煤矿导水裂隙带发育高度分析-基于模拟和实测相结合方法

Analysis of the development height of water-conducting fissure zones in coal mines based on a combination of simulated and measured methods

综放工作面导水裂隙带发育高度关系到煤矿防水治理、采空区上隅角及回采巷道瓦斯治理、煤气共抽采、水下采煤等工作,为研究综放工作面导水裂隙带的发育高度,以李家窑煤矿82210工作面为研究对象,通过理论计算、数值模拟和现场探测等手段,综合分析了工作面软覆层导水裂隙带的最大高度和发育位置,计算得工作面导水裂隙带高度分别为48.3~60、46、45.54 m和46.4~47.2 m,现场检测和数值模拟的导水裂隙带最大高度在理论计算的取值范围内;而当工作面宽度为80 m时,导水裂隙带的发育高度仅为24 m,与现场观测得到的导水裂隙带最大高度(45.54 m和46.4~47.2 m)相差较大,说明增大工作面尺寸可以改变覆岩的开采程度,从而改变覆岩的结构特征,增加导水裂隙带发育高度。

The development height of the hydraulic fracture zone in the face is related to the waterproof management of the coal mine,gas management of the upper corner of the mining hollow area and the roadway,gas co-extraction,underwater coal mining,etc.In order to study the development height of the hydraulic fracture zone of the face,we take the 82210 face of the LiJiayao Mine as the object of the study,and comprehensively analyze the maximum height and the development location of the soft and overburden hydraulic fracture zone of the working face by means of theoretical calculations,numerical simulations and on-site probing,respectively.By means of theoretical calculation,numerical simulation and on-site detection,we comprehensively analyzed the maximum height and development location of the water-conducting fissure zone in the soft overburden of the working face,and calculated the heights of the water-conducting fissure zone in the working face to be 48.3~60,46,45.54 m and 46.4~47.2 m,respectively.The difference with the maximum height of the water-conducting fissure zone obtained from field observation(45.54 m and 46.4~47.2 m)is large,which indicates that increasing the size of the working face can change the mining degree of the overlying rock,thus changing the structural characteristics of the overlying rock and increasing the height of the water-conducting fissure zone development.