Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment
In order to promote sustainable energy development and reduce the impact of fossil fuels on the environment, it is crucial to strengthen the development and utilization of clean and renewable geothermal energy. Liquid nitrogen fracturing, as an emerging waterless fracturing technology, has outstandi...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2023/4761786 |
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| _version_ | 1850216416001654784 |
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| author | Linchao Wang Xin Liang Xuyang Shi Jianyong Han Yang Chen Wan Zhang |
| author_facet | Linchao Wang Xin Liang Xuyang Shi Jianyong Han Yang Chen Wan Zhang |
| author_sort | Linchao Wang |
| collection | DOAJ |
| description | In order to promote sustainable energy development and reduce the impact of fossil fuels on the environment, it is crucial to strengthen the development and utilization of clean and renewable geothermal energy. Liquid nitrogen fracturing, as an emerging waterless fracturing technology, has outstanding advantages in rock fracturing effect and thermal exchange ability with hot dry rock and is more environmentally friendly. In order to evaluate the influence of liquid nitrogen on the mechanical properties, acoustic emission characteristics, and cross-sectional crack propagation characteristics of granite at different initial temperatures, this paper carried out three-point bending tests and acoustic emission detection on granite treated by high-temperature heating and liquid nitrogen cooling. Finally, based on the cross-sectional scanning test, the expansion characteristics of microcracks in granite were analyzed. The results show that the higher the initial temperature of granite, the stronger the cold impact of liquid nitrogen on granite, and the faster the rock’s mechanical performance declines. The acoustic emission ringing count is closely related to the development of microcracks in granite, and as the initial temperature of granite increases, the more ringing counts there are, indicating that the huge temperature difference induces more microcracks inside the rock. In addition, the cold impact of liquid nitrogen can effectively promote the fracturing of granite. After liquid nitrogen treatment, the fractal dimension of the granite cross-section increases, the shape of the cross-section becomes rough, and many micropores appear. This study can provide a scientific basis for the engineering application of liquid nitrogen fracturing technology. |
| format | Article |
| id | doaj-art-3d9ae2c31d2c414cac67df417cac1887 |
| institution | OA Journals |
| issn | 1468-8123 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-3d9ae2c31d2c414cac67df417cac18872025-08-20T02:08:19ZengWileyGeofluids1468-81232023-01-01202310.1155/2023/4761786Investigation of Rock Mechanical Properties under Liquid Nitrogen EnvironmentLinchao Wang0Xin Liang1Xuyang Shi2Jianyong Han3Yang Chen4Wan Zhang5School of Civil Engineering and ArchitectureSchool of Civil Engineering and ArchitectureSchool of Mechanics and Civil EngineeringSchool of Civil EngineeringSchool of Civil Engineering and ArchitectureSchool of Civil Engineering and ArchitectureIn order to promote sustainable energy development and reduce the impact of fossil fuels on the environment, it is crucial to strengthen the development and utilization of clean and renewable geothermal energy. Liquid nitrogen fracturing, as an emerging waterless fracturing technology, has outstanding advantages in rock fracturing effect and thermal exchange ability with hot dry rock and is more environmentally friendly. In order to evaluate the influence of liquid nitrogen on the mechanical properties, acoustic emission characteristics, and cross-sectional crack propagation characteristics of granite at different initial temperatures, this paper carried out three-point bending tests and acoustic emission detection on granite treated by high-temperature heating and liquid nitrogen cooling. Finally, based on the cross-sectional scanning test, the expansion characteristics of microcracks in granite were analyzed. The results show that the higher the initial temperature of granite, the stronger the cold impact of liquid nitrogen on granite, and the faster the rock’s mechanical performance declines. The acoustic emission ringing count is closely related to the development of microcracks in granite, and as the initial temperature of granite increases, the more ringing counts there are, indicating that the huge temperature difference induces more microcracks inside the rock. In addition, the cold impact of liquid nitrogen can effectively promote the fracturing of granite. After liquid nitrogen treatment, the fractal dimension of the granite cross-section increases, the shape of the cross-section becomes rough, and many micropores appear. This study can provide a scientific basis for the engineering application of liquid nitrogen fracturing technology.http://dx.doi.org/10.1155/2023/4761786 |
| spellingShingle | Linchao Wang Xin Liang Xuyang Shi Jianyong Han Yang Chen Wan Zhang Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment Geofluids |
| title | Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment |
| title_full | Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment |
| title_fullStr | Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment |
| title_full_unstemmed | Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment |
| title_short | Investigation of Rock Mechanical Properties under Liquid Nitrogen Environment |
| title_sort | investigation of rock mechanical properties under liquid nitrogen environment |
| url | http://dx.doi.org/10.1155/2023/4761786 |
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