Abstract
The loss of water resources caused by mining fissures is a key factor restricting the green development of coal resources in western mining areas. in order to analyze the influence of mining thickness and face width on the development height of water diversion fracture zone, based on the characteristics of overburden in Xinzhuang Coal Mine, the finite difference software FLAC3D is used to simulate and analyze the size effect of water diversion fracture zone height. The simulation results show that the height of the water diversion fracture zone is positively correlated with the increase of mining thickness and working face width. When the mining thickness is 9m and the width of the working face is 240m, the height of the water diversion fracture zone is 115m, and the average distance between the coal layer 8 of Xinzhuang Coal Mine and the bottom of the Cretaceous aquifer is 106.9m, which may cause water inrush in the mine. Therefore, according to the simulation results and referring to the mining size of part of the mine face in the attached Binchang mining area, it is suggested that the mining thickness of Xinzhuang Coal Mine is about 10m and the width of the working face is not more than 200m.
Highlights
The water diversion fracture zone is the channel of underground water and gas migration [1,2]
Previous studies have found that the development of water-conducting fracture zone is the result of the joint action of many factors such as mining size and overlying rock properties [5,6], in which mining thickness and working face width are important main / controllable factors [7,8]
The main results are as follows: (1) under the condition of mining thickness of 3m, after pushing 300m, the height of the plastic failure zone of the roof develops to 58m above the roof, and the development height of the water diversion fracture zone does not develop to the aquifer of the Cretaceous Luohe formation of the roof, as shown in figure 2
Summary
The water diversion fracture zone is the channel of underground water and gas migration [1,2]. Previous studies have found that the development of water-conducting fracture zone is the result of the joint action of many factors such as mining size and overlying rock properties [5,6], in which mining thickness and working face width are important main / controllable factors [7,8]. It can be adjusted and optimized continuously with coal mining. How to select the appropriate mining thickness and face width under complex conditions will be the key to effectively control the stability of roof aquifer and ensure the safety of mine production
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