Numerical Simulation And Analysis Of Surronding Rock's Stress And Displacement In Tunnel

Ground subsidence, building cracks, damage and other problems caused by tunnel construction have become common concerns in tunnel construction. So it has important theoretical and practical significance for us to make analysis of stress and displacement of surrounding rocks in the tunnel engineering.In this paper, the author studied the mechanical properties of the tunnel rock and summarized the analytical expressions of the distributions of stress and displament which was at the seeond elastic and plastic states and at the supporting state in the wall rock of tunnell. Then Taking the Linqing tunnel in Lvliang district in Shanxi province as an example and By selecting two different sections of the tunnel, the author Simulated the wall rock's stress and displacement at the elastic state, plastic state, as well as supporting plastic state.While simulating and analysizing the secondary elactic and plastic stress and displacement and the third plastic stress and displacement, the changes of stress and displacement of some points in the top tunnel and in the X direction were checked and recroded, When the model get balanced, the author drawed some curves of stress and displacement at different state.By comparint the numerical results with mechanical analysis results, the distribution of the Radial stress,Tangential stress,Radial displacement under different conditions of surrounding rock were conclused. At last,by selecting different dilatancy angle, the tunnel dilatancy effect on stress and displacement were compared and analysed.