Research on Invert Heave Control Technique of High-speed Railway Tunnel in Mudstone
Research purposes:In order to analyze the control effect of invert heave deformation in mudstone tunnel under the deterioration of basement surrounding rock,the finite element model of high-speed railway mudstone tunnel was established by using numerical simulation research method,considering the hygroscopic expansion and softening of the basement surrounding rock under the conditions of tunnel excavation,the control technique of floor and foot anchor bolt reinforcement was selected,the vertical displacement of surrounding rock around the tunnel,deformation and stress characteristics of the filling layer and invert were compared and analyzed before and after reinforcement.Research conclusions:(1)The basement reinforcement of the anchor bolt can effectively control the amount of surrounding rock heave at the bottom of tunnel,and the control effect on tunnel bottom heave is better in the expansion stage than in the softening stage.(2)The heave displacement curves of the invert and the filling layer before and after reinforcement are still symmetrically distributed in a"bell-shaped"shape.(3)The deformation of bottom heave at the center of invert and filling layer reaches its maximum.(4)The research results can provide a reference for the disease prevention and reinforcement of invert heave in high-speed railway mudstone tunnels.
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