浅埋煤层综采面覆岩破坏规律的钻探实测研究

Drilling measured research on overburden failure law in shallow buried longwall face

为研究浅埋综采工作面上覆岩层破坏规律,准确判定采空区冒落带和导水裂隙带的发育高度,以哈拉沟煤矿22208工作面浅埋煤层开采为背景,利用钻孔探测技术对其进行了探测分析。在哈拉沟煤矿22208工作面布置采前、采后钻孔共计8个,利用钻孔冲洗液消耗量观测法和彩色钻孔电视观测法对钻孔进行实测研究,得出切眼中部冒落带发育高度为7.22 m,切眼两端区域冒落带发育高度为13.42 m,切眼中部导水裂隙带发育高度至少为49.32 m,切眼两端区域导水裂隙带发育高度至少为50.82 m。“三元沟”沟底冒落带发育高度为10.1 m,导水裂隙带发育高度至少为25.8 m,“三元沟”出沟区域冒落带发育高度为21.2 m,导水裂隙带发育高度至少为51.6 m。实测结果表明:工作面进回风巷附近和“三元沟”沟底导水裂隙带较发育,是工作面防治水、防溃水溃砂的重点区域,需现场提前采取措施并实时重点监测防护。

The No.22208 working face in Halagou coal mine is taken as the research object to study the overburden failure law in shallow buried longwall face,and determine the development height of caving zone and water flowing fractured zone accurately.The drilling measured technology is applied to reveal the overburden failure law.Eight drilling holes,including drilling holes before and after mining,were arranged in No.22208 working face.The drilling hole fluid consumption observation method and color drilling hole television observation method were used to obtain the development height.The development height of the caving zone in the middle of the cutting hole is 7.22 m,while it is 13.42 m in the cutting hole nearby the roadway;the development height of the water flowing fractured zone in the middle of the cutting hole is larger than 49.32 m,while it is larger than 50.82 m in the cutting hole nearby the roadway.The development height of the caving zone is 10.1 m in the bottom of the Sanyuan Gully,and the development height of the water flowing fractured zone is larger than 25.8 m.The development height of the caving zone is 21.2 m in the out of the Sanyuan Gully,the development height of the water flowing fractured zone is larger than 51.6 m.The in-site measurement results show that the water flowing fractured zone is more developed in the bottom of the Sanyuan Gully or nearby the roadway,which is the key area to prevent water and sand burst,and measures should be carried out in advance as well as monitoring on real-time.