Influence of Joint Characteristics on Crack Propagation during the Double-Hole High-Energy Gas Impact Permeability Enhancement Process

Dong Duan (), Xi Chen, Xiaojing Feng, Wenbo Liu, Hongzhi Zhang, Xiaoyu Chen, Shilei Gao, Xin Wang and Ao Wang
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Dong Duan: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xi Chen: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaojing Feng: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wenbo Liu: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Hongzhi Zhang: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaoyu Chen: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shilei Gao: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xin Wang: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Ao Wang: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2022, vol. 14, issue 24, 1-14

Abstract: In view of current research on the cracking mechanism of high-energy gas on coal, little attention has been paid to imitating the law of explosive blasting and cracks propagation, and the influence of joint on cracks propagation in the process of high-energy gas impact permeability enhancement has not been taken into account. In this paper, the effects of joint dip angles and joint lengths on cracks size propagation are studied by using a similar simulation test and RFPA2D-dynamic numerical simulation software. In the process of impact permeability enhancement of high-energy gas, the extension direction of the cracks is approximately parallel to the joint, and with the increase in the dip angle and length, the higher the number of cracks, the larger the extension range, and the closer it is to the permeability enhancement holes, the fracture network is formed. When the dip angle of the joint is 30°, the impact permeability enhancement effect results in an obvious zoning phenomenon. When the joint dip angle is 60° and 90°, there is a higher number of cracks and the cracks network is formed, and with the increase in the dip angle, the more the cracks develop and the better the impact permeability enhancement effect.

Keywords: double-hole permeability enhancement; high-energy gas impact permeability enhancement; joint characteristics; quantitative characterization; cracks propagation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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