Studying the feature of overlying rock failure and the height of water-conducting fracture zone after coal seam mining is the foundation for the source reduction design and differentiated surface ecological restoration. Taking the typical working face of Shendong Shigetai Mine as the engineering background,an independently developed simulation testing platform was used to study the characteristics of overlying rock failure and its self-healing after multi-seam coal mining. The relationship between height of water-conducting fracture zone and the width-to-depth ratio and depth-to-thickness ratio of the working face was revealed. A prediction formula of the height of water-conducting fracture zone was also proposed. The results showed that the overlying rock failure characteristics weresimilar to those of a single coal seam during the mining of 2-2 coal seam. During 3-1 coal seam mining,the rock layer between the two coal seams was severely damaged and the fractures were developed extensively due to the relatively thick coal seam. It caused secondary disturbance and damage in the overlying rock layers of the 2-2 coal seam,with further development of fractures. The degree of self-healing of rock fractures between two coal seams and at the boundary of the mining area was relatively low,making it difficult to self repair. The height of water-conducting fracture zone in Shendong Mining Area tended to decrease with the width-to-depth ratio,and it increased with the depth-to-thickness ratio,which had been verified using the measured data.
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