Numerical Investigation of Water Inflow Characteristics in a Deep-Buried Tunnel Crossing Two Overlapped Intersecting Faults

Because fault core zones and damage overlap, when a tunnel crosses the intersecting faults groundwater flow characteristics of tunnel-surrounding rock will be different compared to that from single fault. By using theory “Three-district zoning faults”, an improved Darcy–Brinkman numerical model for crossing was established in this work. Based on relative vertical positions between axis intersection center faults, underground water seepage field analyzed at steady-state by solving equation host zone zone. The simulation results show around is almost unaffected but mainly dependent heights. Specifically, position variation has little effect pore pressure. In terms velocity, regardless tunnel, maximum value velocity occurs near bottom excavation face consistently displays high values within small distance ahead face, then decreases quickly as increases. Furthermore, changes minimally rock. It likely encounter inflow rate passes through intersection. can provide practical reference predicting into deep-buried tunnels passing overlapped faults.