Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure
AbstractRock bridge of jointed rock plays a key role in its instability failure and has great influence on underground engineering. In this paper, the direct shear tests of jointed rocks with different rock bridge lengths are carried out, and the mechanical properties, acoustic emiss...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-06-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/7350885/614821/Study-on-Mechanical-and-Acoustic-Emission |
| _version_ | 1811200045622493184 |
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| author | Jianchao Wang Yan Zhang Changan Qin Yaohui Gao Zhaofeng Wang Guofeng Zhang |
| author_facet | Jianchao Wang Yan Zhang Changan Qin Yaohui Gao Zhaofeng Wang Guofeng Zhang |
| author_sort | Jianchao Wang |
| collection | DOAJ |
| description |
AbstractRock bridge of jointed rock plays a key role in its instability failure and has great influence on underground engineering. In this paper, the direct shear tests of jointed rocks with different rock bridge lengths are carried out, and the mechanical properties, acoustic emission (AE) characteristics, and fracture mechanism during the failure of rock bridge are studied. The results show that the shear strength increases with the increase of normal stress. When the rock bridge is long, cohesion c plays a leading role to control the failure of jointed rock; on the contrary, the internal friction angle φ plays a leading role. AE count rate, cumulative AE counts, and peak AE energy rate increase with the increase of rock bridge length. With the increase of rock bridge length, peak AE energy rate and AE count rate occur earlier. Considering the influence of rock bridge length, the fracture criterion and crack growth angle of shear fracture are derived based on linear elastic fracture mechanics. The theoretically calculated result is consistent with the experimental result. The research in this paper can provide relevant theoretical basis and useful reference for the instability and failure analysis of jointed rock. |
| first_indexed | 2024-04-12T01:57:10Z |
| format | Article |
| id | doaj.art-8031729e028046d5b3b82b4534a525b0 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-12T01:57:10Z |
| publishDate | 2022-06-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-8031729e028046d5b3b82b4534a525b02022-12-22T03:52:46ZengGeoScienceWorldLithosphere1941-82641947-42532022-06-012022Special 1110.2113/2022/7350885Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock FailureJianchao Wang0http://orcid.org/0000-0003-1264-0454Yan Zhang1http://orcid.org/0000-0002-4791-7081Changan Qin2Yaohui Gao3Zhaofeng Wang4Guofeng Zhang51 State Key Laboratory of Geohazard Prevention and Environment Protection Chengdu University of Technology Chengdu 610059 Sichuan China cdut.edu.cn1 State Key Laboratory of Geohazard Prevention and Environment Protection Chengdu University of Technology Chengdu 610059 Sichuan China cdut.edu.cn2 Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material Beijing University of Civil Engineering and Architecture Beijing 100044 Beijing China bucea.edu.cn3 PowerChina Huadong Engineering Corporation Limited Hangzhou 310014 Zhejiang China ecidi.com4 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 Geohazard Prevention and Environment Protection Chengdu University of Technology Chengdu 610059 Sichuan China cdut.edu.cn AbstractRock bridge of jointed rock plays a key role in its instability failure and has great influence on underground engineering. In this paper, the direct shear tests of jointed rocks with different rock bridge lengths are carried out, and the mechanical properties, acoustic emission (AE) characteristics, and fracture mechanism during the failure of rock bridge are studied. The results show that the shear strength increases with the increase of normal stress. When the rock bridge is long, cohesion c plays a leading role to control the failure of jointed rock; on the contrary, the internal friction angle φ plays a leading role. AE count rate, cumulative AE counts, and peak AE energy rate increase with the increase of rock bridge length. With the increase of rock bridge length, peak AE energy rate and AE count rate occur earlier. Considering the influence of rock bridge length, the fracture criterion and crack growth angle of shear fracture are derived based on linear elastic fracture mechanics. The theoretically calculated result is consistent with the experimental result. The research in this paper can provide relevant theoretical basis and useful reference for the instability and failure analysis of jointed rock.https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/7350885/614821/Study-on-Mechanical-and-Acoustic-Emission |
| spellingShingle | Jianchao Wang Yan Zhang Changan Qin Yaohui Gao Zhaofeng Wang Guofeng Zhang Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure Lithosphere |
| title | Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure |
| title_full | Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure |
| title_fullStr | Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure |
| title_full_unstemmed | Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure |
| title_short | Study on Mechanical and Acoustic Emission Characteristics of the Influence of Rock Bridge Length on Rock Failure |
| title_sort | study on mechanical and acoustic emission characteristics of the influence of rock bridge length on rock failure |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/7350885/614821/Study-on-Mechanical-and-Acoustic-Emission |
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