Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation
In order to determine the applicability of liquid CO<sub>2</sub> phase-transition fracturing technology in rock mass excavations, the principles of CO<sub>2</sub> phase-transition fracturing were analyzed, and field tests of liquid CO<sub>2</sub> phase-transition...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/1/68 |
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| author | Haoyue Sui Tianming Su Ruilin Hu Ke Yang Yaxing Cheng |
| author_facet | Haoyue Sui Tianming Su Ruilin Hu Ke Yang Yaxing Cheng |
| author_sort | Haoyue Sui |
| collection | DOAJ |
| description | In order to determine the applicability of liquid CO<sub>2</sub> phase-transition fracturing technology in rock mass excavations, the principles of CO<sub>2</sub> phase-transition fracturing were analyzed, and field tests of liquid CO<sub>2</sub> phase-transition fracturing were performed. An “Unmanned Aerial Vehicle (UAV) camera shooting + Microstructure Image Processing System (MIPS) analyzing” method was used to acquire the rock mass characteristics. Further, the Hilbert–Huang Transform (HHT) energy analysis principle was adopted to analyze the characteristics of fracturing vibration waves. The experimental results showed that during the process of fracturing, there were both dynamic actions of rock breakage due to excitation stress wave impacts, and quasi-static actions of rock breakage caused by gasification expansion wedges. In semi-infinite spaces, rock-breakage zones can mainly be divided into crushing zones, fracture zones, and vibration zones. At the same time, under ideal fracturing effects and large volumes, the fracturing granularity will be in accordance with the fractal laws. For example, the larger the fractal dimensions, the higher the proportion of small fragments, and vice versa. Moreover, the vibration waves of the liquid CO<sub>2</sub> phase-transition fracturing have short durations, fast attenuation, and fewer high-frequency components. The dominant frequency band of energy will range between 0 and 20 Hz. The liquid CO<sub>2</sub> phase-transition fracturing technology has been observed to overcome the shortcomings of traditional explosive blasting methods and can be applied to a variety of rock types. It is a safe and efficient method for rock-breaking excavations; therefore, the above technology effectively provides a new method for the follow-up of similar engineering practices. |
| first_indexed | 2024-03-10T03:51:38Z |
| format | Article |
| id | doaj.art-c8a86fc3372040ecb6a9e64f7998edf3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:51:38Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c8a86fc3372040ecb6a9e64f7998edf32023-11-23T11:07:07ZengMDPI AGApplied Sciences2076-34172021-12-011216810.3390/app12010068Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock ExcavationHaoyue Sui0Tianming Su1Ruilin Hu2Ke Yang3Yaxing Cheng4Key Laboratory of Transport Industry of Road Structure and Material, Research Institute of Highway Ministry of Transport, Beijing 100088, ChinaKey Laboratory of Transport Industry of Road Structure and Material, Research Institute of Highway Ministry of Transport, Beijing 100088, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaLand and Resources Exploration Center, Hebei Bureau of Geology and Mineral Resources Exploration, Shijiazhuang 050081, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaIn order to determine the applicability of liquid CO<sub>2</sub> phase-transition fracturing technology in rock mass excavations, the principles of CO<sub>2</sub> phase-transition fracturing were analyzed, and field tests of liquid CO<sub>2</sub> phase-transition fracturing were performed. An “Unmanned Aerial Vehicle (UAV) camera shooting + Microstructure Image Processing System (MIPS) analyzing” method was used to acquire the rock mass characteristics. Further, the Hilbert–Huang Transform (HHT) energy analysis principle was adopted to analyze the characteristics of fracturing vibration waves. The experimental results showed that during the process of fracturing, there were both dynamic actions of rock breakage due to excitation stress wave impacts, and quasi-static actions of rock breakage caused by gasification expansion wedges. In semi-infinite spaces, rock-breakage zones can mainly be divided into crushing zones, fracture zones, and vibration zones. At the same time, under ideal fracturing effects and large volumes, the fracturing granularity will be in accordance with the fractal laws. For example, the larger the fractal dimensions, the higher the proportion of small fragments, and vice versa. Moreover, the vibration waves of the liquid CO<sub>2</sub> phase-transition fracturing have short durations, fast attenuation, and fewer high-frequency components. The dominant frequency band of energy will range between 0 and 20 Hz. The liquid CO<sub>2</sub> phase-transition fracturing technology has been observed to overcome the shortcomings of traditional explosive blasting methods and can be applied to a variety of rock types. It is a safe and efficient method for rock-breaking excavations; therefore, the above technology effectively provides a new method for the follow-up of similar engineering practices.https://www.mdpi.com/2076-3417/12/1/68liquid carbon dioxidephase-transitionrock mass excavationfragmentation distributionHHT |
| spellingShingle | Haoyue Sui Tianming Su Ruilin Hu Ke Yang Yaxing Cheng Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation Applied Sciences liquid carbon dioxide phase-transition rock mass excavation fragmentation distribution HHT |
| title | Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation |
| title_full | Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation |
| title_fullStr | Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation |
| title_full_unstemmed | Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation |
| title_short | Liquid CO<sub>2</sub> Phase-Transition Rock Fracturing: A Novel Technology for Safe Rock Excavation |
| title_sort | liquid co sub 2 sub phase transition rock fracturing a novel technology for safe rock excavation |
| topic | liquid carbon dioxide phase-transition rock mass excavation fragmentation distribution HHT |
| url | https://www.mdpi.com/2076-3417/12/1/68 |
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