Results 11 to 20 of about 139,565 (215)

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

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

Study on disaster mechanism of thick and hard overhanging roof and top cutting control technology

Gong-kuang zidonghua
To address the challenges of significant deformation and high instability risks in the surrounding rock of unsupported roadways beneath a laterally thick and hard overhanging roof, this study focused on the 3810 working face transport roadway in ...
GENG Ming, SUN Jing
doaj   +2 more sources

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

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   +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

Determination and Application of the Unsupported Roof Distance in Coal Roadway Driving With the Thick and Hard Main Roof [PDF]

, 2020
Abstract The authors have requested that this preprint be removed from Research Square.
Yang Sen, Hua Xin Zhu, Yang Peng, Liu Xiao, Li Chen, Wang En Qian   +5 more
openaire   +3 more sources

Experimental Study on Presplitting Blasting of Roof Cutting Along Goaf with Thick and Hard Roof Plate

IOP Conference Series: Earth and Environmental Science, 2021
Abstract In order to explore the reasonable blasting parameters of the gob-side entry retaining technology under the specific conditions of thick and hard roof, and realize successful roof cutting and safe roadway retaining, the thick and hard roof of the XV1306 working face in the first panel of Yixin Coal Mine is used as the research ...
Jianquan Tang, Hongliang Liu, Anfa Chen
openaire   +1 more source

Generalization of trends in the influence of geomechanics factors on the choice of operation modes for the fastening system in the preparatory mine workings [PDF]

, 2000
Purpose. Substantiation of the mechanism of loading the preparatory mine working support to optimize its deformation-strength characteristics based on the calculation of the stress-strain state of the “massif – support” system.
Chervatiuk, V, Husiev, O, Kovalevska, I, Snihur, V, Zhuravkov, M   +4 more
core   +2 more sources

Research on the Key Technology of Gob-Side Entry Retaining by Roof Cutting for Thick and Hard Sandstone Roofs

Sustainability, 2022
In order to ensure the application of gob-side entry retaining by roof cutting for thick and hard sandstone roofs, the key technology of pre-split blasting was studied. The LS-DYNA was used to analyze the blasting effect of the energy-gathering pipe. Using the methods of theoretical analysis and numerical simulation, it was determined that the optimal ...
Chaowen Hu, Eryu Wang, Qian Li, Yilong Wang, Yongyuan Li, Xingfeng Sha   +5 more
openaire   +1 more source