Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams

doi:10.1007/s12517-021-08439-8

	Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams
	Wu, Zhenhua 4,5; Pan, Peng-Zhi 4,5; Konicek, Petr 3; Zhao, Shankun 2; Chen, Jianqiang 1; Liu, Xudong 1
刊名	ARABIAN JOURNAL OF GEOSCIENCES
	2021-10-01
卷号	14 期号:20 页码:28
关键词	Rock burst Steeply dipping thick coal seam Adjacent coal seams Microseismic Precursor characteristics
ISSN号	1866-7511
DOI	10.1007/s12517-021-08439-8
英文摘要	Due to the complex geological conditions and special mining approach of the steeply dipping thick coal seam in the south mining area of the Wudong coal mine, dynamic hazards are frequently encountered during horizontal section top-coal caving. Identification of rock burst precursor information can help effectively avoid its occurrence, decrease unnecessary loss, and ensure personal safety of underground workers. The B3+6 coal seam working face of the south mining area of the Wudong coal mine at +475 m level and +450 m level is monitored using a microseismic (MS) monitoring system. The spatial and temporal evolution patterns of MS parameters before rock burst occurrence are investigated and compared with the evolution pattern of precursor characteristics in the gently inclined coal seam. The results show the following data: (1) The daily MS total energy and event count exhibited a sudden decrease and abnormal fluctuation before rock burst occurrence in the steeply dipping thick coal seam of the south mining area of the Wudong coal mine, which can be employed as an effective precursor signal for rock burst early warning. (2) The MS sources were mainly concentrated around the rock pillar, which created a high static stress condition for the occurrence of rock burst and served as the force source of rock burst. The rock pillar was also the main cause of rock burst in the B3+6 coal seam. (3) The MS event aggregation index is defined, which shows sudden fall and rise variation and reaches an extremely low value immediately before the rock burst occurrence. This phenomenon can be considered as a rock burst precursor in the steeply dipping thick coal seam of the south mining area of the Wudong coal mine. (4) For the steeply dipping thick coal seam, the sharp rise and fall of the daily MS average energy does not necessarily mean rock burst occurrence, while the abnormal fluctuation of the daily MS average energy is very likely the precursor of rock burst occurrence. (5) More attention should be paid to the floor (rock pillar) rather than the roof in the study of rock burst in the steeply dipping thick coal seam under similar conditions.
资助项目	State Key Research Development Program of China[2017YFC0804203] ; State Key Research Development Program of China[Z018001] ; State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
WOS研究方向	Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000702467900013
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28552]
专题	中科院武汉岩土力学所
通讯作者	Pan, Peng-Zhi
作者单位	1.Shenhua Xinjiang Energy Co Ltd, Urumqi 830027, Peoples R China 2.China Coal Res Inst, State Key Lab Coal Min & Clean Utilizat, Beijing 100013, Peoples R China 3.Czech Acad Sci, Inst Geon, Dept Geomech & Min Res, Ostrava 70800, Czech Republic 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotechan Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Wu, Zhenhua,Pan, Peng-Zhi,Konicek, Petr,et al. Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams[J]. ARABIAN JOURNAL OF GEOSCIENCES,2021,14(20):28.
APA	Wu, Zhenhua,Pan, Peng-Zhi,Konicek, Petr,Zhao, Shankun,Chen, Jianqiang,&Liu, Xudong.(2021).Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams.ARABIAN JOURNAL OF GEOSCIENCES,14(20),28.
MLA	Wu, Zhenhua,et al."Spatial and temporal microseismic evolution before rock burst in steeply dipping thick coal seams under alternating mining of adjacent coal seams".ARABIAN JOURNAL OF GEOSCIENCES 14.20(2021):28.