袁大滩煤矿首采区煤层顶板水文地质特征研究

Research on Hydrogeological Characters of Coal Seam Roof Aquifers in First Mining Area of Yuandatan Coal Mine

对袁大滩煤矿首采区煤层顶板水文地质特征进行了研究。结果表明:该矿井2#煤开采后,个别钻孔导水裂缝带发育高度将到达直罗组上段,但是不会沟通第四系含水层;直罗组与第四系之间存在隔水性能较好的相对隔水层,与2-3-1煤间含水层水力联系也较弱,粉-细砂岩层具有一定隔水能力;上部含水层补给、径流条件较好,循环交替活跃;下部含水层径流条件较差、交替缓慢;含水层比较容易疏降,但是含水层渗透系数较小,透水性较弱,矿井顶板含水层疏降周期会比较长。

Researched hydrogeological characters of coal seam roof aquifers in the first mining area of Yuandatan coal mine. The results showed that the height of water flowing fractured zone could reach the upper Zhiluo formation when No.2 coal seam was mined, and the fractured zone could not reach the Quaternary aquifer. There were some relative confining beds with good water resistant capacity between the Zhiluo formation and the Quaternary aquifer. Because the water resistant capacity of fine sandstone and siltstone was very good, the hydraulic connection was also poor between the Zhiluo formation and the coal bearing formation. The recharge condition and runoff condition were good in the upper aquifers(e.g. the Quaternary aquifer), and groundwater circulation was actively. Runoff condition was poor in the lower aquifers(e.g. the Zhiluo formation). Groundwater could be easily drained from coal roof aquifers, but the permeability coefficient was small, and water permeability of roof aquifer was poor.The drainage of coal roof water needed longer period.