基于多孔抽水试验的水文地质条件分析——以马城铁矿为例

Analysis of hydrogeological conditions based on multi-hole pumping test——Take Macheng Iron Mine as an example

为分析马城铁矿基岩顶部风化裂隙含水层以下基岩中发育的三条断层的导储水作用、断层间的连通性,确定矿坑涌水的直接和间接水源,运用Aquifer test软件和时间-降深曲线对该矿区抽水试验数据进行分析,以确定矿区的水力联系情况和含水层类型。结果表明,三条断层中F2断层南段导水性好,北段差,F1断层西南段导水性良好,F1东北段导水性差,西南段导水性较好,F3断层导水性差;各断层两侧裂隙发育,导水性好,是矿区内主要导水通道;在第四系底部粘土层缺失的"天窗"区,基岩与第四系水力联系紧密,表现为越流补给的承压含水层和双重孔隙介质含水层。马城铁矿水文地质条件复杂,研究结果可为马城铁矿的防治水工作和巷道掘进施工过程中地下水问题提供参考依据。

In order to analyze the water conduction and storage of the three faults developed in the base rock below the weathered fissure aquifer at the top of the Macheng Iron Mine, and the connectivity between the faults, and determine the direct and indirect water sources of the mine gushing water, the Aquifer test software and time-dropping are used. The deep curve analyzes the pumping test data of the mining area to determine the hydraulic connection and the type of aquifer in the mining area. The results show that among the three faults, the southern section of F2 has good water conductivity, but the northern section is poor. The southwest section of F1 fault has good water conductivity, the northeast section of F1 has poor water conductivity, the southwest section has better water conductivity, and the F3 fault has poor water conductivity;fractures on both sides of each fault Well-developed and good water conductivity, it is the main water channel in the mining area;in the “skylight” area where the bottom clay layer of the Quaternary system is missing, the bedrock is closely related to the Quaternary hydraulic system, which is represented by the confined aquifer and double Porous media aquifer. The hydrogeological conditions of Macheng Iron Mine are complex, and the research results can provide a reference for groundwater problems in the water control work and roadway construction process of Macheng Iron Mine.