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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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A case study of the periodic fracture control of a thick-hard roof based on deep-hole pre-splitting blasting [PDF]
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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Ground control strategies for longwall top-coal caving panel in extra-thick coal seams with thick-hard roof [PDF]
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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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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矿业科学学报, 2021 Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement ...
Wang Hongwei +5 more
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Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof
Energies, 2021 This article introduces a new non-pillar coal mining technology (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) under the condition of thick and hard roofs.
Xiaoyu Liu +3 more
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Applied SciencesThis study aims to address the pronounced stress concentration in roadway-surrounding rock under conditions of multiple thick and hard roof strata at Xiao jihan coal mine, China.
Hui Liu +5 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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Applied Sciences, 2021 The higher strength of a hard roof leads to higher coal pressure during coal mining, especially under extra-thick coal seam conditions. This study addresses the hard roof control problem for extra-thick coal seams using the air return roadway 4106 (AR ...
Zhe Xiang +4 more
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