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

Jilin Wang, Ming Li, Shaochun Xu, Zhenghui Qu and Bo Jiang
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Jilin Wang: Key Laboratory of CBM Resources and Reservoir Formation Process, Ministry of Education (China University of Mining &Technology), Xuzhou 221116, China
Ming Li: Key Laboratory of CBM Resources and Reservoir Formation Process, Ministry of Education (China University of Mining &Technology), Xuzhou 221116, China
Shaochun Xu: Department of Computer Science, Algoma University, Sault Ste Marie, ON P6A2G4, Canada
Zhenghui Qu: Key Laboratory of CBM Resources and Reservoir Formation Process, Ministry of Education (China University of Mining &Technology), Xuzhou 221116, China
Bo Jiang: Key Laboratory of CBM Resources and Reservoir Formation Process, Ministry of Education (China University of Mining &Technology), Xuzhou 221116, China

Energies, 2018, vol. 11, issue 5, 1-16

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.

Keywords: ground stress; simulation; gas; gas outburst risks; advanced prediction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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