Grouting Curtains for Mitigating Hydrogeological Connections and Water Inrush Risks From Adjacent Abandoned Mines

Water inrushes from interconnected abandoned mines pose a major threat to mining safety in complex hydrogeological settings. Conventional grouting methods often fail to systematically seal large‐scale goaf water systems. This study presents an integrated surface grouting curtain strategy to mitigate water‐inrush risks at the Zhujiao Coal Mine, where seepage was detected through a coal pillar adjacent to the flooded Liuhe Mine. The approach combines a “block–grout–reinforce” framework with detailed numerical simulations to optimize grouting parameters—specifically, a pressure of 12 MPa and a viscosity of 0.01 Pa·s—to seal major flowpaths and reduce permeability in fracture zones. Simulations indicated a rapid drop in permeability, culminating in a > 95% reduction in the −350‐m Main Roadway water inflow after 28 days of grouting. Field validation via downhole transient electromagnetic detection showed no significant low‐resistivity anomalies, confirming effective isolation of water sources. In situ water pressure tests further demonstrated a marked decrease in rock mass absorption rates, with reductions between 86.10% and 96.36%. These results verify that the proposed grouting curtain method provides a reliable and science‐based solution for regional groundwater control in multimine environments, underscoring the critical role of parameter optimization in achieving effective seepage blockage.