采区岩溶水文地质条件综合分析及疏放性评价

Comprehensive Analysis and Drainage Evaluation of Karst Hydrogeological Conditions in the Mining Area

以淮南煤田顾北煤矿中央1煤采区岩溶地下水为研究对象,利用水文地质综合分析与放水试验方法,对采区边界断层两侧岩溶含水层水位、水质进行对比,分析采区水文地质条件,建立水文地质模型,开展疏放性评价。结果表明:F104和F92断层组均为隔水边界;可将矿井分为三个相对独立采区水文地质单元;其中的中央采区C3I组灰岩井下疏放水补给主要来自浅部露头区,水动力沿单斜地层从浅部向深部逐渐减弱。当C3I组总疏放量为120 m3/h时,60天后,含水层突水系数小于0.06 MPa/m,水位满足煤层安全开采要求。

Taking the karst groundwater in Central 1 coal mining area of Gubei Coal Mine in Huainan coal field as the research object,the water level and water quality of the karst aquifer on both sides of the boundary fault of the mining area are compared by using the comprehensive hydrogeological analysis and water release test method.The hydrogeological conditions of the mining area are analyzed,and the hydrogeological model is established to carry out the drainage evaluation.The results show that both F 104 and F 92 fault groups are water-resisting boundaries,which divide the mine into three relatively independent mining area hydrogeological units.The drainage water supply of C 3I group limestone in the central mining area mainly comes from the shallow outcrop area,and its hydrodynamic force gradually weakens from shallow to deep along the monoclinal formation.When the total drainage of C 3I group is 120 m 3/h,the water inrush coefficient is less than 0.06 MPa/m after 60 days,and the water level meets the safety mining requirements of coal seam.