Numerical Simulation of Gas Extraction in Coal Seam Strengthened by Static Blasting

Xiaoqiang Zhang (), Fengyuan Zhou and Jiaxing Zou
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Xiaoqiang Zhang: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Fengyuan Zhou: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Jiaxing Zou: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China

Sustainability, 2022, vol. 14, issue 19, 1-17

Abstract: For mines with low permeability and high gas emissions, static blasting technology is used to pre-split the coal seam to increase the permeability and strengthen the gas extraction, which will significantly reduce the occurrence of gas accidents in mines. Taking Wangjialing Coal Mine as the research object, the mathematical model of fluid-solid is established. The numerical simulation software COMSOL is used to simulate the established mathematical model. Simultaneously, the factors affecting the efficiency of static blasting gas extraction are analyzed by adjusting the parameters. The results reveal a more significant drop in gas pressure with increasing time. At 10 d, 30 d, 90 d and 180 d, the extraction efficiency increases by 11.80%, 18.67%, 22.22% and 24.13% in comparison to conventional extraction. In studying the influence of expansion pressure and other factors on gas extraction during static blasting, it is found that the change of negative pressure has little effect on gas extraction. Static blasting can significantly reduce gas pressure and achieve safe coal mining, providing a basis of field application of efficient gas extraction in low gas mines.

Keywords: static blasting; conventional extraction; numerical simulation; permeability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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