Nonlinear Finite Element Analysis of Tunnel Structure in Qinling Deep-buried TBM Construction of Hanjiang-to-Weihe River Water Diversion Project
The stability analysis of surrounding rock and lining structure is an important topic in the study of rock mechanics of deep-buried tunnels.Based on the elastoplasticity of rock materials,ANSYS software is used to establish a three-dimensional finite element simulation model of the water conveyance tunnel structure in Qinling deep-buried TBM construction.The excavation and support construction process of the Ⅳ-type surrounding rock section of the unfavorable geology is processed by the life and death unit function in the software program,and the displacement deformation and stress distribution characteristics of the rock mass and lining structure during the excavation,initial support and segment lining of the tunnel are analyzed.The rock mass and segment lining structure after excavation of class Ⅳ surrounding rock section in TBM construction are safe and reliable.The maximum compressive stress is mainly distributed in the surrounding rock of the tunnel and the side wall of the lining structure.In the range of 120° of the top arch of the surrounding rock and lining structure,the distribution of compressive stress is dense and the stress is relatively concentrated.The research results can provide reference for the design,construction and operation of Qinling deep-buried TBM construction tunnel.
Deep buried tunnelfinite elementlife and death unitdisplacement deformationstress distribution
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