Mechanism Analysis of Liquid Carbon Dioxide Phase Transition for Fracturing Rock Masses

Feng Gao, Leihu Tang, Keping Zhou, Yanan Zhang and Bo Ke
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Feng Gao: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Leihu Tang: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Keping Zhou: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Yanan Zhang: School of Resources and Safety Engineering, Central South University, Changsha 410083, China
Bo Ke: School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Energies, 2018, vol. 11, issue 11, 1-12

Abstract: The technique of breaking rocks using carbon dioxide phase transition technology is being widely applied in current research. This article combines theoretical and practical methods to analyze the mechanism by which high-pressure gas breaks rock at different stages. Using the observation that liquid carbon dioxide forms a high-pressure jet from release holes at the moment of release, a formula for calculating the initial pressure on the wall in the direction of release was obtained, and the pattern of initial crack formation on the borehole wall under different initial stress conditions was examined. An experiment using carbon dioxide phase transition technology to fracture rock without an initial stress field was conducted. The mechanism of generation and expansion of subsequent cracks under stress waves and high-pressure gas was analyzed, and the formula for calculating crack propagation radius under stress waves was obtained. The results suggested that under the quasi-static action of high-pressure gas, cracks begin to develop when the stress intensity factor K I at the crack tip is equal to or greater than the fracture toughness K IC of the rock.

Keywords: liquid carbon dioxide; initial pressure; high-pressure gas; crack growth (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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