安徽当涂杨庄铁矿区矿坑涌水量预测

Prediction of water inflow of pit in Yangzhuang iron mine area of Dangtu,Anhui Province

安徽当涂杨庄铁矿矿床属典型的玢岩型气化⁃热液交代为主的充填⁃接触交代型铁矿床,矿区位于当地侵蚀基准面以下,主要充水含水层属于以裂隙为主的裂隙⁃岩溶含水岩组,富水性中—强,东、西、北面均为隔水边界,补给条件差,围岩存在突水事故威胁。矿床顶部分布有厚层砂砾石层,但与矿体之间隔有厚层相对隔水层,水力联系微弱。文章通过解析法预计矿坑涌水量约16900~26000 m^(3)/d,判断矿床属于大水矿床,地表水不构成矿坑充水因素,矿坑排水不会引起地面变形,属水文地质勘查类型中等类型,为矿山建设提供有力支撑。

Yangzhuang iron ore deposit in Dangtu of Anhui Province is a typical filling⁃contact metasomatic iron ore deposit,which is mainly composed of porphyrite⁃type gasification hydrothermal metasomatism.The mining area is located below the local erosion base level,and the main water⁃filling aquifer belongs to fracture⁃karst water⁃bearing rock group,with medium⁃strong water yield.The East,West and north sides are water resisting boundaries,with poor recharge conditions,and the surrounding rock is threatened by water inrush accidents.There is a thick gravel layer on the top of the deposit,and there is a thick relative water⁃resisting layer between the deposit and the ore body,with weak hydraulic connection.In this paper,with analytic method,the water inflow of the mine was estimated to be about 16900~26000 m^(3)/d,and it was determined that the deposit belongs to the large water deposit.The surface water wasn′t the water filling factor of the mine,and the drainage of the mine would not cause ground deformation.It belongs to medium type of hydrogeological exploration,which provided strong support for the mine construction.