table is above the ground surface, the approximate solution QA2 seems to be better for practical use.РAcknowledgementsРThe first author thanks two scholars for their ment on the correctness of Eq. (9).РReferencesР1 El Tani, M., 2003. Circular tunnel in a semi-infinite aquifer.Tunn.РUndergr.Space Technol.18(1),49–55.Р2 Kolymbas,D.,Wagner,P.,2007.Groundwater ingress to tunnels–the exact analytical solution.Tunn.Undergr.Space Technol.22(1),23–27.Р3 Lei,S.,1999.Ananalytical solution for steady flow into a tunnel. Ground Water37,23–26.Р4 Verruijt,A.,plex Variable Solutions of Elastic Tunneling Problems.Geotechnical Laboratory,Delft University of Technology.Р5 Verruijt,A.,Booker,J.R.,plex Variable Analysis of Mindlin’s Tunnel Problem. Development of Theoretical Geomechanics. Balkema,Sydney,pp.3–22.
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