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Study on disaster mechanism of thick and hard overhanging roof and top cutting control technology
Gong-kuang zidonghuaTo 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
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Meitan kexue jishu, 2023 The mining of extremely thick coal seam form a large space stope, the fracture disturbance of hard roof spreads to a wide range, the working face weighting has the characteristic of “strong mine pressure”, it is obviously different from rock burst ...
YU Bin +3 more
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Study on the Law of Surface Subsidence in Layered Mining of Thick Coal Seam with Medium Hard Roof
Scientific Reports, 2023 AbstractThe thick coal seam carried out by layered mining, the influence range of the overlying rock layer is relatively larger than that of the single-layer mining, and the surface deformation is more intense. At present, the research of thick coal seam mining is mainly concentrated within 15m, and there are relatively few studies on coal seams with a
Xiugang Liu +5 more
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Development status and Prospect of directional hydraulic fracturing technology for coal mine roof [PDF]
E3S Web of Conferences, 2020 Aiming at the harm and control methods of thick and hard roof in coal mine, the paper firstly analyzes the advanced control methods of thick and hard roof, such as directional shaped charge blasting roof control technology, hydraulic fracturing roof ...
Liangwei LI
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Mechanism and control of deformation in gob-side entry with thick and hard roof strata
Journal of the Southern African Institute of Mining and Metallurgy, 2023 Deformation of gob-side entries has always been a critical concern for ensuring stability in longwall coal mines. This paper addresses the significant deformation and support challenges that arise in thick and hard roof longwall faces (THRLF) due to dynamic pressure.
Guo, J.S., Ma, L.Q., Ngo, I.
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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 +5 more
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Geofluids, 2022 To solve the problem of instability and failure of a roadway in the Dianping coal mine working face under the condition of traditional gob-side entry retaining, a mechanical model was established for analysis. The reasons for the damage are as follows: (1) the mining height is high, and the hard thick old roof exhibits large space for rotation and ...
Daoyong Zhu, Huyue Zhang, Yi Su
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Meitan xuebao, 2023 In the engineering practice of gob side entry retaining by roof cutting, the height and angle of roof cutting are the direct influencing factors, and the reasonable roof cutting parameters allowed by the hard roof with a wide range of roof thickness change have their particularity.
Xuhui XU +5 more
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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 +4 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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