Law of overburden breaking and energy release in the mining of difficult coal resources in steeply inclined extra-thick coal seam group

被引：0
|
作者：
Lai X. [1 ,2 ]
Jia C. [1 ,2 ]
Cui F. [1 ,2 ]
Chen J. [3 ]
Chang B. [3 ]
Zhang S. [1 ,2 ]
Sun J. [1 ,2 ]
机构：
[1] College of Energy Engineering, Xi’an University of Science and Technology, Xi’an
[2] Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an University of Science and Technology, Xi’an
[3] Xinjiang Energy Co.,Ltd., State Energy Group, Urumqi
来源：
Meitan Xuebao/Journal of the China Coal Society | 2023年 / 48卷
关键词：
energy accumulation; mining technology; overburden evolution; rock burst mine; steeply inclined extra-thick coal seam;
D O I：
10.13225/j.cnki.jccs.2022.0623
中图分类号：
学科分类号：
摘要：
Aiming at the problem of safe mining of difficult coal resources in steeply inclined extra-thick coal seam group,using the methods of physical simulation experiment and theoretical analysis,the characteristics of overburden change,breaking height and microseismic energy produced by different mining technologies in steeply inclined extra-thick coal seam group are analyzed and compared. The theoretical calculation formula of energy accumulated by hard roof breaking in steeply inclined extra-thick coal seam is derived,and the comparative analysis results of different mining technologies provide some ideas for the scheme design of deep mining in steeply inclined extra-thick coal seam group. The results show that the central rock pillar of horizontal sublevel fully mechanized top coal caving mining in steeply inclined extra-thick coal seam group is broken intensively to form the linkage effect between the rock pillar and the upper coal seam roof,which is easy to cause dynamic disasters such as rock burst. The strong supporting effect of section coal pillar in longwall mining makes the increase of overburden breaking height and range smaller in the deep mining process of steeply inclined extra-thick coal seam group. By constructing the mechanical model of hard roof breaking in steeply inclined extra-thick coal seam,the calculation formula of hard roof breaking accumulated energy in steeply inclined extra-thick coal seam is derived. The accumulated microseismic energy of steeply inclined extra-thick coal seam group with strike longwall is 24.28Χ105 J,which is 15.67% less than that of horizontal sublevel mining. In the process of horizontal sublevel fully mechanized top coal caving mining,the average energy of single mining is lower than that of longwall mining,and the waste of coal resources due to coal pillar left is avoided. The energy of roof breakage is not fully released,which will easily lead to the peak effect of energy release in the next breakage. Moreover,the large-scale concentrated breakage of the middle rock pillar will easily bring some challenges to the safe production of the mine. Based on the idea of saving coal resources while avoiding a large-scale concentrated breakage of overlying strata,it is suggested that on the basis of the original horizontal sublevel fully mechanized top coal caving mining and roof weakening regulation,the weakening degree of roof and middle rock pillar should be increased to avoid the mine safe production problems caused by the large-scale concentrated breakage of rock pillars. The research results provide a reference for effective utilization and safe mining of coal resources in the steep coal seam with complex conditions. © 2023 China Coal Society. All rights reserved.
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页码：1 / 14
页数：13
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共 32 条
  • [1] XIE Heping, GAO Feng, JU Yang, Et al., Quantitative definition and investigation of deep mining, Journal of China Coal Society, 40, 1, pp. 1-10, (2015)
  • [2] XIE Heping, ZHOU Hongwei, XUE Dongjie, Et al., Research and consideration on deep coal mining and critical mining depth [J], Journal of China Coal Society, 39, 4, pp. 535-542, (2012)
  • [3] HE Manchao, XIE Heping, PENG Suping, Et al., Study on rock mechanics in deep minging engineering [ J ], Chinese Journal of Rock Mechanics and Engineering, 24, 16, pp. 2803-2813, (2005)
  • [4] QI Qingxin, PAN Yishan, SHU Longyong, Et al., Theory and technical framework of prevention and control with different sources in multiscales for coal and rock dynamic disasters in deep mining of coal mines, Journal of China Coal Society, 43, 7, pp. 1801-1810, (2018)
  • [5] ZHAO Shankun, QI Qingxin, LI Yunpeng, Et al., Theory and practice of rockburst stress control technology in deep coal mine [J], Journal of China Coal Society, 45, S2, pp. 626-636, (2020)
  • [6] TAN Yunliang, GUO Weiyao, XIN Hengqi, Et al., Key technology of rock burst monitoring and control in deep coal mining, Journal of China Coal Society, 44, 1, pp. 160-172, (2019)
  • [7] WANG Ningbo, ZHANG Nong, CUI Feng, Et al., Characteristics of stope migration and roadway surrounding rock fracture for fully-mechanized top-coal caving face in steeply dipping and extra-thick coal seam [ J], Journal of China Coal Society, 38, 8, pp. 1312-1318, (2013)
  • [8] DAI Huayang, GUO Junting, YI Sihai, Et al., The mechanism of strata and surface movements induced by extra-thick steeply inclined coal seam applied horizontal slice mining, Journal of China Coal Society, 38, 7, pp. 1109-1115, (2013)
  • [9] SHI Pingwu, ZHANG Youzhen, Structural analysis of arch of spanning strata of top coal caving in steep seam, Chinese Journal of Rock Mechanics and Engineering, 25, 1, pp. 79-82, (2006)
  • [10] WANG Jiachen, ZHAO Bingwen, ZHAO Pengfei, Et al., Research on the longwall top-coal caving mining technique in extremely inclined and soft thick coal seam, Journal of China Coal Society, 42, 2, pp. 286-292, (2017)
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