Abstract
As more and more karst tunnels have been operated, the disease of operating karst tunnels becomes more and more serious. In order to analyze the distribution regularities of water pressure of lining structure under the influence of rainstorm, a three-dimensional numerical model was established to study the distribution pattern of water pressure of lining structure in water-rich karst tunnel, and the internal force of lining and the applicability of half-pack and half-drain in water-rich karst tunnels were also analyzed. The results show that the water pressure in the vault of the tunnel is small, and is high in the invert area. The invert is subjected to tensile stress. For water-rich karst tunnels, the invert of the tunnel bears relatively large water pressure when the half-pack and half-drain are adopted, which is of poor applicability, so the center of the invert is easy to crack. Therefore, it is necessary to optimize the waterproof and drainage modes. The results can provide a reference for the design of water-rich karst tunnels.
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