Study on Curtain Grouting Reinforcement Technology for Water-Rich and Weak Surrounding Rock Tunnels Considering Fluid-Solid Coupling
Water-rich weak surrounding rock tunnels are prone to water and mud gushing and large deformation disasters during the construction process,and curtain grouting is an effective solution.In order to investigate the stability control technology of water-rich and weak surrounding rock tunnels,Yangguoyuan Tunnel is taken as the engineering background to establish a numerical model based on the fluid-solid coupling theory,and the reasonable thickness of the grouting reinforcement circle and the permeability ratio are determined to be 4m and 50,respectively,and at the same time,the curtain grouting construction scheme is determined and applied in the field.The results show that:after adopting the proposed curtain grouting reinforcement scheme,the maximum values of the tunnel top and bottom plate migration and side wall convergence are 90 mm and 63 mm,respectively.The surrounding rock deformation is within the permissible range,and there is no water seepage and leakage,so the surrounding rock deformation is effectively controlled.
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