Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures
AbstractIn this study, multilevel and conventional unloading triaxial compression tests under different confining pressures are separately carried out to systematically reveal the deformation, energy evolution, and fracture characteristics of sandstone samples. Results show that unde...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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GeoScienceWorld
2022-09-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/4926735/616461/Energy-Chaos-Characteristic-Evolution-Analysis-of |
| _version_ | 1811177692689596416 |
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| author | Shuang Dang Jing Bi Yu Zhao Chaolin Wang Kaizong Xia Fei Gan |
| author_facet | Shuang Dang Jing Bi Yu Zhao Chaolin Wang Kaizong Xia Fei Gan |
| author_sort | Shuang Dang |
| collection | DOAJ |
| description |
AbstractIn this study, multilevel and conventional unloading triaxial compression tests under different confining pressures are separately carried out to systematically reveal the deformation, energy evolution, and fracture characteristics of sandstone samples. Results show that under the multilevel unloading condition, the increase of the initial confining pressure has a more obvious inhibitory effect on the radial strain of sandstone, and the samples can fully exhibit elastic deformation and partial plastic deformation, showing obvious plastic characteristics. The radial energy growth factor is more sensitive than the axial energy growth factor during the process of confining pressure unloading, and the larger the initial confining pressure, the earlier the period-doubling bifurcation region and chaotic region are reached. To better understand the deformation and failure process of rock during engineering excavation, it is necessary to establish a constitutive relation describing the mechanical properties of rock. The three-step failure mode also proves that there are tensile and shear fractures in sandstone samples, in which the effects of tensile stress and shear stress are more or less interdependent in the failure process. It can be seen that multilevel unloading makes the energy conversion more adequate and reduces the sudden release of energy when the rock fails, reducing the possibility of rockburst and making the excavation unloading process safer. This will deepen the understanding of rock failure behavior and contribute to the better application of energy characteristics to relevant engineering practices. |
| first_indexed | 2024-04-11T06:05:23Z |
| format | Article |
| id | doaj.art-998f15910fde460184a23df9acbfa61e |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-11T06:05:23Z |
| publishDate | 2022-09-01 |
| publisher | GeoScienceWorld |
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| series | Lithosphere |
| spelling | doaj.art-998f15910fde460184a23df9acbfa61e2022-12-22T04:41:30ZengGeoScienceWorldLithosphere1941-82641947-42532022-09-012022Special 1110.2113/2022/4926735Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining PressuresShuang Dang0Jing Bi1Yu Zhao2http://orcid.org/0000-0002-7428-5876Chaolin Wang3Kaizong Xia4Fei Gan51 College of Civil Engineering Guizhou University Guiyang Guizhou 550025 China gzu.edu.cn1 College of Civil Engineering Guizhou University Guiyang Guizhou 550025 China gzu.edu.cn1 College of Civil Engineering Guizhou University Guiyang Guizhou 550025 China gzu.edu.cn1 College of Civil Engineering Guizhou University Guiyang Guizhou 550025 China gzu.edu.cn3 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071 China cas.cn1 College of Civil Engineering Guizhou University Guiyang Guizhou 550025 China gzu.edu.cn AbstractIn this study, multilevel and conventional unloading triaxial compression tests under different confining pressures are separately carried out to systematically reveal the deformation, energy evolution, and fracture characteristics of sandstone samples. Results show that under the multilevel unloading condition, the increase of the initial confining pressure has a more obvious inhibitory effect on the radial strain of sandstone, and the samples can fully exhibit elastic deformation and partial plastic deformation, showing obvious plastic characteristics. The radial energy growth factor is more sensitive than the axial energy growth factor during the process of confining pressure unloading, and the larger the initial confining pressure, the earlier the period-doubling bifurcation region and chaotic region are reached. To better understand the deformation and failure process of rock during engineering excavation, it is necessary to establish a constitutive relation describing the mechanical properties of rock. The three-step failure mode also proves that there are tensile and shear fractures in sandstone samples, in which the effects of tensile stress and shear stress are more or less interdependent in the failure process. It can be seen that multilevel unloading makes the energy conversion more adequate and reduces the sudden release of energy when the rock fails, reducing the possibility of rockburst and making the excavation unloading process safer. This will deepen the understanding of rock failure behavior and contribute to the better application of energy characteristics to relevant engineering practices.https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/4926735/616461/Energy-Chaos-Characteristic-Evolution-Analysis-of |
| spellingShingle | Shuang Dang Jing Bi Yu Zhao Chaolin Wang Kaizong Xia Fei Gan Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures Lithosphere |
| title | Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures |
| title_full | Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures |
| title_fullStr | Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures |
| title_full_unstemmed | Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures |
| title_short | Energy Chaos Characteristic Evolution Analysis of Sandstones during Multilevel Unloading Subject to Different Confining Pressures |
| title_sort | energy chaos characteristic evolution analysis of sandstones during multilevel unloading subject to different confining pressures |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2022/Special%2011/4926735/616461/Energy-Chaos-Characteristic-Evolution-Analysis-of |
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