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Disaster mechanism and collaborative control technology of multi-field coupling in extra-thick coal seam with hard roof [PDF]
Meitan kexue jishuAddressing the coupled challenges of strong mine pressure and gas, induced by large-span fracture of the hard roof during the mining of thick coal seams, a systematic understanding of the disaster mechanism through multi-field coupling of the hard roof ...
Bin YU +6 more
doaj +2 more sources
Journal of Rock Mechanics and Geotechnical EngineeringDuring fully mechanized caving mining of thick coal seams, a large amount of strain energy accumulates in the roof, especially when the roof is thick and hard, making it difficult for the roof to collapse naturally.
Qi Wang +5 more
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WaterThe collapse of thick-hard roofs after coal has been extracted is not a consequential process in all cases. Rather, it happens due to the augmentation of high stress conducted at depth, followed by a wider range of damage as the floor cracks. The extent and spread of the cracks in the floor indicate the intensity of the collapse, and the mine will be ...
Min Cao +3 more
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ProcessesIn the process of roadway excavation in thick and hard coal seams with a hard roof, the instantaneous release of a large amount of elastic energy accumulated in coal and rock mass causes disasters. Especially under the action of tectonic stress, dynamic disasters of roadway-surrounding rock are extremely strong.
Zhongzong Cao +4 more
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Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesThick hard roof with high strength, large breaking step and strong mine pressure is one of the major problems in coal mine safety production. Aiming at the problems of large thickness, high strength and difficult collapse of the roof slab of Yadian Coal ...
Shuo Ren +6 more
doaj +2 more sources
Meikuang Anquan, 2023 In view of the insufficient pressure relief effect of thick hard roof of 3106 working face in Menkeqing Coal Mine, the key layer inducing roof shock of 3106 working face was determined by the active strata of micro-seismic high-energy events monitored in the field and theoretical analysis.
SUN Ruda, XIA Yongxue, GAO Jiaming
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Ground fracturing pre-control technology for potential mine seismic risk of thick and hard roof
Meitan kexue jishu, 2023 Mines with thick and hard roof face high risks of mine seismic activities and mine pressure during mining, which easily leads to dynamic disasters in mines.
Shuwen WANG +5 more
doaj +1 more source
Research and application of pressure relief technology for fracturing thick hard roof in super-high mining face [PDF]
Meitan xuebaoAiming at the problems of super-large mining space, strong ore pressure and ultra-high coal wall stability control faced by full-mechanized mining face with ultra-large mining height and thick hard roof, this paper takes the 122104 working face of Caojiatan Coal Mine, the world’s first ultra-10 m super-mechanized mining face, as the research background.
Yajun LEI +11 more
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Effect of Thick–Hard Main Roof Fracturing on the Spatiotemporal Evolution of Overburden Fractures
Applied SciencesGas gushing and the co-mining of coal and gas outbursts are common disasters in coal mines. The weakening of thick–hard main roof fracturing can effectively alleviate the gas overrun in the initial mining stage. Four numerical simulation schemes were designed to determine the optimal fracturing treatment scheme for the gas overrun problem in the ...
Jinfeng Ju, Chengen Qi, Zhu Li
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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
doaj +1 more source