Results 11 to 20 of about 4,362 (258)

Evolution of broken structure of hard thick roof and analysis of impact hazard area

Meikuang Anquan
Aiming at the influence of hard and thick roof fracture and structural evolution on the impact of working face, taking the hard and thick roof condition of 63 upper 05 working face in Dongtan Coal Mine as the engineering background, the critical ...
Pengfei LYU, Xuekai CUI, Zhuang MIAO, Kangbin LU, Yijian GENG   +4 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   +4 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   +4 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   +3 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   +2 more sources

Investigation on the Movement and Fracture Characteristics of an Extra-Thick Hard Roof during Longwall Panel Extraction in the Yima Mining Area, China

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, Daixin Deng, Ruiming Shi, Guozhen Yang, Shuo Xu, Yaodong Jiang   +5 more
doaj   +2 more sources

Structural quantification of multi-thick hard roof and strong ground pressure control in large mining height stope: a case study

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
The 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, Shaohong Yan, Kunyou Zhou, Chenxi Zhang, Yi Zhou   +4 more
doaj   +2 more sources

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Processes, 2023
Underground mining in coal mines causes strong disturbance to geological structures and releases a large amount of elastic strain energy. When the roof is a hard and thick rock layer, it is easy to cause dynamic disasters such as rock burst. To analyze the impact of a deep thick and hard roof fracture on the safe mining of thick coal seams, this paper ...
Zhigang Zhang, Linchao Dai, Haitao Sun, Yanbao Liu, Huiming Yang, Rifu Li, Yi Zhang   +6 more
openaire   +2 more sources

Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China

Advances in Civil Engineering, 2018
Ultra-thick hard sandstone roofs present high thickness, poor delamination, and wide caving range. The strata pressure of the working face during actual mining increases, having a significant influence on the safe mining of the working face.
Feng Ju, Meng Xiao, Zequan He, Pai Ning, Peng Huang   +4 more
doaj   +2 more sources

Experiment Study on the Mechanical Behavior and Acoustic Emission Response of Thick and Hard Sandstone Roof in Xinjiang Mining Area

Advances in Civil Engineering
One of the primary threats to coal mine safety production is the sudden extensive fracturing and collapse of thick and hard roof strata. A range of uniaxial compression experiments with acoustic emission (AE) monitoring was performed for studying the ...
Dongdong Qin, Zechao Chang, Ze Xia
doaj   +2 more sources