Abstract: Considering semi-permeable boundary condition and Terzaghi-Rendulic consolidation theory, the dissipation solution of excess pore water pressure and the ground surface consolidation settlement are obtained by using the conformal mapping and separation variable method. The analytical results are compared with the measured results from project cases, which shows good agreement. In addition, the influence laws of the soil consolidation settlement and the excess pore water pressure are obtained via the parameter analysis. The results show that the larger the permeable ratio of soil and lining is, the larger the initial rate of consolidation settlement is, but it has no influence on the final convergence value. The smaller the elastic modulus of soil is, the larger the final consolidation settlement is. The excess pore water pressure gradually increases with time, while it dissipates on a large scale in a short time after the excavation of the tunnel. The speed becomes slow when the value reaches to about one-tenth of the initial value. The longer the distance to the lining is, the smaller the initial excess pore water pressure is, and the slower the corresponding dissipation speed is.

Key words: tunnel, leakage, dissipation of excess pore water pressure, soil consolidation settlement, conformal mapping