地电场监测在预防祁东煤矿7130工作面顶板突水中的应用

Application of ground electric field monitoring in prevention of roof water inrush in 7130 working face of Qidong coal mine

水源为"四含"的顶板水是祁东煤矿7130工作面安全生产的最大危险源。煤矿开采会形成顶板岩层破裂带,其电性会发生显著的变化,通过监测电阻、激励电流和自然电位的的变化,发现其与顶板出水水量和老塘水涌水量之间存在一定的对应关系。通过祁东煤矿地电场监测试验表明,顶板水害是可以超前预测的,其中自然电位的超前预警量最高达25天,最低为5天,激励电流的超前预警量最高达26天,最低为2天。这种预测方法对其他受顶板水害威胁的煤矿预防顶板水害具有借鉴作用。

Roof water source for the ＂ four- containing＂ is the the largest sources of danger that threat 7130 Face in Qidong Coal Mine＇s Safety Production. Mining will form the the rupture zones of roof strata,it＇s electrical properties will change significant. By monitoring the changes of resistance,excitation current and natural potential,we found that there is a certain corresponding relation between the roof water inrush quantity and goaf water inflow. Through the monitoring tests in Qidong Coal Mine,it shows that the roof water damage is can be predicted,the amount of advance warning of natural potential is up to 25 days,a minimum of 5 days and the exciting current is up 26 days,a minimum of two days. This prediction method can be referenced to other coal mine to prevent roof water flood threats.