A Semi-Analytical Model and Parameter Analysis of a Collaborative Drainage Scheme for a Deeply Buried Tunnel and Parallel Adit in Water-Rich Ground

For a railway or highway tunnel under high water pressure during operation, various factors such as the design of drainage system, material aging, and pipeline blockage must be considered for tunnels to work with parallel adit drain control external on lining. A simplified steady-state seepage model in semi-infinite multi-connected domain was established solved iteratively using complex variable method Schwartz alternating method. After verifying numerical simulation, parametric analysis, orthogonal tests, multivariate nonlinear regression were also carried out. Results show that theoretical its semi-analytical algorithm have fast convergence speed, obtained formula is simple, which suitable calculation parameter analysis. scheme primarily relies would make lining facing side less than opposite side. Therefore, reduce uniformly meet requirements surrounding rock stability, horizontal net distance between should no diameter. Drainage volume linearly negatively correlated has most significant effect reduction. The influence vertical small.