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A new dynamic fracturing method: deflagration fracturing technology with carbon dioxide

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Abstract

Control of damaged zone caused by impact load is the challenging issue in blasting engineering. In this paper, a new rock breaking method using carbon dioxide ice powder is developed, which is characterized by weak disturbance. Then experiments on the \(\text {CO}_{2}\) pneumatic fracturing of concrete specimens were conducted. Generally, the \(\text {CO}_{2}\)-driven fracturing process generates medium strain rate (\(\varepsilon ^\cdot = 10^{0}\) to \(10^{1}\) 1/s), the large concrete specimen was fractured into 3–5 blocks, and no crushing damage occurred. The transient failure modes in the shock wave event were discussed, and the fragment size-strain rate relationship was established based on the cusp mutation theory. The theoretical calculation results are consistent with the experimental results. The research achievement may provide a new and safe rock-fracturing method for geological engineering.

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Acknowledgements

This work is supported by the General Program from the National Natural Science Foundation of China (No. 41702289), and the Fundamental Research Funds for the Central Universities (No. 2018B00614). In addition, special thanks to Jiangsu Supcon Energy Science and Technology Ltd. for its support and assistance in raw materials, test sites and processes.

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, HoHai University, Nanjing, 210098, China

    ShaoBin Hu

  2. Tunnel and Underground Engineering Institute, College of Civil and Transportation Engineering, HoHai University, Nanjing, 210098, Jiangsu, China

    ShaoBin Hu, ShuoGang Pang & ZhengYong Yan

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  1. ShaoBin Hu
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  2. ShuoGang Pang
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  3. ZhengYong Yan
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Correspondence to ShaoBin Hu.

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Hu, S., Pang, S. & Yan, Z. A new dynamic fracturing method: deflagration fracturing technology with carbon dioxide. Int J Fract 220, 99–111 (2019). https://doi.org/10.1007/s10704-019-00403-8

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  • DOI: https://doi.org/10.1007/s10704-019-00403-8

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