Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring
AbstractAn in-depth recognition of the failure characteristics and scale of joints is of great significance for the stability assessment in rock engineering. Unfortunately, due to the close fitting of the upper and lower blocks of the joint under direct shear tests, the shear failure...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-12-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2010/6456423/619162/Failure-Characteristics-and-Scale-in-a-Sandstone |
| _version_ | 1811200015328083968 |
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| author | Chang Liu Guang-Liang Feng Chun Zhu Ding-Ping Xu |
| author_facet | Chang Liu Guang-Liang Feng Chun Zhu Ding-Ping Xu |
| author_sort | Chang Liu |
| collection | DOAJ |
| description |
AbstractAn in-depth recognition of the failure characteristics and scale of joints is of great significance for the stability assessment in rock engineering. Unfortunately, due to the close fitting of the upper and lower blocks of the joint under direct shear tests, the shear failure of joints are difficult to observe directly during the shear process. Thus, in this work, direct shear tests were carried out on sandstone joints subjected to three levels of normal stress while the acoustic emission (AE) in the rock is synchronously monitored. The failure characteristics of rock joints were then investigated by calibrating the AE system and combining them with the AE location results and shear load curves. A method was established to determine the failure scale of the rock joint that uses the AE moment tensor and first law of thermodynamics. The results show that the degree of failure of the rock joints increases as the normal stress increases. Also, the shear failure of the rock joints is localized and occurs synchronously, rather than sequentially in different areas. The average length of the microfractures formed in the shear process correlates with the average mineral grain size. On the other hand, the maximum length of the microfractures appears to have different values depending on the normal stress present. Our results have significant reference value for the precursory identification of shear disaster in engineering rock masses. |
| first_indexed | 2024-04-12T01:57:39Z |
| format | Article |
| id | doaj.art-03ba767022444d2781610977b8693aed |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T01:57:39Z |
| publishDate | 2022-12-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-03ba767022444d2781610977b8693aed2022-12-22T03:52:46ZengGeoScienceWorldLithosphere1941-82641947-42532022-12-012022Special 1010.2113/2022/6456423Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission MonitoringChang Liu0Guang-Liang Feng1http://orcid.org/0000-0001-9231-0732Chun Zhu2http://orcid.org/0000-0001-8473-8931Ding-Ping Xu31 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China cas.cn1 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China cas.cn1 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China cas.cn1 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China cas.cn AbstractAn in-depth recognition of the failure characteristics and scale of joints is of great significance for the stability assessment in rock engineering. Unfortunately, due to the close fitting of the upper and lower blocks of the joint under direct shear tests, the shear failure of joints are difficult to observe directly during the shear process. Thus, in this work, direct shear tests were carried out on sandstone joints subjected to three levels of normal stress while the acoustic emission (AE) in the rock is synchronously monitored. The failure characteristics of rock joints were then investigated by calibrating the AE system and combining them with the AE location results and shear load curves. A method was established to determine the failure scale of the rock joint that uses the AE moment tensor and first law of thermodynamics. The results show that the degree of failure of the rock joints increases as the normal stress increases. Also, the shear failure of the rock joints is localized and occurs synchronously, rather than sequentially in different areas. The average length of the microfractures formed in the shear process correlates with the average mineral grain size. On the other hand, the maximum length of the microfractures appears to have different values depending on the normal stress present. Our results have significant reference value for the precursory identification of shear disaster in engineering rock masses.https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2010/6456423/619162/Failure-Characteristics-and-Scale-in-a-Sandstone |
| spellingShingle | Chang Liu Guang-Liang Feng Chun Zhu Ding-Ping Xu Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring Lithosphere |
| title | Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring |
| title_full | Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring |
| title_fullStr | Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring |
| title_full_unstemmed | Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring |
| title_short | Failure Characteristics and Scale in a Sandstone Joint Subjected to Direct Shear Testing: Experimental Investigation with Acoustic Emission Monitoring |
| title_sort | failure characteristics and scale in a sandstone joint subjected to direct shear testing experimental investigation with acoustic emission monitoring |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2010/6456423/619162/Failure-Characteristics-and-Scale-in-a-Sandstone |
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