Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test
Cohesion and friction angle are important indicators of shear strength in mining engineering. Indoor testing methods are detached from the actual state of the rock mass and affected by disturbances and significant dimensional effects that do not fully reflect the shear strength of the rock mass itse...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/5/618 |
| _version_ | 1797497584487497728 |
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| author | Jianhua Hu Rui Xiang Guanping Wen Shaowei Ma Le Pang |
| author_facet | Jianhua Hu Rui Xiang Guanping Wen Shaowei Ma Le Pang |
| author_sort | Jianhua Hu |
| collection | DOAJ |
| description | Cohesion and friction angle are important indicators of shear strength in mining engineering. Indoor testing methods are detached from the actual state of the rock mass and affected by disturbances and significant dimensional effects that do not fully reflect the shear strength of the rock mass itself. In situ borehole shear testing is of great practical importance because of its low disturbance and high speed. In this paper, a new testing device based on the principle of a rock borehole shear tester was designed to simulate the shear test in the laboratory. Seven shear indenters were designed to test the effect of different tooth heights, spacing, and angles on the shear strength of rock-like specimens, and the damage surface was scanned in three dimensions and compared with conventional triaxial tests and compression shear tests. The results show that as the tooth height increases, the flatness of the press-in damage surface increases, and the results will be closer to the press-shear test. As the spacing increases, the maximum damage angle and the damage surface between the grooves gradually decrease. The tooth angle has little effect on the friction angle, but cohesion decreases significantly when exceeds 60°. |
| first_indexed | 2024-03-10T03:21:19Z |
| format | Article |
| id | doaj.art-9a8a75a7e5ad4003acee9c6f4cb8e329 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T03:21:19Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-9a8a75a7e5ad4003acee9c6f4cb8e3292023-11-23T12:19:31ZengMDPI AGMinerals2075-163X2022-05-0112561810.3390/min12050618Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength TestJianhua Hu0Rui Xiang1Guanping Wen2Shaowei Ma3Le Pang4School of Resources and Safety Engineering, Central South University, Changsha 410006, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410006, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410006, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410006, ChinaChina Railway Shanghai Design Institute Group Co., Ltd., Shanghai 200070, ChinaCohesion and friction angle are important indicators of shear strength in mining engineering. Indoor testing methods are detached from the actual state of the rock mass and affected by disturbances and significant dimensional effects that do not fully reflect the shear strength of the rock mass itself. In situ borehole shear testing is of great practical importance because of its low disturbance and high speed. In this paper, a new testing device based on the principle of a rock borehole shear tester was designed to simulate the shear test in the laboratory. Seven shear indenters were designed to test the effect of different tooth heights, spacing, and angles on the shear strength of rock-like specimens, and the damage surface was scanned in three dimensions and compared with conventional triaxial tests and compression shear tests. The results show that as the tooth height increases, the flatness of the press-in damage surface increases, and the results will be closer to the press-shear test. As the spacing increases, the maximum damage angle and the damage surface between the grooves gradually decrease. The tooth angle has little effect on the friction angle, but cohesion decreases significantly when exceeds 60°.https://www.mdpi.com/2075-163X/12/5/618shear indenterrock borehole shear testindoor testsshear strength index3D scan |
| spellingShingle | Jianhua Hu Rui Xiang Guanping Wen Shaowei Ma Le Pang Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test Minerals shear indenter rock borehole shear test indoor tests shear strength index 3D scan |
| title | Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test |
| title_full | Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test |
| title_fullStr | Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test |
| title_full_unstemmed | Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test |
| title_short | Study on the Influence of Shear Indenter Parameters on the In Situ Shear Strength Test |
| title_sort | study on the influence of shear indenter parameters on the in situ shear strength test |
| topic | shear indenter rock borehole shear test indoor tests shear strength index 3D scan |
| url | https://www.mdpi.com/2075-163X/12/5/618 |
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