Affiliation:
1. School of Mines Key Laboratory of Deep Coal Resource Ministry of Education of China China University of Mining & Technology Xuzhou Jiangsu 221116 China moe.edu.cn
2. State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology Xuzhou Jiangsu 221116 China cumt.edu.cn
3. Institute of Geotechnical and Underground Engineering Guangzhou Design Institute Guangzhou Guangdong 510620 China
Abstract
Abstract
Coal seams are generally characterized by high pressure, low permeability, and strong adsorption in China. Moreover, carbon dioxide phase transition blasting (CDPTB) is an effective way to achieve pressure relief and permeability enhancement in high-gas pressure coal seams. Multiple fractures can be created in the coal body by CDPTB due to its characteristics of having a great impact stress and high energy efficiency. To determine the dual characteristics of coal fracturing and seepage after CDPTB, this paper developed a fluid solid coupling programme based on CDPTB cracking and permeability enhancement, which unifies the fracture and seepage of CDPTB. FLAC was used to determine the distribution characteristics of the stresses and fractures caused by CDPTB. The results showed fracture propagation from the initial fracture to multiple additional fractures or the main fractures over time. Then, the fractures were introduced into COMSOL software to simulate the characteristics of the gas flow field. The main fracture forms an effective channel for gas flow, which greatly reduces the gas pressure in coal. The successful application of CDPTB in the field induced the increase in the gas drainage effect by 10-20 times.
Funder
Fundamental Research Funds for the Central Universities
Natural Science Foundation of Jiangsu Province
National Natural Science Foundation of China
Cited by
5 articles.
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