Application of Lattice Technology in Defect Rectification for Waterproof Board Cutting Lining Concrete at High-speed RailwayTunnel Arch

Objective Many defects related to the lining of high -speed rail tunnels gradually become prominent with the increase of the high-speed rail construction completion years. The waterproof board cutting lining concrete is one of these serious defects. In order to reduce the structural disturbance and the above defects impact on line operation, new technologies need to be used to rectify the waterproof board cutting lining defects in the arch of high-speed rail tunnel. Method Based on a dual-line high-speed railway tunnel with a design speed of 200 km/h in southwest China, two adoptable treatment schemes (cast-in-place arch and lattice technology) after its arch waterproof board cutting the lining concrete are analyzed in detail. A comparative assessment of the safety and economy of the structure is also carried out. The construction organization, process flow, protective measures and construction effects of the defect rectification scheme using lattice technology are emphatically discussed. Result & Conclusion Compared with other schemes, the lattice technology rectification scheme makes full use of the existing structure bearing capacity, repairs the tunnel only in a local area with little impact on both the existing lining structures and the high-speed railway line operation. This scheme can significantly reduce the main stress and displacement of the structure, and make the bearing capacity of the defective lining meet the design requirements.