The characteristics of abnormal gas emission in tunneling through the small fault groups of Yizhong coal mine

Shu, Ma; Li, Qingsong; Han, Zuozhen; Zhang, Pengxiang; Kang, Furu

doi:10.1080/12269328.2016.1178181

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…The greater the burial depth of the coal seam, the larger the in-situ stress and the greater the distance of gas escape, which is also conducive to gas sealing. The greater the thickness of the coal seam, the more conducive it is to gas preservation (Qin et al 2009;Wang and Ren, 2010;Shu et al 2011;Zhang and Long, 2013;Ma et al 2016;Li et al 2018). However, some studies have shown that the depth effect is no longer obvious when the depth of coal seam exceeds the critical point of 800-900 m (Wang, 2015;Zhang, 2018).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Gas Pressure in Thin Coal Seams in the Qinglong Coal Mine in Guizhou Province, China

Zhang

Wang

et al. 2021

Preprint

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Thin coal seams in mines lack gas data; thus, gas outbursts of thin coal seams are difficult to prevent and control. In this study, a coal structure index, which is used to express the damage degree of coal, was estimated by logging curve. In accordance with the contour line of the floor of the coal seam, structural curvature was calculated to quantitatively express the complexity of the coal seam structure. Then, the relationships among the burial depth, thickness, coal structure index, structural curvature, with gas pressure of coal seam were analyzed. The gas pressure of coal seam of Nos. 22, 24, and 27 in the study area was predicted by multiple linear regression (MLR) and then was verified and analyzed. The deviation rate of the MLR method was 6.5%–19.7%, with an average of 13.0%. The average deviation rate between the predicted value and the measured value was 11.6%, except for measuring point of No. 2, which had a large deviation. Results show that the prediction accuracy of the above method is acceptable, and it has practical value in the prediction of gas pressure in thin coal seams without measured data. Results of the gas pressure prediction provide a basis for evaluating the risk of gas outbursts in thin coal seams.

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Section: Introductionmentioning

confidence: 99%

Prediction of Gas Pressure in Thin Coal Seams in the Qinglong Coal Mine in Guizhou Province, China

Zhang

Wang

et al. 2021

Preprint

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OpenFOAM solver of the methane behaviour near the coal mine tunnelling face and its application

Zhao

2021

Journal of Geophysics and Engineering

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The methane near a tunnelling face seriously affects production safety in coal mines. A model considering methane seepage, adsorption, desorption and coal damage processes was established in this research. The open field operation and manipulation (OpenFOAM) solver was compiled to numerically solve the established model. The model is validated against data published in a previous theoretical study. The solver was used to investigate the effect of different parameters on methane emission regularity. This solver demonstrates that the effects of the original stress, coal cohesion and coal internal friction angle on the methane emission rate are limited, but their effects on the width of the fractured zone and effective stress are great. The effects of the initial methane pressure and coal adsorption parameters on the methane emission rate are also notable, but their effects on the width of the fractured zone and effective stress are limited.

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Simulation of Ground Stress Field and Advanced Prediction of Gas Outburst Risks in the Non-Mining Area of Xinjing Mine, China

Wang

et al. 2018

Energies

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Abstract:In order to predict in advance the coal and gas outburst risks in the No. 3 coal seam in the non-mining area of the Xinjing mine, the strata were divided into seven rock assemblage types based on the lithologic characteristics of strata in the research area, and eight geological profile models were constructed. The finite element methods were used to simulate the ground stress field of the No. 3 seam floor. Based on the log curve, the coal structural type of the No. 3 coal seam was identified, with the thicknesses of the coal body under different types of damage being marked off in each borehole. A damage index of the coal structure (DV) was also proposed, and the DV indexes for all boreholes were calculated. The coal and gas outburst risks in the research area were comprehensively evaluated and predicted through a superposition analysis of the spatial distribution states of three indexes, namely: ground stress, coal structure damage degree, and coal seam gas content. The results show that the equivalent stress of the No. 3 coal seam floor is usually within the range of 9-26 MPa. The high-stress zone presents a strip distribution along the northeast-southwest (NE-SW) direction. The distribution of ground stress is mainly subject to the folds and buried depth of the coal seam. The distribution range where the damage degree of the coal structure falls under Types II and III is DV ≥ 22. The gas outburst risk in the mid-southern and northeastern parts of the research area is high, whereas that in the mid-western part is low. The zones with a high and low degrees of gas outburst risks are all mainly present as strips in the NE-SW direction. The gas outburst risk in the northwest and southeast is moderate. The research results can provide guidance for gas control in non-mining areas.

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The characteristics of abnormal gas emission in tunneling through the small fault groups of Yizhong coal mine

Cited by 3 publications

References 3 publications

Prediction of Gas Pressure in Thin Coal Seams in the Qinglong Coal Mine in Guizhou Province, China

Prediction of Gas Pressure in Thin Coal Seams in the Qinglong Coal Mine in Guizhou Province, China

OpenFOAM solver of the methane behaviour near the coal mine tunnelling face and its application

Simulation of Ground Stress Field and Advanced Prediction of Gas Outburst Risks in the Non-Mining Area of Xinjing Mine, China

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