Rock Breaking and Dynamic Response Characteristics of Carbon Dioxide Phase Transition Fracturing Considering the Gathering Energy Effect

Shengtao Zhou, Nan Jiang, Xu He and Xuedong Luo
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Shengtao Zhou: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Nan Jiang: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Xu He: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Xuedong Luo: Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Energies, 2020, vol. 13, issue 6, 1-16

Abstract: Carbon dioxide phase transition fracturing has been widely used in rock mass excavation under complex environments, and its special rock breaking process shows obvious gathering energy effect. In this paper, the gathering energy effect of this technology is considered and then the impact reduction coefficient is defined and determined. Eventually, a combined method of field tests and numerical simulations is used to study the crack propagation characteristics and spatiotemporal changes of dynamic response. The results show that the cracks grow more and more slowly as time goes by; the peak displacement and peak point velocity in the primary impact direction are both greater than those in the secondary impact direction. The peak point velocity in different directions decreases as the distance from borehole increases and it decays more and more slowly. With the increase of distance from the borehole, the peak effective stress in the primary impact direction constantly decreases. However, it increases first and then decreases in the secondary impact direction. The results mentioned above can provide effective guidance for later experimental research and engineering.

Keywords: carbon dioxide phase transition; rock mass excavation; gathering energy effect; crack propagation; dynamic response (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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