Inflow to a tunnel is a great public concern and is closely related to groundwater hydrology, geotechnical engineering, and mining engineering, among other disciplines. Rapid computation of inflow to a tunnel provides a timely means for quickly assessing the inflow discharge, thus is critical for safe operation of tunnels. Dewatering of tunnels is another engineering practice that should be planned. In this study, an analytical solution of the inflow to a tunnel in a fractured unconfined aquifer is obtained. The solution takes into account either the spherical or slab-shaped matrix block and the unsteady state interporosity flow. The instantaneous drainage water table and anisotropic hydraulic conductivities of the fractures network are also considered. Both uniform flux and uniform head boundary condition are considered to simulate the constant head boundary condition in the tunnel. The effects of the hydraulic parameters of the fractured aquifer on the inflow variation of the tunnel are explored. The application of the presented solution to obtain the optimum location and discharge of the well to minimize the inflow to a tunnel is illustrated.

中文翻译：

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裂缝性双孔隙含水层中隧道的流入量

隧道流入量是一个公众关注的问题，与地下水水文学、岩土工程和采矿工程等学科密切相关。隧道入流量的快速计算为快速评估入流流量提供了及时的手段，因此对于隧道的安全运营至关重要。隧道排水是另一个应该规划的工程实践。在这项研究中，获得了裂缝无承压含水层中隧道流入的解析解。该解决方案考虑了球形或板状矩阵块和非稳态孔隙度流动。还考虑了裂缝网络的瞬时排水水位和各向异性水力传导率。均匀通量和均匀水头边界条件都被考虑来模拟隧道中的恒定水头边界条件。探讨了裂缝含水层的水力参数对隧道进水量变化的影响。说明了所提出的解决方案的应用，以获得井的最佳位置和排放，以最小化隧道的流入量。