Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method
Most instability damage in rock engineering results from the accumulation of microcracks. Fracture tests were conducted in I/II mixed mode using semi-circular bending (SCB) Specimens comprising coal, sandy mudstone, and sandstone with five different pre-fracture angles ( β ). The evolution of fractu...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2025-09-01
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| Series: | Energy Exploration & Exploitation |
| Online Access: | https://doi.org/10.1177/01445987251341998 |
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| author | Baoyan Zhi Zitao Yao Guanchao Ma Shichang Liang Binchang Wang |
| author_facet | Baoyan Zhi Zitao Yao Guanchao Ma Shichang Liang Binchang Wang |
| author_sort | Baoyan Zhi |
| collection | DOAJ |
| description | Most instability damage in rock engineering results from the accumulation of microcracks. Fracture tests were conducted in I/II mixed mode using semi-circular bending (SCB) Specimens comprising coal, sandy mudstone, and sandstone with five different pre-fracture angles ( β ). The evolution of fracture processes and micro-deformation field in rocks were analyzed using digital image calculation method (DICM) and acoustic emission (AE) monitoring. The findings indicate that as β increases, K I gradually decreases, while K II initially increases and then decreases with β growth. Integrating load force-time curves with AE signals reveals three stages in the fracture processes of coal, sandy mudstone, and sandstone: crack initiation, stable crack expansion, and destabilization damage. Furthermore, a comprehensive comparison confirms that experimental results of fracture toughness ( K eff ) for the three rock specimens in I/II hybrid crack mode are consistent with the principles of the modified maximum circumferential stress (MMTS) theory. |
| format | Article |
| id | doaj-art-641d7b86e4e84717980f133246d601b1 |
| institution | Kabale University |
| issn | 0144-5987 2048-4054 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Energy Exploration & Exploitation |
| spelling | doaj-art-641d7b86e4e84717980f133246d601b12025-08-20T03:32:37ZengSAGE PublishingEnergy Exploration & Exploitation0144-59872048-40542025-09-014310.1177/01445987251341998Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB methodBaoyan Zhi0Zitao Yao1Guanchao Ma2Shichang Liang3Binchang Wang4 China Coal Shaanxi Energy Chemical Group Co., Ltd, Yulin, China China Coal Shaanxi Energy Chemical Group Co., Ltd, Yulin, China China Coal Shaanxi Yulin Energy and Chemical Co., Ltd, Yulin, China China Coal Shaanxi Yulin Energy and Chemical Co., Ltd, Yulin, China China Coal Shaanxi Yulin Energy and Chemical Co., Ltd, Yulin, ChinaMost instability damage in rock engineering results from the accumulation of microcracks. Fracture tests were conducted in I/II mixed mode using semi-circular bending (SCB) Specimens comprising coal, sandy mudstone, and sandstone with five different pre-fracture angles ( β ). The evolution of fracture processes and micro-deformation field in rocks were analyzed using digital image calculation method (DICM) and acoustic emission (AE) monitoring. The findings indicate that as β increases, K I gradually decreases, while K II initially increases and then decreases with β growth. Integrating load force-time curves with AE signals reveals three stages in the fracture processes of coal, sandy mudstone, and sandstone: crack initiation, stable crack expansion, and destabilization damage. Furthermore, a comprehensive comparison confirms that experimental results of fracture toughness ( K eff ) for the three rock specimens in I/II hybrid crack mode are consistent with the principles of the modified maximum circumferential stress (MMTS) theory.https://doi.org/10.1177/01445987251341998 |
| spellingShingle | Baoyan Zhi Zitao Yao Guanchao Ma Shichang Liang Binchang Wang Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method Energy Exploration & Exploitation |
| title | Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method |
| title_full | Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method |
| title_fullStr | Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method |
| title_full_unstemmed | Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method |
| title_short | Experimental study of hybrid crack of coal-measure rocks with image and acoustic emission monitoring using SCB method |
| title_sort | experimental study of hybrid crack of coal measure rocks with image and acoustic emission monitoring using scb method |
| url | https://doi.org/10.1177/01445987251341998 |
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