青龙寺煤矿5^-2煤导水裂隙带发育高度物理相似模拟研究

Study on physical similarity simulation of the development height of water-conducting fracture zone of 5^-2 coal in Qinglongsi coal mine

为研究青龙寺煤矿5^-2煤煤层开采导水裂隙带发育高度,以5^-20101工作面为研究对象,以理论计算方法初步确定导水裂隙发育高度、物理相似模拟方法分析煤层开采后覆岩导水裂隙发育高度和破坏规律、现场井下仰孔注水测漏法实际观测以验证实验数据的有效性,综合分析以上数据得出52煤覆岩导水裂隙发育高度和垮落高度,最终确定矿井导水裂隙发育高度为52.3-62m(平均57.2),裂采比取24.2。结果表明,矿井5^-2煤所在采区导水裂隙发育不会和萨拉乌苏组含水层贯通,矿井在生产过程中不受含水层倒灌威胁。

In order to study the development height of water-conducting fracture zone in the 5^-2coal seam mining of Qinglongsi coal mine,the 5-20101 working face is taken as the research object.Firstly,the development height of water-conducting fracture is preliminarily determined by theoretical calculation method.Then the development height and failure law of water-conducting fracture in overlying rock after coal mining are analyzed by physical similarity simulation method.In order to verify the validity of the experimental data,the in-situ down hole water injection leakage measurement method is used for the actual observation,and the comprehensive analysis of the above data is conducted to obtain the development height and collapse height of water-conducting fractures in 5^-2 coal overlying rocks.Finally,it is determined that the development height of water-conducting cracks in the mine is 52.3-62 m(average 57.2),and the fracture-production ratio is 24.2.The results show that the development of water-conducting fissure in the mining area of 5 coal is located in the mine which will not be connected with the Sarawusu formation aquifer,and in principle,the mine will not be threatened by aquifer recharge in the production process.