Results 11 to 20 of about 139,365 (154)

Analysis of Energy Accumulation and Dispersion Evolution of a Thick Hard Roof and Dynamic Load Response of the Hydraulic Support in a Large Space Stope

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, Qingwei Bu, Min Tu, Xiangyang Zhang, Ming Zhang, Qingchong Zhao   +5 more
doaj   +3 more sources

A case study of the periodic fracture control of a thick-hard roof based on deep-hole pre-splitting blasting

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
doaj   +2 more sources

Influence mechanism of thick hard layer on fracture and energy release characteristics of composite roof [PDF]

Scientific Reports
Investigating 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, Zhi-qi Wang, Peng-fei Zhang, Lei Guo, Tong-bin Zhao, Guo-wen Han   +5 more
doaj   +2 more sources

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, Manchao He, Jiong Wang, Zimin Ma   +3 more
doaj   +3 more sources

Cooperative Control Mechanism of Long Flexible Bolts and Blasting Pressure Relief in Hard Roof Roadways of Extra-Thick Coal Seams: A Case Study

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, Nong Zhang, Zhengzheng Xie, Feng Guo, Chenghao Zhang   +4 more
doaj   +3 more sources

Safety and high-recovery mechanisms and application research for initial mining of thick-coal-seam with complex structure and thick-hard roof [PDF]

Scientific Reports
Thick-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, Xufeng Wang, Dongdong Qin, Jinzhu Yu, Xuyang Chen, Jiyao Wang, Zhijun Niu, Chenlong Qian   +7 more
doaj   +2 more sources

Reasonable drilling angle and technology application for pre-cracking thick-hard roofs before driving gob-side roadways in ultra-thick seams [PDF]

Scientific Reports
To 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, Yanhao Wu, Deqiu Wang, Jianlong Zhang, Kai Tao   +4 more
doaj   +2 more sources

Combined blasting for protection of gob-side roadway with thick and hard roof

Journal of Rock Mechanics and Geotechnical Engineering
The deformation control of surrounding rock in gob−side roadway with thick and hard roof poses a significant challenge to the safety and efficiency of coal mining. To address this issue, a novel approach combining directional and non-directional blasting
Qiang Fu, Jun Yang, Yubing Gao, Changjiang Li, Hongxu Song, Yuxuan Liu, Xing Wu   +6 more
doaj   +3 more sources

Mechanism and prevention of coal bursts in gob-side roadway floor under thick and hard roof in the deep mining area of Ordos

International Journal of Coal Science & Technology
The complex stress environment in deep roadways, often exacerbated by thick and hard strata, frequently precipitates coal bursts, posing significant safety hazards.
Jinlong Zhou, Junfeng Pan, Yongxue Xia, Taotao Du, Wengang Liu, Chenyang Zhang   +5 more
doaj   +2 more sources

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, Baoyan ZHI, Taotao DU, Guangyu YANG, Chuang LU, Yongxue XIA   +5 more
doaj   +1 more source