矿井顶板水探测方法及富水区成因分析

某矿1303工作面为三采区首采工作面,顶板含水层主要为第四系含水层、K10和K8砂岩裂隙含水层。为了解顶板K10和K8砂岩裂隙含水层的富水性,在1303工作面运输巷布置了覆盖全工作面的10个钻场(46个顶板探放水钻孔)进行探测,结合地表钻孔的顶板覆岩规律以及抽水试验结果可知,K10和K8砂岩裂隙含水层属于弱富水含水层,在2号钻场和8号钻场周边局部存在局部富水区;局部富水区均与构造有关,2号钻场位于背斜翼部,8号钻场位于向斜轴部,而背斜翼部和向斜轴部易出现砂岩裂隙带,成为地下水的富集区。

Mine roof water detection method and cause analysis of rich water area

The 1303 working face of a mine is the first working face in the third mining area.The top aquifer is mainly quaternary aquifer,K 10 and K 8 sandstone fracture aquifer.The quaternary aquifer has no roof water hazard.To understand water abundance of K 10 and K 8 aquifer,Ten drilling fields(46 roof drain borehole drilling)covering the whole working face were arranged in the transportation roadway of 1303 working face.Combined with the surface borehole regularity of roof strata and pumping,the borehole drilling test result showed that the weak K 10 and K 8 sandstone fissure aquifer belongs to weakly rich aquifer,and there are local rich water areas in the No.2 and No.8 drilling field.The local rich water area is related to the structure.The No.2 drilling field is located in the anticlinal wing and the No.8 drilling field is located in the synclinal axis.However,sandstone fracture zone is easy to appear in the wing of anticline and the axis of syncline,which becomes the enrichment area of groundwater.