山西古交屯兰煤矿8号煤层带压开采评价

Coal No.8 Mining under Aquifer Safe Water Pressure Assessment in Tunlan Coalmine,Gujiao Mining Area,Shanxi

古交矿区下组煤的开采深受中奥陶统灰岩含水层的威胁,存在严重的带压开采问题。以山西屯兰煤矿带压情况为例,通过分析煤层底板隔水层厚度及采动破坏程度深度,对矿井突水情况进行了研究,并利用“五图—双系数”法对煤矿突水情况进行评价。结果显示:井田内奥灰水位标高为830~918.75m,8号煤层全部属带压开采。确定了奥灰水是矿井主要充水水源之一。采用突水系数和断裂构造发育规模两项指标进行带压开采安全性分区,为矿方生产提供了技术指导。

Extraction of lower group coal seams in the Gujiao mining area is deeply threatened by middle Ordovician limestone aquifer with serious mining under aquifer safe water pressure issue.Taking the Tunlan coalmine in the mining area mining under water pressure as an example,through coal floor aquifuge thickness and mining destruction degree and depth analysis,has carried out mine water bursting status study.Using“five diagrams and two coefficients”* method carried out coalmine water bursting status assessment.The result has shown that Ordovician limestone aquifer water table elevation is 830~918.75m,the mining of coal No.8 totally belongs to mining under aquifer safe water pressure.Ordovician limestone aquifer water is one of main mine water filling sources.Using two indices of water bursting coefficient and faulted structure development scope have carried out mining under aquifer safe water pressure security partitioning and provided technical guidance for coalmine side in production.