Study on crack propagation law of overlying strata in the process of small coal pillar mining in inclined extra-thick coal seam [PDF]
Scientific ReportsAiming at the problem of unclear crack propagation law of overburden rock in the process of small coal pillar mining in inclined extra-thick coal seam, this paper takes the 11,002 working face of Tengda Coal Mine in Heze, Xinjiang as the background ...
Weidong Lu +5 more
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Mechanical Analysis of the First Fracture Characteristics of Hard Roof of Extra-thick Coal Seam
Meikuang Anquan, 2020 In order to investigate the failure mechanisms of the hard roof in the fully mechanized caving face in the extra-thick coal seam, the mechanical analysis model of the first breaking of the hard top roof in the fully mechanized caving mining of the extra-
LIANG Shaping, LU Yinlong, GUO Peng, WU Bingzhen
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Effect mechanism of strata breakage evolution on stope deformation in extra-thick coal seams
Alexandria Engineering Journal, 2022 The mining of extra-thick coal seams features severe deformation of the stoping roadway and section coal pillars due to the large mining thickness of the coal seams and the intense movement of the overlying strata.
Cunli Zhu +5 more
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Research on the technology of unloading pressure and preventing punching in extra-thick coal seams. [PDF]
Sci RepThis study addresses stress concentration in roadways and elastic energy accumulation in the cantilever beam of hard roofs within the goaf of extra-thick coal seams. Using the 61,607 working face of Longwanggou Mine as a case study, the key roof layer was identified through theoretical calculations, and hydraulic fracturing parameters were optimized ...
Zhang L, Deng Z, Li G, Liu G, Lian X.
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Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof. [PDF]
Sci RepThick-hard roof fracturing presents a significant challenge for disaster prevention in longwall mining. This study investigates the 15,311 south working face and develops a mechanical model to analyze energy release during both initial and cyclic roof fracturing, along with the associated disaster mechanisms.
Wang R +4 more
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The Safety Guarantee Technology of Extra-thick Coal Seam Mining in Tashan Coal Mine
Procedia Engineering, 2011 AbstractIn recent years, a series of gas and spontaneous fire prevention technologies are summarized by Tashan coal mine of Datong Coal Mine Group CO.,LTD, which are suitable for extra-thick coal seam mining of carboniferous period through collaborative investigation of industry-university-institute and engineering practice.
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Research on bending-slip rib spalling and rib stability of extra-thick hard coal wall [PDF]
Scientific ReportsIn response to the frequent occurrence of coal face spalling affecting the working face production during the mining of extra-thick hard coal seams, this study investigates the characteristics of typical hard coal face damage.
Bo Xue +4 more
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Numerical simulation on fracturing behaviour of hard roofs at different levels during extra-thick coal seam mining [PDF]
Royal Society Open Science, 2020 Rui Gao
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Applied SciencesChannel wave seismic activity often occurs with thin and medium-thick coal seams being the main target layer. To address the problem of channel wave applicability detection in extremely thick coal seams, the propagation and identification characteristics
Tao Ding +5 more
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Failure Mechanism and Risk Evaluation of Water Inrush in Floor of Extra-Thick Coal Seam
Water (Switzerland)In this paper, we investigate the evolution characteristics of floor failure during pressured mining in extra-thick coal seams. A mechanical expression relating floor failure depth to seam thickness is established based on soil mechanics and mine pressure theory.
Shangxian Yin, Min Cao
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