Failure strength and fracture characteristics of rock with discontinuity under indirect tension
Large-scale discontinuities can significantly affect the mechanical properties of rock masses. However, the tensile behavior of rock discontinuities is often less investigated. To study the statistical characteristics of failure strength and fracture characteristics of rock discontinuities, Brazilia...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775522000609 |
| _version_ | 1811186709150302208 |
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| author | Dongya Han Jianbo Zhu Yat-Fai Leung |
| author_facet | Dongya Han Jianbo Zhu Yat-Fai Leung |
| author_sort | Dongya Han |
| collection | DOAJ |
| description | Large-scale discontinuities can significantly affect the mechanical properties of rock masses. However, the tensile behavior of rock discontinuities is often less investigated. To study the statistical characteristics of failure strength and fracture characteristics of rock discontinuities, Brazilian disc tests were conducted on limestone specimens with a single natural discontinuity at different load-discontinuity angles (β). In this study, β=0° and β=90° correspond to the discontinuity parallel and perpendicular to loading direction, respectively. The results show that Brazilian failure strength (BFS) can reasonably represent the tensile strength of rock with discontinuities, by comparing the BFS and tensile stress in the disc center at peak force. The two-parameter Weibull distribution can capture the statistical BFS characteristics of rock discontinuities parallel to loading direction (β=0°) and at different load-discontinuity angles (β≠0°). All specimens with discontinuity at different load-discontinuity angles show more plastic deformational behaviour than intact rock specimen. With increasing β, the mean BFS of limestone with discontinuity increases before reaching a plateau at β=45°. The single plane of weakness theory best explains the BFS of fractured limestone with β. Only a specific segment of pre-existing rock discontinuity could affect the fracture process. When β=0°, interfacial cracks and alternative cracks formed. When β≠0°, mixed failure mode with shear and tensile failure occurred, particularly when β=30° and β=60°. The findings can contribute to better understanding the failure and fracture characteristics of rock with discontinuities, particularly the interaction of pre-existing discontinuities with stress-induced fracturing. |
| first_indexed | 2024-04-11T13:49:37Z |
| format | Article |
| id | doaj.art-dc7757e44727450db3168e76731c7c7e |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-04-11T13:49:37Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-dc7757e44727450db3168e76731c7c7e2022-12-22T04:20:43ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552022-12-0114618101822Failure strength and fracture characteristics of rock with discontinuity under indirect tensionDongya Han0Jianbo Zhu1Yat-Fai Leung2School of Resources and Safety Engineering, Central South University, Changsha, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, ChinaGuangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, China; Corresponding author.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China; Corresponding author.Large-scale discontinuities can significantly affect the mechanical properties of rock masses. However, the tensile behavior of rock discontinuities is often less investigated. To study the statistical characteristics of failure strength and fracture characteristics of rock discontinuities, Brazilian disc tests were conducted on limestone specimens with a single natural discontinuity at different load-discontinuity angles (β). In this study, β=0° and β=90° correspond to the discontinuity parallel and perpendicular to loading direction, respectively. The results show that Brazilian failure strength (BFS) can reasonably represent the tensile strength of rock with discontinuities, by comparing the BFS and tensile stress in the disc center at peak force. The two-parameter Weibull distribution can capture the statistical BFS characteristics of rock discontinuities parallel to loading direction (β=0°) and at different load-discontinuity angles (β≠0°). All specimens with discontinuity at different load-discontinuity angles show more plastic deformational behaviour than intact rock specimen. With increasing β, the mean BFS of limestone with discontinuity increases before reaching a plateau at β=45°. The single plane of weakness theory best explains the BFS of fractured limestone with β. Only a specific segment of pre-existing rock discontinuity could affect the fracture process. When β=0°, interfacial cracks and alternative cracks formed. When β≠0°, mixed failure mode with shear and tensile failure occurred, particularly when β=30° and β=60°. The findings can contribute to better understanding the failure and fracture characteristics of rock with discontinuities, particularly the interaction of pre-existing discontinuities with stress-induced fracturing.http://www.sciencedirect.com/science/article/pii/S1674775522000609Brazilian failure strength (BFS)Weibull distributionRock discontinuityAnisotropy |
| spellingShingle | Dongya Han Jianbo Zhu Yat-Fai Leung Failure strength and fracture characteristics of rock with discontinuity under indirect tension Journal of Rock Mechanics and Geotechnical Engineering Brazilian failure strength (BFS) Weibull distribution Rock discontinuity Anisotropy |
| title | Failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| title_full | Failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| title_fullStr | Failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| title_full_unstemmed | Failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| title_short | Failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| title_sort | failure strength and fracture characteristics of rock with discontinuity under indirect tension |
| topic | Brazilian failure strength (BFS) Weibull distribution Rock discontinuity Anisotropy |
| url | http://www.sciencedirect.com/science/article/pii/S1674775522000609 |
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