Results 271 to 280 of about 159,695 (300)
Some of the next articles are maybe not open access.
Environmental Earth Sciences, 2021
The Taiyuan group is one of the coal-bearing formations in Shanxi Province, in which coal resource is extremely abundant. No.15 coal seam is the main minable coal seam in Taiyuan group, and it develops with thick-hard limestone roof which is a threat to safe and efficient mining because of the roof failure.
KaigeZheng +4 more
semanticscholar +2 more sources
The Taiyuan group is one of the coal-bearing formations in Shanxi Province, in which coal resource is extremely abundant. No.15 coal seam is the main minable coal seam in Taiyuan group, and it develops with thick-hard limestone roof which is a threat to safe and efficient mining because of the roof failure.
KaigeZheng +4 more
semanticscholar +2 more sources
Results in EngineeringArabian Journal of Geosciences, 2021
Roof management in coal mines is a critical technology challenge to realize safe production. Dynamic disasters can be induced by a sudden collapse of the roof when encountering a thick hard roof above a coal seam. To solve this problem, directional hydraulic fracturing technology was utilized in the coal mine WP with a thick hard limestone roof.
Yongxin Sun, Y. Fu, Tao Wang
semanticscholar +2 more sources
Roof management in coal mines is a critical technology challenge to realize safe production. Dynamic disasters can be induced by a sudden collapse of the roof when encountering a thick hard roof above a coal seam. To solve this problem, directional hydraulic fracturing technology was utilized in the coal mine WP with a thick hard limestone roof.
Yongxin Sun, Y. Fu, Tao Wang
semanticscholar +2 more sources
Geotechnical and Geological Engineering, 2021
In order to determine the reasonable empty roof distance during roadway excavation, a mechanical model of the direct roof rock beam was established, and the relationship between the direct roof tensile stress and the empty roof distance was obtained. According to the criterion of roof stability, that is, the tensile stress of the roof does not exceed ...
Sen Yang +3 more
openaire +1 more source
In order to determine the reasonable empty roof distance during roadway excavation, a mechanical model of the direct roof rock beam was established, and the relationship between the direct roof tensile stress and the empty roof distance was obtained. According to the criterion of roof stability, that is, the tensile stress of the roof does not exceed ...
Sen Yang +3 more
openaire +1 more source
Fractural structure of thick hard roof stratum using long beam theory and numerical modeling
Environmental Earth Sciences, 2017The thick hard rock (THR) roof of the long-wall mining face is prone to the large-sized cantilever roof, and its sudden fracture will cause serious rock dynamic disasters, such as coal and gas outburst and rockburst. In this study, based on the long beam theory, the initial fracture mechanical model for THR was established, and the first weighting ...
Tong Zhao +4 more
semanticscholar +3 more sources
Experimental study on the bump-inducing mechanism of slicing in thick coal seams with hard roofs
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021The bump-inducing mechanism of slicing in thick coal seams with hard roofs is still not completely understood.
Chuan Chen +5 more
openaire +1 more source
Applied Sciences
In this study, the thick, hard roof group of the 20103 working face in the Dahaize Coal Mine is used as the research object. UDEC discrete element simulations were conducted to examine fracture-induced energy release characteristics under unweakened ...
Xiaolong Shi +5 more
semanticscholar +1 more source
In this study, the thick, hard roof group of the 20103 working face in the Dahaize Coal Mine is used as the research object. UDEC discrete element simulations were conducted to examine fracture-induced energy release characteristics under unweakened ...
Xiaolong Shi +5 more
semanticscholar +1 more source
Moment Tensor and Stress Field Inversions of Mining-Induced Seismicity in A Thick-Hard Roof Zone
Rock Mechanics and Rock Engineering, 2023Chunting Song +6 more
semanticscholar +1 more source