Results 11 to 20 of about 4,107 (241)
Applied SciencesThe safety and efficiency of underground coal mining are threatened by thick hard roofs characterized by large overhang areas, problematic spontaneous caving, and high dynamic load upon their breakage.
Wei Zhang +5 more
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Applied SciencesBecause of its strong bearing capacity and large size, a thick and hard roof is the main source of strong ground pressure in a stope, and its breaking and migration mechanism and effective control are very important for realizing safe and efficient ...
Xingping Lai +4 more
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Research on the Reasonable Width of Coal Pillar Driving along Goaf under Thick Hard Roof
Applied Sciences (Switzerland)There are fewer studies on the width of coal pillar retaining under a thick, hard roof. This paper takes the thick limestone roof in the 10110 working face of Jinniu Coal Mine as the background, taking the reasonable coal pillar width and its stability control technology as research objectives. Taking the theoretical analysis and calculation, numerical
Gu, Wei +3 more
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Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesThe 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 +4 more
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矿业科学学报, 2016 It is difficult to determine the first roof weighting interval of hard roof on fully mechanized caving face.Based on the working face 8301 of Dongzhouyao coal mine, a model of two edges fixed in thick and hard roof was established by using energy method ...
Cheng Zhanbo, Kong Dezhong, Yang Jinghu
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Water (Switzerland)The collapse of thick-hard roofs after coal has been extracted is not a consequential process in all cases. Rather, it happens due to the augmentation of high stress conducted at depth, followed by a wider range of damage as the floor cracks. The extent and spread of the cracks in the floor indicate the intensity of the collapse, and the mine will be ...
Shangxian Yin, Min Cao
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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 +5 more
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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 +5 more
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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 +6 more
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Analysis and Application on Controlling Thick Hard Roof Caving with Deep‐Hole Position Presplitting Blasting [PDF]
Advances in Civil Engineering, 2018 For the thick hard roof (THR) in Datong mining area, mining operations often led to large‐scale hanging‐roof and frequent and strong strata behavior, threatening mining safety seriously. Based on the instability mechanism, the fracture model for THR was established, including rock blocks articulation and combined cantilever beam, and the limit initial ...
Baobao Chen, Changyou Liu
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