral structure dynamic analysis. The research mainly contains the settlement of the ground and tunnel vaults, and the force of the tunnel vaults with the conditions of the different surrounding rock of classes, the different depth and the different speeds.