大佛寺煤矿复合煤层开采覆岩破坏规律与水害形成机理  

The Failure Law of Overburden Rock and the Formation Mechanism of Water Damage in the Composite Coal Seam Mining of Dafosi Coal Mine

作　　者：孙学军 汪庆国 刘孟辉 Sun Xuejun;Wang Qingguo;Liu Menghui(Shaanxi Binchang Dafosi Mining Industry Co.,Ltd.,Shaanxi Xianyang 713500)

机构地区：[1]陕西彬长大佛寺矿业有限公司,陕西咸阳713500

出　　处：《山东煤炭科技》2023年第11期125-129,共5页Shandong Coal Science and Technology

摘　　要：为探究大佛寺煤矿复合煤层开采过程中脉冲性涌水机理,通过监测周期来压、钻孔水位变化、钻孔水化学成分与涌水量关系,判断岩层涌水位置,利用相似模拟方法对覆岩离层规律进行表征。结果表明:周期性的导水裂隙带导通与闭合是导致脉冲性涌水的关键,导水裂隙带在洛河组含水层内部的发育高度约为孔深157 m。工作面异常涌水主要来源于洛河组含水层。相似模拟试验验证了4_(上)煤开采的裂隙具备导通洛河组含水层的能力,得出了洛河组地层周期性断裂步距约为4~6个周期来压。水害形成机理是4_(上)煤开采导通洛河组含水层,4煤含水层覆岩周期性破断释放静储量,隔水层重新压实封闭导水裂隙,最终形成脉冲性涌水。In order to explore the mechanism of pulsed water gushing during the mining process of composite coal seams in Dafosi Coal Mine,the location of water gushing in rock layers is judged by monitoring the periodic pressure,changes in borehole water level,relationship between chemical composition of borehole water and water yield.Similar simulation methods are used to characterize the overlying rock separation layer law.The results indicate that the continuity and closure of periodic water conducting fracture zones are the key factors leading to pulsed water gushing.The development height of water conducting fracture zones within the Luohe Formation aquifer is approximately 157 m hole deep.The abnormal water gushing in the working face mainly comes from the aquifer of the Luohe Formation.Similar simulation experiments verified that the cracks of the 4_(upper) coal mining have the ability to guide the aquifer of the Luohe Formation,and it is found that the periodic fracture step distance of the Luohe Formation stratum is about 4-6 cycles of periodic pressure.The mechanism of water damage formation is that the 4_(upper) coal mining leads to the Luohe Formation aquifer,and the 4 coal aquifer's overlying rock periodically breaks and releases static reserves.The impermeable layer recompacts and seals the water conducting cracks,ultimately forming pulsed water gushing.

关 键 词：脉冲性涌水 覆岩破坏 水害防治 水害机理 

分 类 号：TD745[矿业工程—矿井通风与安全]