Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes
To obtain the effect of fracture failure mechanics characteristics and behavior of brittle rock masses on the compound factors of fissure openings and inclination, uniaxial loading tests were performed on single-fissured rock-mass specimens with different openings using a rock mechanics test machine...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2023-08-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0148576 |
| _version_ | 1797689662982062080 |
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| author | Jiajun Zeng Qiyun Wang Qingqing Shen Qiang Zeng Zhaohui Pang |
| author_facet | Jiajun Zeng Qiyun Wang Qingqing Shen Qiang Zeng Zhaohui Pang |
| author_sort | Jiajun Zeng |
| collection | DOAJ |
| description | To obtain the effect of fracture failure mechanics characteristics and behavior of brittle rock masses on the compound factors of fissure openings and inclination, uniaxial loading tests were performed on single-fissured rock-mass specimens with different openings using a rock mechanics test machine. The test results show that with the increase in fissure openings, the fissured rock-mass peak strength variation behavior with the increase in fissure inclination angle changes from first decreasing and then increasing to gradually increasing, and the angle at the minimum value of peak strength shifts from 45° to 0°. At the same fissure angle, the peak strength of the fissured rock mass decreases with the increase in the fissure opening size. The greater the opening size of the prefabricated fissure, the smaller the peak strength of the fissured rock mass and the greater the influence of changes in the fissure inclination angle. The elastic modulus of the fissured rock-mass specimen shows a positive correlation with the fissure inclination angle and a negative correlation with the fissure opening size. Combined with the neighborhood stress field analysis of the open fissure tip, the criterion of composite fracture under tension failure is established, and the linear relationship between the stress intensity factors KI and KII is verified. The criterion of composite fracture of open fissures under shear failure is also identified, which is based on the linear relationship between the stress intensity factors. |
| first_indexed | 2024-03-12T01:48:35Z |
| format | Article |
| id | doaj.art-b04e0d1e5bbd4b84a453d07590b20440 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-12T01:48:35Z |
| publishDate | 2023-08-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-b04e0d1e5bbd4b84a453d07590b204402023-09-08T16:03:30ZengAIP Publishing LLCAIP Advances2158-32262023-08-01138085104085104-910.1063/5.0148576Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizesJiajun Zeng0Qiyun Wang1Qingqing Shen2Qiang Zeng3Zhaohui Pang4College of Civil and Construction Engineering, Hunan Institute of Technology, Hengyang 421002, ChinaCollege of Civil and Construction Engineering, Hunan Institute of Technology, Hengyang 421002, ChinaCollege of Civil and Construction Engineering, Hunan Institute of Technology, Hengyang 421002, ChinaCollege of Civil and Construction Engineering, Hunan Institute of Technology, Hengyang 421002, ChinaCollege of Civil and Construction Engineering, Hunan Institute of Technology, Hengyang 421002, ChinaTo obtain the effect of fracture failure mechanics characteristics and behavior of brittle rock masses on the compound factors of fissure openings and inclination, uniaxial loading tests were performed on single-fissured rock-mass specimens with different openings using a rock mechanics test machine. The test results show that with the increase in fissure openings, the fissured rock-mass peak strength variation behavior with the increase in fissure inclination angle changes from first decreasing and then increasing to gradually increasing, and the angle at the minimum value of peak strength shifts from 45° to 0°. At the same fissure angle, the peak strength of the fissured rock mass decreases with the increase in the fissure opening size. The greater the opening size of the prefabricated fissure, the smaller the peak strength of the fissured rock mass and the greater the influence of changes in the fissure inclination angle. The elastic modulus of the fissured rock-mass specimen shows a positive correlation with the fissure inclination angle and a negative correlation with the fissure opening size. Combined with the neighborhood stress field analysis of the open fissure tip, the criterion of composite fracture under tension failure is established, and the linear relationship between the stress intensity factors KI and KII is verified. The criterion of composite fracture of open fissures under shear failure is also identified, which is based on the linear relationship between the stress intensity factors.http://dx.doi.org/10.1063/5.0148576 |
| spellingShingle | Jiajun Zeng Qiyun Wang Qingqing Shen Qiang Zeng Zhaohui Pang Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes AIP Advances |
| title | Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| title_full | Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| title_fullStr | Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| title_full_unstemmed | Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| title_short | Mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| title_sort | mechanical characteristics and fracture mechanisms of fissured rock mass samples with various opening sizes |
| url | http://dx.doi.org/10.1063/5.0148576 |
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