Collaborative gas drainage technology of high and low level roadways in highly-gassy coal seam mining

Xu, Chao; Wang, Kai; Li, Xiaomin; Yuan, Liang; Zhao, Chunyu; Guo, Haijun

doi:10.1016/j.fuel.2022.124325

Cited by 39 publications

(16 citation statements)

References 30 publications

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“…Mining of the protective layer was concurrent with the extraction of gas from the protected layer through pressure relief, and thus, this minimized the risk of a gas outburst. In the mining of the highly-gassy coal seams, strengthening gas drainage in the goaf and fissure zone can improve the efficiency of coal seams and reduce carbon emissions 40 . According to the actual situation in the mine, pressure relief holes have been drilled vertically from the bottom pumping roadway to extract gas from the M18 coal seam, and the layout of these holes are depicted in Fig.…”

Section: Analysis Of Fissure Evolution and Pressure Relief Gas Extrac...mentioning

confidence: 99%

Evolution of fissures and pressure discharge of gas caused by mining of the upper protective layer of a coal seam

Xie

Cai

et al. 2023

Sci Rep

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The evolution of fissures and permeability associated with mining of the upper protective layer of the coal seam is crucial for pressure relief gas drainage of the underlying seam. To understand the influence of mining the upper protective layer on gas drainage within the underlying coal seam, this study utilized the M16 and M18 seams in the Qinglong Coal Mine in Guizhou. Theoretical analysis, discrete element numerical simulation, and field tests were used to characterize the evolution of fractures associated with mining of the upper protective layer and the effects of pressure relief gas drainage within the protected coal seam. The results show that mining-related stress changes controlled the development of fractures, altering the permeability values of coals. An analysis of the crack development in the coal mass caused by mining of the upper protective layer shows that during the initial stage of mining, the produced cracks exhibited a butterfly shape network. Yet, with further development of the mining, these cracks and the stress changes gradually produced an inverted butterfly shape network. According to simulations, the areas of maximum deformation via expansion in the protected coal seam were located near the open cut and the mining end line of the working face. The maximum deformation values were 29.06 and 26.68 mm, respectively, and the corresponding deformation rates were 9.37‰ and 8.61‰, which are greater than the required 3‰. The findings of this study provide a new reference for gas control in pressure relief coal seams under similar working conditions.

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Section: Analysis Of Fissure Evolution and Pressure Relief Gas Extrac...mentioning

confidence: 99%

Evolution of fissures and pressure discharge of gas caused by mining of the upper protective layer of a coal seam

Xie

Cai

et al. 2023

Sci Rep

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“…Palchik, 2020;Qin et al 2019). In addition to one or several coal seams, coalbearing strata also contain multiple layers of strata with different thickness and hardness (Liu et al 2019. Xu et al 2022) Practice shows that there are often one or more layers of THRS with good integrity above the mining coal seams.…”

Section: Instructionmentioning

confidence: 99%

Numerical simulation of progressive failure law of thick-hard rock strata in the upper coal seam

Zhao

Wang

et al. 2023

Preprint

Self Cite

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The thick-hard rock strata (THRS) are widely distributed among coal-bearing strata. In the process of coal mining, the strong dynamic load will be produced after the THRS are broken, which will lead to dynamic disasters such as mine earthquake, rock burst and so on. Therefore, revealing the breaking law of THRS is helpful to prevent and control the dynamic disasters. This paper constructed the mechanical model of THRS based on thick plate theory and obtained the breaking distance of THRS, which is applied to Yangliu Coal Mine. And we constructed the numerical stratigraphic model and analyzed the caving characteristics, the changing rules of displacement and stress of THRS under different advancing distances. Then the above results are verified by the change of hydraulic support resistance. The research shows that the critical instability distance of THRS overlying the coal seam #10 in Yangliu Coal Mine was 296.4 m. Based on the numerical simulation, the displacement and stress of the main THRS increased greatly at the position of 250-300 m, and occurred a large-scale collapse. The hydraulic support resistance of the working face increased sharply and microseismic energy is released rapidly when the mining reached about 330 m, the reliability of the theoretical analysis and numerical simulation were verified by the engineering tests.

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“…Karacan et al 13 established an evaluation system for the pumping effect of boreholes1. Xu et al 14 proposed a new technology for collaborative drainage of gas from gob in high and low levels roadways, providing a new way for gas utilization in high gas mines. The key research objective of the gob flow field is to build a model of void fraction and permeability in the gob.…”

Section: Introductionmentioning

confidence: 99%

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Min,

Liu,

Chen

et al. 2023

Energy Science & Engineering

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The number of mines using roof cutting and pressure relief technology to extract mine deep coal resources is increasing daily. Most of these mines are facing the risk of high gas emission and residual coal spontaneous combustion disasters, and the composite disasters caused by these two risks also threaten the safety of mine production. On the basis of constructing a model for the evolution of porosity and permeability in a single side roof cutting along the gob, this study studied the occurrence locations of gas explosion risk areas, oxidation and heating risk areas, and composite disaster areas under different air supply and gas emission conditions, and summarized the evolution laws of composite disaster risk areas. The research results show that the roof rock collapse caused by roof cutting and pressure relief technology reduces the permeability of porous medium, which significantly reduces the sensitivity of the width of the oxidation temperature rise zone and the composite disaster area to the air supply. The increase in air supply causes the position of the composite disaster risk zone inside the goaf to shift toward the deep part of the goaf, while the width remains basically unchanged. The increase in gas emissions has suppressed the occurrence of coal spontaneous combustion in the goaf, while also keeping the gas concentration in a large area outside the upper limit of gas explosion. The research content enriches the research system of gas and oxygen flow fields in the goaf cutting face, and has positive significance for the promotion and application of goaf cutting technology and the understanding of secondary disasters caused by it.

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Collaborative gas drainage technology of high and low level roadways in highly-gassy coal seam mining

Cited by 39 publications

References 30 publications

Evolution of fissures and pressure discharge of gas caused by mining of the upper protective layer of a coal seam

Evolution of fissures and pressure discharge of gas caused by mining of the upper protective layer of a coal seam

Numerical simulation of progressive failure law of thick-hard rock strata in the upper coal seam

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

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