Grout curtains are often used to manage lateral water inflow. However, grout curtains constructed in extremely fractured rocks are not very effective, which poses a challenge for mine drainage and mining operations. So, it is crucial to consider the curtain’s effectiveness when evaluating water inflow. Large-scale pumping tests and groundwater numerical simulation were used in this study to evaluate the water inflow at an iron mine surrounded by an imperfect grout curtain. The effectiveness of the curtain was determined by comparing the hydraulic differences on both sides of the curtain and flow fields at pre- and post-grouting stages and three preferential seepage paths were identified. Given the mine’s complex boundary conditions, the telescopic mesh refinement modeling method was used; regional and local models were established using FEFLOW. The predicted inflow due to the gap in the curtain was 13,880 m³/day, accounting for 37.1% of the total 37,340 m³/day of water that still flowed into the mine. Two countermeasures, surface curtain remediation and underground grouting, were used to decrease water inflow and restore mine productivity.

灌浆帘通常用于控制侧向水流入。但是，用极易碎裂的岩石构造的灌浆帘不是很有效，这对矿井排水和采矿作业构成了挑战。因此，在评估入水量时考虑窗帘的有效性至关重要。在这项研究中，使用了大规模的抽水试验和地下水数值模拟，以评估由不完善的灌浆帘包围的铁矿的水流入量。通过比较帷幕两侧的水力差异和灌浆前后的流场，确定了帷幕的有效性，并确定了三种优先的渗流路径。考虑到矿山的复杂边界条件，使用了伸缩网格细化建模方法；使用FEFLOW建立了区域和本地模型。³ /天，占仍流入矿山的总水量37,340 m ³ /天的37.1％。采取了两种对策，即地面帷幕修复和地下注浆，以减少水的流入并恢复矿山的生产力。