| With the continuous improvement of urban traffic and the increasing urbanization, utilization of urban land resource is saturated, in order to meet the needs of urban development. It is a trend that builting between tall buildings in dense distribution of underground structures, deep excavation often appear when high-rise building construct.taking into account the safe operation of tunnels, supporting of excavation and the upper construction are put forward higher requirements, it need to spend a lot of money and effort to take into account settings effective support structure to reduce the hazard of tunnel.In this paper, taking Chongqing rural commercial bank building and adjacent existing tunnel project as a background, according to the the actual section size, surrounding rocks, supporting material parameters and construction method of excavation and tunnel, use the finite element software ANSYS to simulate excavation process, get displacement and internal force of lining elements and nodes, according the requirement of 《design code for highway tunnel》 to calculate lining safety factor. study on effect of lining internal force, displacement and safety factor due to excavation. analyses the following three problems:(Dto calculate two-dimension elastoplastic numerical simulation of excavating process with the finite element software, mainly analysis influence rule s of lining displacement, internal force and safety due to excavation.②to calculate two-dimension elastoplastic numerical excavation simulation with the finite element software, analysis influence rules of lining displacement, internal force and safety when rock mass shear strength and stiffness is changing.③to calculate two-dimension elastoplastic numerical simulation of excavating process with the finite element software, mainly analysis influence rule s of lining displacement, internal force and safety due to excavation when relative position of excavation and tunnel is changing. |
PDF Full Text Request