| With the rapid development of traffic construction in our country,the ground transportation network becomes more and more complex,so the construction of highway tunnel is very important.The characteristic of V-class surrounding rock is weaker,so it is necessary to use the reasonable excavation method to simulate the tunnel construction process by numerical simulation,and to analyze the response rule of surrounding rock and support.It is necessary to simulate and analyze the response of the tunnel under the earthquake,because most of the area of our country is earthquake prevention area,once the earthquake may bring catastrophic damage to the highway tunnel.The construction process of highway tunnel is numerically simulated by finite element software ANSYS.Using the plane strain model,the deformation of the surrounding rock,the law of the surface subsidence trough and the distribution of the axial force of the bolt under different excavation methods are obtained.Through the 3D numerical simulation of the tunnel construction process,the displacement and stress of the surrounding rock and the law of the Mises stress of the lining are obtained,and the results of the plane and three-dimensional simulation are compared.The response of tunnel under earthquake is simulated by the finite-difference software FLAC3 D.The acceleration,displacement and principal stress response of the main monitoring points of the tunnel under seismic loading are analyzed.The results show that,CRD method is the most reasonable excavation method,and the ground subsidence trough is related to the depth of the tunnel.The displacement around the tunnel is large and there is obvious stress concentration.The displacement of surrounding rock in plane simulation is larger than that in three-dimensional simulation.The responses of displacement,velocity,acceleration and principal stress around the tunnel are larger under earthquake,and the position of arch shoulder is the most dangerous especially. |
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