云南澜沧铅矿老厂矿区深部水文地质特征

Deep Hydrogeological Characteristics of Laochang Mine,Lancang Lead Mine,Yunnan Province,China

云南澜沧铅矿老厂矿区位于云南省澜沧县北西约30 km,主要深部矿体位于当地侵蚀基准面以下,属澜沧江流域南朗河水系。为解决矿山生产实际水害问题,通过水文地质填图、坑道(钻孔)编录、水文地质钻探、抽水试验、物探测试、水文点的长期动态监测、数值模拟等多种技术手段,对矿区水文地质特征进行研究分析,通过各项水文地质试验,采用比拟法对矿井未来的1480 m中段以及深部规划设计开采中段进行涌水量预测。结果表明:矿区处于老厂云山地下水系统补给区,矿床水文地质类型属以岩溶含水层充水为主的中等至复杂类型矿床;矿区内近南北向断层F_(1)、F_(3)、F_(11)透水性好,具有较强的导水性,形成矿区深部地下水的主要补给通道;通过比拟法预测矿坑未来涌水量,其中:老厂矿区深部1000~1480 m水平正常涌水量为6027~18826 m^(3)/d,最大涌水量为11769~36757 m^(3)/d。通过本次各项技术手段及综合研究的开展,查明了老厂矿区深部水文地质特征,为矿山深部继续生产中的防治水措施提供有效设计依据。

Laochang mining area of Yunnan Lancang Lead Mine is located about 30 km to the northwest of Lancang County,Yunnan Province.The main deep orebodies are located below the local erosion base level,belonging to Nanlang River system in Lancang River Basin.In order to solve the problem of actual water damage in mine production,hydrogeological characteristics of mining areas are studied and analyzed through various technical means such as hydrogeological mapping,tunnel(borehole)cataloguing,hydrogeological drilling,pumping test,geophysical testing,long-term dynamic monitoring of hydrological points,numerical simulation and so on.The comparison method is used to predict the water inflow in the 1480 m middle section and the deep planning and design mining middle section in the future.The results show that the mine is located in the recharge area of Laochang Yunshan groundwater system.The hydrogeological type of the deposit belongs to the medium to complex type dominated by karst aquifer.The north-south faults F_(1),F_(3) and F_(11) in the mining area have good water permeability and strong water conductivity,forming the main recharge channels for deep groundwater in the mining area.The future water inflow is predicted by analogy method.The normal water inflow at 1000~1480 m deep in Laochang mining area is 6027~18826 m^(3)/d,and the maximum water inflow is 11769~36757 m^(3)/d.Through the development of various technical means and comprehensive research,the deep hydrogeological characteristics of Laochang mining area are identified,which provides effective design basis for the water prevention and control measures in the deep mine production.