Research on the mechanical characteristics of granite failure process under true triaxial stress path
The true triaxial loading and unloading tests on granite were conducted to obtain the mechanical characteristics of the granite in the construction area of an underground cavern. The stability of the surrounding rock, the characteristic stress, the failure mode and the brittleness characteristics we...
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| Format: | Article |
| Language: | English |
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SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717
2021-08-01
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| Series: | Rock and Soil Mechanics |
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| Online Access: | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2021.5110 |
| _version_ | 1828293407747866624 |
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| author | LIU Jie ZHANG Li-ming CONG Yu WANG Zai-quan |
| author_facet | LIU Jie ZHANG Li-ming CONG Yu WANG Zai-quan |
| author_sort | LIU Jie |
| collection | DOAJ |
| description | The true triaxial loading and unloading tests on granite were conducted to obtain the mechanical characteristics of the granite in the construction area of an underground cavern. The stability of the surrounding rock, the characteristic stress, the failure mode and the brittleness characteristics were mainly analyzed in this work. In addition, the evolution laws of total energy and dissipated energy with axial strain were explored. Results show that under the true triaxial loading and unloading stress paths, the failure modes of granite are both tensile and shear composite failure, and characteristics of high damage stress and brittleness are obviously observed. A new brittleness index is proposed to evaluate rock brittleness by using volumetric strain curve. It is found that the brittleness of granite is higher under unloading conditions. In the true triaxial loading test, the change trend of total energy with axial strain goes through three stages: slow increase, rapid increase, and steady increase. In the true triaxial unloading test, the dissipated energy increases rapidly at the moment of unloading, and its proportion in the energy distribution exceeds the elastic strain energy, which becomes the main energy consumption. The energy dissipation value of the granite sample in the loading test is obviously greater than that in the unloading test. It indicates that more energy is required for samples under the loading path to produce damage, which is safer than the unloading path. The particle flow PFC3D is used to simulate the true triaxial loading and unloading test of granite in this study. The failure mode and the crack distribution of the numerical simulation results are basically consistent with results of the laboratory test. Then the numerical model is used to simulate the rapid unloading failure process of granite. It is found that the rock sample particle ejection damage will occur at the end of the model, similar to a rock burst. |
| first_indexed | 2024-04-13T11:22:25Z |
| format | Article |
| id | doaj.art-93b5a8189e3d4fc687bffcba1e886791 |
| institution | Directory Open Access Journal |
| issn | 1000-7598 |
| language | English |
| last_indexed | 2024-04-13T11:22:25Z |
| publishDate | 2021-08-01 |
| publisher | SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717 |
| record_format | Article |
| series | Rock and Soil Mechanics |
| spelling | doaj.art-93b5a8189e3d4fc687bffcba1e8867912022-12-22T02:48:47ZengSCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717Rock and Soil Mechanics1000-75982021-08-012069207710.16285/j.rsm.2021.5110Research on the mechanical characteristics of granite failure process under true triaxial stress path LIU Jie0ZHANG Li-ming1CONG Yu2WANG Zai-quan31. School of Science, Qingdao University of Technology, Qingdao, Shandong 266033, China1. School of Science, Qingdao University of Technology, Qingdao, Shandong 266033, China 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao, Shandong 266033, China1. School of Science, Qingdao University of Technology, Qingdao, Shandong 266033, China 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao, Shandong 266033, China1. School of Science, Qingdao University of Technology, Qingdao, Shandong 266033, China 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao, Shandong 266033, ChinaThe true triaxial loading and unloading tests on granite were conducted to obtain the mechanical characteristics of the granite in the construction area of an underground cavern. The stability of the surrounding rock, the characteristic stress, the failure mode and the brittleness characteristics were mainly analyzed in this work. In addition, the evolution laws of total energy and dissipated energy with axial strain were explored. Results show that under the true triaxial loading and unloading stress paths, the failure modes of granite are both tensile and shear composite failure, and characteristics of high damage stress and brittleness are obviously observed. A new brittleness index is proposed to evaluate rock brittleness by using volumetric strain curve. It is found that the brittleness of granite is higher under unloading conditions. In the true triaxial loading test, the change trend of total energy with axial strain goes through three stages: slow increase, rapid increase, and steady increase. In the true triaxial unloading test, the dissipated energy increases rapidly at the moment of unloading, and its proportion in the energy distribution exceeds the elastic strain energy, which becomes the main energy consumption. The energy dissipation value of the granite sample in the loading test is obviously greater than that in the unloading test. It indicates that more energy is required for samples under the loading path to produce damage, which is safer than the unloading path. The particle flow PFC3D is used to simulate the true triaxial loading and unloading test of granite in this study. The failure mode and the crack distribution of the numerical simulation results are basically consistent with results of the laboratory test. Then the numerical model is used to simulate the rapid unloading failure process of granite. It is found that the rock sample particle ejection damage will occur at the end of the model, similar to a rock burst. http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2021.5110true triaxial testmechanical propertiesenergy evolution |
| spellingShingle | LIU Jie ZHANG Li-ming CONG Yu WANG Zai-quan Research on the mechanical characteristics of granite failure process under true triaxial stress path Rock and Soil Mechanics true triaxial test mechanical properties energy evolution |
| title | Research on the mechanical characteristics of granite failure process under true triaxial stress path |
| title_full | Research on the mechanical characteristics of granite failure process under true triaxial stress path |
| title_fullStr | Research on the mechanical characteristics of granite failure process under true triaxial stress path |
| title_full_unstemmed | Research on the mechanical characteristics of granite failure process under true triaxial stress path |
| title_short | Research on the mechanical characteristics of granite failure process under true triaxial stress path |
| title_sort | research on the mechanical characteristics of granite failure process under true triaxial stress path |
| topic | true triaxial test mechanical properties energy evolution |
| url | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2021.5110 |
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