Experimental study on the influence of coal oxidation on coal and gas outburst during invasion of magmatic rocks into coal seams

2019 ◽  
Vol 124 ◽  
pp. 213-222 ◽  
Author(s):  
Buzhuang Zhou ◽  
Shengqiang Yang ◽  
Chaojie Wang ◽  
Jiawen Cai ◽  
Qin Xu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coal And Gas Outburst ◽  
Coal Oxidation ◽  
Coal Seams ◽  
Gas Outburst ◽  
Magmatic Rocks

Safe strategy for coal and gas outburst prevention in deep-and-thick coal seams using a soft rock protective layer mining

2020 ◽  
Vol 129 ◽  
pp. 104800 ◽  
Author(s):  
Liang Wang ◽  
Zhuang Lu ◽  
Da-peng Chen ◽  
Qing-quan Liu ◽  
Peng Chu ◽  
...  
Keyword(s):  
Soft Rock ◽  
Protective Layer ◽  
Coal And Gas Outburst ◽  
Coal Seams ◽  
Gas Outburst ◽  
Safe Strategy

scholarly journals Risk assessment method of coal and gas outburst based on improved comprehensive weighting and cloud theory

2021 ◽  
pp. 014459872110558
Author(s):  
Chunhua Zhang ◽  
Dengming Jiao ◽  
Ziwen Dong ◽  
Hongyu Zhang
Keyword(s):  
Risk Assessment ◽  
Coal Seam ◽  
Ideal Point ◽  
Assessment Method ◽  
Coal And Gas Outburst ◽  
Coal Seams ◽  
Gas Outburst ◽  
Risk Assessment Method ◽  
Cloud Theory ◽  
Assessment Results

Risk assessment is an effective method of accident prevention and is vital to actual production. To reduce the risk of mining accidents and realize green and sustainable coal mining, a coal and gas outburst risk assessment method based on the improved comprehensive weight and cloud theory is proposed. The proposed method can effectively solve problems of fuzziness and randomness, index weight deviation, and correlation between indexes in risk assessment, as well as improve the accuracy and rationality of assessment. Nine influencing factors that correspond to coal seam occurrence and geological characteristics, coal seam physical characteristics, and gas occurrence characteristics are selected to establish the risk assessment index system of coal and gas outburst. Using the improved group G1 method and improved CRITIC method to obtain the subjective and objective weights, the ideal point method is used to obtain the comprehensive weight. Using the normal cloud model of cloud theory and the comprehensive weight to assess engineering examples 1–2, the No. 3 coal seam of a mine in Shanxi, and the 21 coal seam of a mine in Henan, the risk grade of coal and gas outburst is determined and then compared with the assessment results obtained from the engineering examples and the actual situations of the above mentioned coal seams. The results show that the coal and gas outburst risks of engineering examples 1–2, No. 3 coal seam, and 21 coal seam are of grades IV, IV, II, and IV, respectively. The No. 3 coal seam and 21 coal seam belong to lower and higher risk categories, respectively. The assessment results are consistent with the actual situation of the coal seams, thereby confirming the rationality and accuracy of the proposed method. This study expands the methods of coal and gas outburst risk assessment and facilitates the formulation of effective preventive measures.

Experimental study of the impact of gas adsorption on coal and gas outburst dynamic effects

2019 ◽  
Vol 128 ◽  
pp. 158-166 ◽  
Author(s):  
Jie Cao ◽  
Linchao Dai ◽  
Haitao Sun ◽  
Bo Wang ◽  
Bo Zhao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Adsorption ◽  
Coal And Gas Outburst ◽  
Dynamic Effects ◽  
Gas Outburst ◽  
The Impact

Features of Jianshanchong Klippe and its Control to Gas Geology at Qingshan Coal Mine, Jiangxi Province

2012 ◽  
Vol 164 ◽  
pp. 501-505
Author(s):  
Zhi Gen Zhao ◽  
Jia Chen ◽  
Jia Ping Yan
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Emission Rate ◽  
Coal And Gas Outburst ◽  
Jiangxi Province ◽  
Coal Seams ◽  
Gas Emission ◽  
Gas Outburst ◽  
Transverse Profile ◽  
Tectonic Coal

The coal and gas outburst is serious at Qingshan Coal Mine of Jiangxi Province, so it is of significance to research the features of Jianshanchong klippe and its control to gas geology. The research reveals that: Jianshanchong klippe is distributed from the east boundary of Qingshan Coal Mine to No. 45 Exploration Line, its transverse profile is like a funnel while its longitudinal profile is like a wedge, northwest side of the klippe is thicker and deeper while southeast side is thinner and more shallow. Because of the cover and insert of Jianshanchong klippe, the structure of coal-bearing strata is more complex, some secondary folds are formed, and also, the coal seam is changed greatly, the tectonic coal is well developed and the coal seam is suddenly thickening or thinning. Due to the effect of Jianshanchong klippe, the coal and gas outbursts occur in the area of secondary folds, thicker coal seams or tectonic coals. Concerning the prediction of gas geology in deep area, in view of the facts including simpler structure, stable coal seam and decreased thickness, the gas emission rate and the coal and gas outburst will decrease in Fifth and Sixth Mining Level than that in Second and Third Mining Level

The Preventing Coal and Gas Outburst Technology of Middle Distance and Low Permeability and Upper Protective Layer

2013 ◽  
Vol 690-693 ◽  
pp. 3059-3067 ◽  
Author(s):  
Guo Wei Dong
Keyword(s):  
Protective Layer ◽  
Mining Area ◽  
Coal And Gas Outburst ◽  
Low Permeability ◽  
Control Effect ◽  
Coal Seams ◽  
Gas Outburst ◽  
Protection Layer ◽  
And Control ◽  
Layer Control

Protective layer mining is the main regional measures for control coal and gas outburst . According to the defects of the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer in western Shuicheng mining area, the coal seams coal and gas outburst original danger are analyzed and protective layer is choosed initially using gas geological theory,the choice upper protective layer feasibility is analyzed using protection layer theory. the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer control effect is studied by numerical simulation and spot investigation. The conclusions from this research：the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer can decrease coal and gas outburst prediction index and control coal and gas outburst; the coal seams coal and gas outburst original danger can be preliminarily evaluated and the evaluation result can provide the basis for protective layer choice; the preventing coal and gas outburst technology of middle distance and low permeability and upper protective layer can be applied in western marine-continental transitional facies coal measure strata.

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