顶板多层灰岩含水层音频电透视探查技术应用

Application of Audio Frequency Electric Perspective Exploration Technology for Multi-layer Limestone Aquifer on the Roof

针对工作面顶板多层灰岩含水层在回采时通过导水裂隙带使涌水量异常增大,影响工作面正常回采问题,采用矿井音频电透视技术对工作面顶板上100m范围内富水异常区进行探查,针对不同层段汇演含水层采用不同激发频率探查。通过对青龙煤矿21601工作面探测结果表明:音频电透视120Hz激发频率能很好反映0~50m层段灰岩富水区域分布,15Hz激发频率能很好反映51~100m层段灰岩富水区域分布,利用此技术能提前探明回采工作面顶板上方多层含水层富水异常分布范围,为煤矿防治水提供科学的指导意见,保障矿井的安全生产。

In response to the problem of abnormal increase in water inflow caused by multiple layers of limestone aquifers on the roof of the working face during mining,which affects the normal mining of the working face,the mine audio electric perspective technology is used to explore the abnormal water rich area within 100m of the roof of the working face.Different excitation frequencies are used to explore the convergence of aquifers in different layers.The detection results of the 21601 working face in Qinglong Coal Mine show that the 120Hz excitation frequency of audio electric perspective can well reflect the distribution of water rich areas in the 0-50m interval of limestone,and the 15Hz excitation frequency can well reflect the distribution of water rich areas in the 51-100m interval of limestone.By using this technology,the abnormal distribution range of water rich in multiple layers of aquifers above the roof of the mining face can be explored in advance,providing scientific guidance for water prevention and control in coal mines and ensuring safe production of the mine.