Temporal and spatial evolution law of microseisms and induced impact mechanism in complex spatial structure area of steep and extremely thick coal seam

被引：0
|
作者：
Cui F. [1 ,2 ,3 ]
Zhang S. [1 ,2 ]
Liu X. [4 ]
Lai X. [1 ,2 ]
Ji S. [1 ,2 ]
Feng P. [4 ]
Jia C. [1 ,2 ]
Lu C. [1 ,2 ]
Wang H. [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 Ministry of Education, Xi’an University of Science and Technology, Xi’an
[3] Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an
[4] Wudong Coal Mine, CHN Energy Xinjiang Energy Co., Ltd., Urumqi
来源：
Meitan Xuebao/Journal of the China Coal Society | 2024年 / 49卷 / 04期
关键词：
complex spatial structure; rock burst; steep and extremely thick coal seam; Temporal and spatial evolution law of microseisms;
D O I：
10.13225/j.cnki.jccs.2023.1477
中图分类号：
学科分类号：
摘要：
The occurrence of coal mine rock burst disasters is closely related to the spatial structure, especially in the complex spatial structure area. It is of great significance to master the law of coal and rock catastrophe and reveal its mechanism in the complex spatial structure area of coal seam mining for the prevention and control of rock burst. Taking the Wudong Coal Mine as the research background, using numerical simulation, micro-seismic monitoring, theoretical analysis and other methods, the abnormal size effect of rock pillar stress is studied, the temporal and spatial evolution law of microseisms in the complex spatial structure area is analyzed, the mechanism of rock burst under the complex spatial structure is revealed, and the impact risk in the different areas of coal mining is evaluated. The research results show that: ① The steeply inclined rock pillar with narrower thickness and higher exposed height has stronger prying effect, and the abnormal stress of rock thickness variation forms five divisions. ② The area with narrower rock pillar thickness has more micro-seismic frequency, higher energy, stronger spatio-temporal activity and higher dispersion. The high stress region, the stress gradient region and the stress plateau region show the micro-seismic response characteristics of “low frequency-high energy”, “high frequency-high energy” and “low frequency-low energy” in turn. ③ The micro-seismic events in special spatial structure area are clustered and the energy level increases, and the temporal and spatial activity and dispersion increase sharply. This feature is more obvious especially at the edge of the structure, the energy accumulation and release rate increases, and the probability and intensity of rock burst are higher. The micro-seismic activity of special spatial structures located in the narrower area of rock pillars is more acute. ④ The narrower the thickness of rock pillar (the greater the height of coal pillar), the faster the growth rate of bending moment and energy in the depth of rock pillar, and the higher the impact risk. According to the strength effect of structural plane, it is inferred that the fault zone has slip and dislocation, and fault zone is the dominant area for energy accumulation and release. It is revealed that the mechanism of rock burst is the joint action of high static load and low critical load. The impact risk in the different areas of coal mining is evaluated based on stress concentration characteristics. © 2024 China Coal Society. All rights reserved.
引用
收藏
页码：1786 / 1803
页数：17
相关论文
共 41 条
  • [1] JIANG Yaodong, PAN Yishan, JIANG Fuxing, Et al., State of the art review on mechanism and prevention of coal bumps in China[J], Journal of China Coal Society, 39, 2, pp. 205-213, (2014)
  • [2] (2002)
  • [3] QI Qingxin, WANG Shouguang, LI Haitao, Et al., Stress flow theory for coal bump and its numerical implementation[J], Journal of China Coal Society, 47, 1, pp. 172-179, (2022)
  • [4] PAN Yishan, XIAO Yonhao, LUO Hao, Et al., Study on safety of rockburst mine[J], Journal of China Coal Society, 48, 5, pp. 1846-1860, (2023)
  • [5] DOU Linming, HE Hu, HE Jiang, Et al., New method of rock burst risk assessment using relative stress concentration factor superposition[J], Journal of China Coal Society, 43, 2, pp. 327-332, (2018)
  • [6] JIANG Fuxing, SHU Couxian, WANG Cunwen, Impact risk appraisal of stope working faces based on stress superimposition[J], Chinese Journal of Rock Mechanics and Engineering, 34, 12, pp. 2428-2435, (2015)
  • [7] TAN Yunliang, ZHANG Xiufeng, XIAO Ziyi, Et al., Analysis of main control factors of rock burst and disaster mechanism[J], Journal of China Coal Society, 49, 1, pp. 367-379, (2024)
  • [8] CAO Anye, BAI Xianxi, CAI Wu, Et al., Mechanism for stress abnormality and rock burst in variation zone of roof-stratum thickness, Chinese Journal of Geotechnical Engineering, 45, 3, pp. 512-520, (2023)
  • [9] ZHAO Tongbin, GUO Weiyao, TAN Yunliang, Et al., Mechanics mechanism of rock burst caused by mining in the variable region of coal thickness[J], Journal of China Coal Society, 41, 7, pp. 1659-1666, (2016)
  • [10] ZHU G G, DOU L M, LI Z L, Et al., Mining-induced stress changes and rock burst control in a variable-thickness coal seam[J], Arabian Journal of Geosciences, 9, 5, (2016)
12345