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Timely roof breaking and pressure relief technology by hard roof staged fracturing [PDF]
AIP AdvancesHard roofs in longwall mining often generate large roof caving steps during initial weighting and form extended hanging roofs during periodic weighting. These phenomena can lead to sudden cave-ins, rock bursts, and mine seismicity.
Kaige Zheng
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Study on the dynamic response and roadways stability during mining under the disturbance of hard roof break [PDF]
Scientific ReportsUnder the condition that the working face was directly covered with hard roof, the abrupt breaking of hard roof release significant amount of energy, thus prone to triggering dynamic disasters such as roadway instability or rockburst. This paper based on
Kong Peng +4 more
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Frontiers in Earth Science, 2022 Aiming at the mining disaster of a thick hard roof, based on the analysis of the mining instability influence of the thick hard roof, this study constructs the mining bearing mechanical model of the thick hard roof by using mechanical theory and obtains ...
MIn TU, Qingwei BU
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Energy Exploration and Exploitation, 2022 A thick-hard roof implies a large hanging-roof and high-frequency dynamic strata behaviour during mining, which may jeopardise personnel safety and equipment.
Baobao Chen, Changyou Liu
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Application of pre-splitting blasting roof-cutting pressure relief technology for roadway protection under hard roof. [PDF]
Sci RepThe 360,606 working face of Xinji 1# Mine was taken as an engineering case to address the significant safety hazards associated with coal mining under hard roof. A key technical scheme for pre-splitting blasting roof-cutting pressure relief was developed by theoretical analysis, numerical simulation, and field experiments.
Li Y, Chang G, Hu D, Song W.
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Influence mechanism of thick hard layer on fracture and energy release characteristics of composite roof [PDF]
Scientific ReportsInvestigating the instability and energy release characteristics of layered roof structures is crucial for elucidating the mechanism of rockburst induced by strata fracture.
Xiao-shuai Song +5 more
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Energy Exploration and Exploitation, 2020 After mining the upper-goaf side, large coal pillars and part of hard roof exposed above the pillars remain. The hard roof can significantly deform the roadway by transferring high stress through coal pillars to the roadway. This paper reports the use of
Jiangwei Liu, Xuehua Li, Changyou Liu
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Directional hydraulic fracturing to control hard-roof rockburst in coal mines
International Journal of Mining Science and Technology, 2012 Abstract Hard roof is the main factor that induces rock-burst. In view of the present obvious weakness of control measures for hard roof rockburst in domestic collieries, the mechanism and field application of directional hydraulic fracturing technology for rock-burst prevention have been investigated in this paper using theoretical analysis and ...
Hu HE, Linming Dou
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Frontiers in Earth Science, 2022 The hard roof of coal mines has the characteristics of high hardness, good integrity, and large layer thickness, which leads to many ground control problems.
Zhijie Zhu +3 more
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Meitan xuebao, 2023 The stope space, after mining an extra-thick coal seam with hard roofs, is large, and its law of mining pressure is complex. The mechanism of strong mine pressure action for this stope is unclear, and there is a lack of multi-point control technology ...
Bin YU +7 more
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