矿井底板水文地质条件探查及可疏降性评价
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摘要
伊犁一矿位于新疆伊犁州,地表被天山山前冲洪积层覆盖并接受天山雪融水直接补给,与含煤地层不整合接触,且主采煤层底板存在承压含水层,地下水补给、径流条件复杂。针对该矿5#煤层底板侏罗系砂岩含水层富水性中等,且具有承压性等水文地质问题,通过在伊犁一矿试采面5#煤层底板砂岩含水层进行放水试验,获取了该含水层的渗透系数,并对放水试验及水位恢复试验过程进行了分析,结果表明:放水试验形成的降落漏斗明显,疏降效果较好,5#煤层底板砂岩含水层具有良好的可疏降性,试采面通过适当疏降可消除底板砂岩含水层的突水威胁。
Yili No.1 Mine is located in Yili,Xinjiang,the surface of mining area is covered by the Tianshan piedmont alluvial deposit and recharged by Tianshan snow melt water directly,and it has an unconformable contact with coal-bearing stratum.The confined aquifer exists in the floor of the main coal seam,and the conditions of groundwater recharge and runoff are complicated.Aiming at the hydrogeological problems of Jurassic sandstone aquifer in No.5 coal seam floor in this mine,such as medium water abundance and pressure-bearing characteristics,through the water discharge test of the No.5 coal seam sandstone aquifer in the test face of Yili No.1 Mine,the permeability coefficient of the aquifer was obtained,and the water discharge test and water level recovery test process were analyzed.The results showed that the falling funnel formed by the water discharge test was obvious,and the drainage and pressure-relief effects were good.The No.5 coal seam sandstone aquifer had good conditions for water drainage and pressure-relief,and the test mining face could eliminate the water inrush threat of the floor sandstone aquifer by appropriate water drainage.
Yili No.1 Mine is located in Yili,Xinjiang,the surface of mining area is covered by the Tianshan piedmont alluvial deposit and recharged by Tianshan snow melt water directly,and it has an unconformable contact with coal-bearing stratum.The confined aquifer exists in the floor of the main coal seam,and the conditions of groundwater recharge and runoff are complicated.Aiming at the hydrogeological problems of Jurassic sandstone aquifer in No.5 coal seam floor in this mine,such as medium water abundance and pressure-bearing characteristics,through the water discharge test of the No.5 coal seam sandstone aquifer in the test face of Yili No.1 Mine,the permeability coefficient of the aquifer was obtained,and the water discharge test and water level recovery test process were analyzed.The results showed that the falling funnel formed by the water discharge test was obvious,and the drainage and pressure-relief effects were good.The No.5 coal seam sandstone aquifer had good conditions for water drainage and pressure-relief,and the test mining face could eliminate the water inrush threat of the floor sandstone aquifer by appropriate water drainage.
引文
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