3D morphology and formation mechanism of fractures developed by true triaxial stress
As main part of underground rock mass, the three-dimensional (3D) morphology of natural fractures plays an important role in rock mass stability. Based on previous studies on 3D morphology, this study probes into the law and mechanism regarding the influence of the confining pressure constraints on...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | International Journal of Mining Science and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268622000969 |
| _version_ | 1797977755784052736 |
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| author | Bing Chen Baotang Shen Shichuan Zhang Yangyang Li Haiyang Jiang |
| author_facet | Bing Chen Baotang Shen Shichuan Zhang Yangyang Li Haiyang Jiang |
| author_sort | Bing Chen |
| collection | DOAJ |
| description | As main part of underground rock mass, the three-dimensional (3D) morphology of natural fractures plays an important role in rock mass stability. Based on previous studies on 3D morphology, this study probes into the law and mechanism regarding the influence of the confining pressure constraints on 3D morphological features of natural fractures. First, fracture surfaces were obtained by true triaxial compression test and 3D laser scanning. Then 3D morphological parameters of fractures were calculated by using Grasselli’s model. The results show that the failure mode of granites developed by true triaxial stress can be categorized into tension failure and shear failure. Based on the spatial position of fractures, they can be divided into tension fracture surface, S-1 shear fracture surface, and S-2 shear fracture surface. Micro-failure of the tension fracture surface is dominated by mainly intergranular fracture; the maximum height of asperities on the fracture surface and the 3D roughness of fracture surfaces are influenced by σ3 only and they are greater than those of shear fracture surfaces, a lower overall uniformity than tension fracture surface. S-1 shear fracture surface and S-2 shear fracture surface are dominated by intragranular and intergranular coupling fracture. The maximum height of asperities on the fracture surface and 3D roughness of fracture surface are affected by σ1, σ2, and σ3. With the increase of σ2 or σ3, the cutting off of asperities on the fracture surface becomes more common, the maximum height of asperities and 3D roughness of fracture surface further decrease, and the overall uniformity gets further improved. The experimental results are favorable for selecting technical parameters of enhanced geothermal development and the safety of underground mine engineering. |
| first_indexed | 2024-04-11T05:12:02Z |
| format | Article |
| id | doaj.art-9cd0aaceee0e4fc1b2bd731b8ffea574 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-04-11T05:12:02Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-9cd0aaceee0e4fc1b2bd731b8ffea5742022-12-25T04:17:48ZengElsevierInternational Journal of Mining Science and Technology2095-26862022-11-01326127312843D morphology and formation mechanism of fractures developed by true triaxial stressBing Chen0Baotang Shen1Shichuan Zhang2Yangyang Li3Haiyang Jiang4State Key Laboratory of Mining Disaster Prevention and Control Co-founded, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-founded, Shandong University of Science and Technology, Qingdao 266590, China; CSIRO Mineral Resources, Queensland 4069, Australia; Corresponding authors.State Key Laboratory of Mining Disaster Prevention and Control Co-founded, Shandong University of Science and Technology, Qingdao 266590, China; Corresponding authors.State Key Laboratory of Mining Disaster Prevention and Control Co-founded, Shandong University of Science and Technology, Qingdao 266590, ChinaNo.1 Institute of Geology and Mineral Resource Exploration of Shandong Province, Jinan 250010, China; College of New Energy and Environment, Jilin University, Changchun 130012, ChinaAs main part of underground rock mass, the three-dimensional (3D) morphology of natural fractures plays an important role in rock mass stability. Based on previous studies on 3D morphology, this study probes into the law and mechanism regarding the influence of the confining pressure constraints on 3D morphological features of natural fractures. First, fracture surfaces were obtained by true triaxial compression test and 3D laser scanning. Then 3D morphological parameters of fractures were calculated by using Grasselli’s model. The results show that the failure mode of granites developed by true triaxial stress can be categorized into tension failure and shear failure. Based on the spatial position of fractures, they can be divided into tension fracture surface, S-1 shear fracture surface, and S-2 shear fracture surface. Micro-failure of the tension fracture surface is dominated by mainly intergranular fracture; the maximum height of asperities on the fracture surface and the 3D roughness of fracture surfaces are influenced by σ3 only and they are greater than those of shear fracture surfaces, a lower overall uniformity than tension fracture surface. S-1 shear fracture surface and S-2 shear fracture surface are dominated by intragranular and intergranular coupling fracture. The maximum height of asperities on the fracture surface and 3D roughness of fracture surface are affected by σ1, σ2, and σ3. With the increase of σ2 or σ3, the cutting off of asperities on the fracture surface becomes more common, the maximum height of asperities and 3D roughness of fracture surface further decrease, and the overall uniformity gets further improved. The experimental results are favorable for selecting technical parameters of enhanced geothermal development and the safety of underground mine engineering.http://www.sciencedirect.com/science/article/pii/S2095268622000969True triaxial stressFailure modeFracture angle3D morphologyMicro-fracture |
| spellingShingle | Bing Chen Baotang Shen Shichuan Zhang Yangyang Li Haiyang Jiang 3D morphology and formation mechanism of fractures developed by true triaxial stress International Journal of Mining Science and Technology True triaxial stress Failure mode Fracture angle 3D morphology Micro-fracture |
| title | 3D morphology and formation mechanism of fractures developed by true triaxial stress |
| title_full | 3D morphology and formation mechanism of fractures developed by true triaxial stress |
| title_fullStr | 3D morphology and formation mechanism of fractures developed by true triaxial stress |
| title_full_unstemmed | 3D morphology and formation mechanism of fractures developed by true triaxial stress |
| title_short | 3D morphology and formation mechanism of fractures developed by true triaxial stress |
| title_sort | 3d morphology and formation mechanism of fractures developed by true triaxial stress |
| topic | True triaxial stress Failure mode Fracture angle 3D morphology Micro-fracture |
| url | http://www.sciencedirect.com/science/article/pii/S2095268622000969 |
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