民兴煤矿煤层底板砂岩含水层水文地质条件分析

Analysis of hydrogeological conditions of sandstone aquifer in coal seam floor of Minxing Mine

近年来,煤层底板砂岩水害问题开始在侏罗纪煤田部分煤矿突显,严重影响了矿井的安全生产和接续计划。基于民兴煤矿1301工作面底板涌水规律和水质化验结果,分析了充水因素,并综合评价了煤层底板含水层的水害威胁情况。研究成果表明,1301工作面的底板涌水主要集中在向斜构造轴部,底板的涌水主要来源于3号煤层直接底板砂岩含水层;矿井主要的充水水源为煤层底板的砂岩含水层水,主要充水通道包括煤层开采扰动形成的顶底板采动裂隙和向斜构造轴部的裂隙发育带;工作面底板涌水是由煤层底板较发育的导/富水砂岩和构造裂隙两者共同作用的结果,且未来接续区域也同样受到底板砂岩承压水的威胁。

In recent years, the problem of sandstone water damage in coal seam floor began to be highlighted in some coal mines in Jurassic coalfield, which seriously affected the safety production and continuation plan of the mine. Based on the floor water inflow law and water quality test results of No.1301 face in Minxing Mine, the water filling factors were analyzed,and the water damage threat of coal seam floor aquifer was comprehensively evaluated. The research results showed that the water inflow from the floor of No.1301 face was mainly concentrated in the axis of syncline structure, and the water inflow from the floor mainly came from the sandstone aquifer of the direct floor of No.3 coal seam. The main water filling source of the mine was the sandstone aquifer water in the coal seam floor. The main water filling channels included the roof and floor mining fissures and the fissure development zone of the syncline structure axis formed by the coal seam mining disturbance.The water inflow in the floor of the working face was the result of the combined action of the more developed water-bearing sandstone and structure fissures in the coal seam floor, and the future continuation area was also threatened by the confined water of the floor sandstone.