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

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 c...

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Bibliographic Details
Published in:Energies (Basel) 2020-03, Vol.13 (6), p.1336
Main Authors: Zhou, Shengtao, Jiang, Nan, He, Xu, Luo, Xuedong
Format: Article
Language:English
Subjects:
Boreholes
Carbon dioxide
carbon dioxide phase transition
Computer simulation
Construction accidents & safety
Crack propagation
Dynamic response
Energy
Excavation
Experimental research
Field tests
Fracturing
gathering energy effect
Heat
Load
Phase transitions
Propagation
rock mass excavation
Rock masses
Rocks
Tensile strength
Velocity
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13061336