南非西格里夸兰盆地某铁锰矿水文地质条件及矿坑涌水量预测

矿坑涌水是矿坑地下开采面临的首要问题,南非西格里夸兰盆地某铁锰矿属于未开采矿山,主要含水层为第四系松散岩类孔隙水含水层和基岩裂隙含水层。第四系松散岩类孔隙水含水层接受大气降水的入渗补给,主要排泄方式为蒸发和向基岩裂隙含水层补给。基岩裂隙含水,主要接受大气降水和第四系松散岩类孔隙水含水层补给,并沿导水性较好的构造裂隙径流,主要排泄方式为人工取水和矿坑排水。该区矿坑充水因素主要为大气降水和地下水,初步预测量矿坑正常涌水量950 m^(3)/d,最大涌水量2400 m^(3)/d,为矿区开展下一步工作提供了水文地质资料。矿山开采中应当加强监测和防范,注意附近邻区矿山采空区老空水的变化,及时评估其对矿坑涌水的影响。建立完善的防排水体系,以确保安全生产。

Hydrogeological conditions of iron-manganese deposit in Mukulu, Griqualand West Basin, South Africa:Prediction of mine water inflow

Mine water inflow is the primary problem faced by underground mining. The iron-manganese mine belongs to unexploited mountains. The aquifer should be quaternary loose rock pore water aquifer and bedrock fissure aquifer. The pore water aquifers of the quaternary unconsolidated rocks receive infiltration and recharge of atmospheric precipitation, and the main discharge methods are evaporation and recharge to the fractured aquifers of the bedrock.The bedrock fissure contains water, which is mainly replenished by atmospheric precipitation and quaternary unconsolidated rock pore water aquifer, and runoff along the structural fissure with good water conductivity. The main drainage methods are artificial water intake and pit drainage. In this paper, the hydrogeological conditions of the mining area are comprehensively analyzed, and the groundwater recharge, runoff and discharge conditions are discussed, and then the factors of water filling in the mine pit are mainly atmospheric precipitation, groundwater and surface water. The preliminary prediction is that the normal water inflow of the mine pit is 950 m³/d and the maximum water inflow is 2,400 m³/d, which provides hydrogeological data for the next step of the mine area. Monitoring and prevention shall be strengthened in mining, attention shall be paid to changes in goaf water in nearby mines, and timely assessment shall be made of its impact on gusher water in mines.To establish a sound system of water control and drainage to ensure production safety.