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

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.