Results 21 to 30 of about 1,364 (186)
Control of the Chamber in Extra‐Thick Coal Seam Based on Fracture Characteristics of Coal Rock and Mass [PDF]
Advances in Civil Engineering, 2020 As the development characteristics of cracks of the chamber are closely related to the bolt and cable anchoring parameters, the original rock stress of the surrounding rock, and fracture degree, this paper proposes the control method for chamber in extra‐thick coal seam by the crack development characteristics.
Yang Tai +4 more
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E3S Web of Conferences, 2018 Some coal seams belong to cretaceous strata in the east of Inner Mongolia, China. There are obvious differences of rock characteristics and mechanical properties between Cretaceous and Carboniferous- Permian strata. The overburden failure characteristics
Li Jianghua, Lian Yuguang, Li Hongjie
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Mining technology and practice of full-solid waste cemented backfilling in narrow strip of extra-thick coal seam under buildings [PDF]
Meitan kexue jishuThere is a great amount of coal pressed under buildings in our country, while the discharge of coal-based industrial solid wastes such as coal gangue and fly ash are increasing, which has severely restricted the local economic and social development ...
Lang LIU +6 more
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Study on the mechanism and prevention techniques of dynamic disaster in nearly vertical extra-thick coal seams. [PDF]
Sci RepTo address the issues of complex rock mass movement and dynamic disasters during the mining of near-vertical extra-thick coal seams, this study takes the + 425 level B3 + 6 working face of Wudong Coal Mine as the research background, aiming to investigate the mechanism of dynamic disasters.
Zhang Y +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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Advances in Civil Engineering, 2020 Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal ...
Fulian He +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.
europepmc +4 more sources
Geofluids, 2021 The stratified mining of super thick coal seam is a process of repeated disturbance of the top roof, especially in the lower stratification, the upper complex rock layer has a greater settlement space, resulting in great changes in the strata structure ...
Qin Guangpeng +4 more
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Geofluids, 2021 In order to reveal the evolution law of gas discharge of carbon monoxide in mining an extra-thick coal seam of the Datong mining area by the numerical simulation and field monitoring test, the 8202 working face and 8309 working face in the Tongxin coal ...
Zhanyuan Ma, Feng Du
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EnergiesUpper protective layer (UPL) mining is extensively utilised as a pressure relief strategy to prevent outbursts and coal bursts. However, when the excavation height of the protected layer is substantial, the depressurisation efficacy of the protective ...
Yanjiang Chai +5 more
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