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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Feng Gao & Leihu Tang & Keping Zhou & Yanan Zhang & Bo Ke, 2018. "Mechanism Analysis of Liquid Carbon Dioxide Phase Transition for Fracturing Rock Masses," Energies, MDPI, vol. 11(11), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:2909-:d:178313
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    Citations

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    Cited by:

    1. Jieqin Xia & Bin Dou & Hong Tian & Jun Zheng & Guodong Cui & Muhammad Kashif, 2021. "Research on Initiation of Carbon Dioxide Fracturing Pipe Using the Liquid Carbon Dioxide Phase-Transition Blasting Technology," Energies, MDPI, vol. 14(3), pages 1-16, January.
    2. Shengtao Zhou & Nan Jiang & Xu He & Xuedong Luo, 2020. "Rock Breaking and Dynamic Response Characteristics of Carbon Dioxide Phase Transition Fracturing Considering the Gathering Energy Effect," Energies, MDPI, vol. 13(6), pages 1-16, March.
    3. Feng Gao & Yan Shao & Keping Zhou, 2020. "Analysis of Microwave Thermal Stress Fracture Characteristics and Size Effect of Sandstone under Microwave Heating," Energies, MDPI, vol. 13(14), pages 1-16, July.
    4. Bo Ke & Keping Zhou & Gaofeng Ren & Ji Shi & Yanan Zhang, 2019. "Positive Phase Pressure Function and Pressure Attenuation Characteristic of a Liquid Carbon Dioxide Blasting System," Energies, MDPI, vol. 12(21), pages 1-16, October.

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