Results 21 to 30 of about 15,213 (255)
Sustainability, 2022 In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal ...
Chaowen Hu +5 more
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Geofluids, 2020 The compound dynamic disaster of coal and gas outbursts and rockburst is a typical hazard jeopardizing the mining of the high gas content coal seam under a hard roof condition.
Litong Dou +3 more
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Meitan xuebao, 2023 In the engineering practice of gob side entry retaining by roof cutting, the height and angle of roof cutting are the direct influencing factors, and the reasonable roof cutting parameters allowed by the hard roof with a wide range of roof thickness change have their particularity.
Xuhui XU +5 more
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Development status and Prospect of directional hydraulic fracturing technology for coal mine roof [PDF]
E3S Web of Conferences, 2020 Aiming at the harm and control methods of thick and hard roof in coal mine, the paper firstly analyzes the advanced control methods of thick and hard roof, such as directional shaped charge blasting roof control technology, hydraulic fracturing roof ...
Liangwei LI
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Scientific Reports, 2023 Based on the disaster characteristics and the geo-conditions at the scene, in this study, the occurrence mechanism of a serious rock burst accident that occurred in the Tangshan Coal Mine, China, was analysed.
Ying Chen +5 more
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Study of Reasonable Hanging Roof Length on Hard Roof
Procedia Engineering, 2011 AbstractThe thesis, from the character of hard roof on longwall working face, moving character and control request, by establishing mechanical model and theoretic deduced method, achieves supporting strength of the breaker props and pressure interval control under the control of hard roof on longwall working face, and therefore realizes managing the ...
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Meitan kexue jishu, 2023 The mining of extremely thick coal seam form a large space stope, the fracture disturbance of hard roof spreads to a wide range, the working face weighting has the characteristic of “strong mine pressure”, it is obviously different from rock burst ...
YU Bin +3 more
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Support Roof Interaction Under Lower Hard Roof Conditions in Longwall Mining
MathematicsHard roofs in longwall mining may form large, suspended strata, which induce strong abutment stress redistribution. Therefore, a rational face support design is essential for ground control. This study develops an analytical numerical framework to evaluate support roof interaction under hard roof conditions.
Jie Zhang +6 more
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Unloading-slippage mechanism of coal bump in gateroad of longwall
Geohazard Mechanics, 2023 Coal bump seriously threatens the safe and efficient mining of coal, and the research on the occurrence mechanism of coal bump is of great significance. The roadway coal bump accounts for 86.8% of the total.
Jun Han +5 more
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Gong-kuang zidonghuaThe interactions within the composite hard roof structure above coal seams are highly complex, making it challenging to identify the main controlling layers for pressure relief via hydraulic fracturing. Using the 31104-1 working face of the Nalinhe No. 2
LI Yanjun
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