Title: Experimental Study on the effect of long-distance pressure relief and permeability enhancement of cross coal formation with double key layers
Author: He Xiang 1, Yang Ke 2, Yuan Liang 1, 2, Zhang Cun 1, Zhang Tong 3
Author:
1. China University of mining and Technology (Beijing) School of energy and mining, Beijing Key Laboratory of associated energy precision mining, Beijing 100083;
2. School of energy and safety, Anhui University of technology, State Key Laboratory of mining response and disaster prevention and control, Huainan, Anhui 232001
Abstract:
Based on the research background of long-distance pressure relief 4 × coal in 11223 working face of Pan'er coal mine, the methods of physical simulation, FLAC3D fluid solid coupling simulation and field engineering measurement are adopted, This paper analyzes the distribution characteristics of the 4 × coal pressure relief and permeability increasing zone of the remote protected layer and the mechanism of the key layer breaking affecting the effect of the pressure relief gas drainage. The results show that: 1) the distance between the extreme points of the pressure relief gas drainage is consistent with the periodic fracture step of the upper key layer, while the breaking of the lower key layer has no direct impact on the pressure relief gas drainage, The periodic fracture step distance of the upper key layer can predict the peak position of long-distance pressure relief gas drainage; 2) after compaction and deformation, the expansion deformation and permeability of the protected layer are bimodal in the inclined direction of the coal seam, with the largest value in the middle and lower part, the second in the middle and the smallest in the middle; 3) the measured expansion deformation of the 4 × coal seam reaches 1.26%, the pressure relief gas drainage rate is 69.59%, and the permeability of the coal seam expands by 2149 times, It is proved that the remote pressure relief of 3 × 3 coal and 4 × 4 coal is feasible under the engineering geological conditions. Key words: double key layer; remote pressure relief; periodic fracture step; expansion and deformation; permeability reference format in this paper: He Xiang, Yang Ke, Yuan Liang, et al. Pilot study on the remote pressure relief and permeability enhancement effect of double key layer cross Coal Group [J]. Journal of China University of mining and technology, 2020,49 (02): 238-246
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