A Semi-Analytical Model for Prediction of the Steady-State Seepage Field Around a Tunnel in Permeable Anisotropic Strata
During the construction and operation of tunnels,engineering challenges associated with seepage flow are consistently encountered,such as the damage of support structures or water influx.The main objective of this study is to analyze the hydraulic behavior of supported tunnels constructed in saturated ground,taking into account anisotropy of permeability and the effect of grouting/support on the seepage flow.In the determination,the coordinate transformation and the conformal mapping technique are employed to solve the governing equations,meanwhile,the points matching method is used to address the coordinate conditions of pore pressure and water flux at the rock-support interface.Finally,semi-analytical solutions of pore pressure distribution subjected to steady flow state are obtained,for the surrounding rock and the grouting/support zone.In the verification step,satisfactory agreement is achieved between the proposed analytical solutions and the numerical predictions.Then,in the parametric analyses step,the developed analytical model is applied to investigate the effect of support permeability,anisotropy of rocks'permeability,and the thickness of the grouting/support zone,etc.,on the seepage flow and the pore pressure distributions of tunnels.
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