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Safety and high-recovery mechanisms and application research for initial mining of thick-coal-seam with complex structure and thick-hard roof [PDF]
Scientific ReportsThick-coal-seam with complex structures and thick-hard roof in the initial mining phase pose various challenges, including a long weighting interval, strong rock pressure, poor top coal caving performance (TCCP), and significant coal loss. These problems
Zechao Chang +7 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 ...
Qingwei Bu +5 more
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Energy Exploration & 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, Bing Wang
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Study on Fracture Behavior of Directly Covered Thick Hard Roof Based on Bearing Capacity of Supports
Applied Sciences, 2023 Mine pressure at the working face is severe due to it being directly covered by a thick hard roof. To further investigate the technology of controlling the mine pressure of a thick hard roof, the upper working face of 13,121 in Gubei mine of Huainan ...
Jiawen Li +4 more
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Frontiers in Earth ScienceRockburst prevention poses a major challenge in coal mining, with thick and hard roof strata being the primary cause of rockbursts. To analyze the feasibility and effectiveness of using hydraulic fracturing as an alternative to blasting methods for ...
Kunlun Liu +8 more
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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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Geofluids, 2021 As an extra-thick hard roof is a significant contributing factor to frequently induced sudden roof collapse accidents and coal bursts, this study investigates the relationship between extra-thick hard roof movement and mining-induced stress using ...
Hongwei Wang +5 more
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Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesThe mining of deep large-height longwall faces leads to frequent occurrences of strong ground pressure, at the same time, there are multi-thick hard rock strata in the roof of the longwall face, therefore, it is important to master the fracture ...
Yangbo Lu +4 more
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Reasonable drilling angle and technology application for pre-cracking thick-hard roofs before driving gob-side roadways in ultra-thick seams [PDF]
Scientific ReportsTo address the challenges of controlling the surrounding rock deformation in gob-side roadways caused by thick and hard roof suspension in ultra-thick coal seams, a pre-cracking roof pressure relief technique before roadway excavation is proposed ...
Fulian He +4 more
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Scientific ReportsThick-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 ...
Rui Wang +4 more
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