超大采高工作面顶板基岩含水层富水性探测与处理技术

Detection and treatment technology of water-rich properties of bedrock aquifer in roof of workface with super-large mining height

为了解决郝家梁煤矿顶板及周边烧变岩含水层对7m超大采高工作面安全开采的影响问题,根据基岩含水层的赋存条件,提出"地面物探+井下钻探"的联合探放水方案。地面瞬变电磁物探在工作面范围圈出两处富水异常区,一处为两巷基岩风化带富水区,另一处为初采期工作面顶板基岩含水层与烧变岩含水层导通区。基于物探结果布置了井下钻孔,基岩风化带富水区存在两个涌水量较大的钻孔,初采期存在一个涌水量较大的钻孔,富水区的实际位置符合物探结果,验证了瞬变电磁探测成果的准确性,为首采工作面的安全开采奠定了基础。

In order to solve the influence of burnt rock aquifer of workface roof on the safe mining of the 7 m super-large mining face in Haojialiang Coal Mine,based on the occurrence state of bedrock aquifer,the combined treatment technology of ground geophysical prospecting and underground drilling was proposed.Two water-rich abnormal areas were detected,which located respectively in water-rich zone of weathering zone of the two roadways and in the relation zone of roof bedrock aquifer and burnt rock aquifer in the initial workface.According to the geophysical detection results,drilling holes were arranged.The drilling results showed that there were two boreholes with large water inflow in the bedrock weathering zone and one borehole with large water inflow in the initial mining period.The actual location of the water-rich area was consistent with the geophysical detection results,which verified the accuracy of transient electromagnetic detection technology and established a foundation for safe mining of the initial working face.