Seepage discharge volume of tunnel and external water pressure on lining are important parameters for waterproof and drainage design of hydraulic tunnels and linings.Choosing a reasonable calculation method is crucial for the accuracy of the calcu-lation results.Three analytical methods,namely,vertical well method,image method and conformal mapping method,were used to solve seepage field of a hydraulic tunnel considering the complex system of surrounding rock,grouting circle and lining under the same simplified conditions and coordinate system.The effects of factors such as groundwater head,grouting circle permeability and thickness,and lining permeability on the tunnel seepage discharge and external water pressure on the lining were discussed aiming at Songlin tunnel.The differences between the three analytical methods were compared with numerical solutions.The results indi-cate that the difference results between the vertical well method,image method and conformal mapping method come from different calculation mechanism.The seepage discharge of unlined tunnel given by analytical solution is greater than that of the numerical solution,because the analytical solution does not consider the effect of groundwater level falling.For the tunnel seepage discharge and external water pressure of the surrounding rock-grouting circle-lining composite system,the relative errors between the three analytical and numerical solutions are all less than 10%.Increasing the thickness of the grouting circle or decreasing the permeability of the grouting circle can effectively reduce the seepage discharge of the tunnel and the external water pressure on linings.The research results can provide reference for predicting and analyzing the seepage field of hydraulic tunnels in water-rich formation.
关键词
水工隧洞/外水压力/渗流量/解析解/灌浆圈/竖井法/镜像法/保角变换法
Key words
hydraulic tunnel/external water pressure/seepage discharge/analytical solution/grouting circle/vertical well method/image method/conformal mapping method
维普
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