A simple permanent deformation model of rockfill materials
Existing experimental results have shown that using a semi-log linear relationship between the permanent volumetric strain and cyclic number underestimates the volumetric deformation of rockfill materials with a large cyclic number, and that the error increases with the confining pressure. The exist...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2018-10-01
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| Series: | Water Science and Engineering |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237018300966 |
| _version_ | 1819160851561578496 |
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| author | De-gao Zou Jing-mao Liu Xian-jing Kong Chen-guang Zhou Qing-po Yang |
| author_facet | De-gao Zou Jing-mao Liu Xian-jing Kong Chen-guang Zhou Qing-po Yang |
| author_sort | De-gao Zou |
| collection | DOAJ |
| description | Existing experimental results have shown that using a semi-log linear relationship between the permanent volumetric strain and cyclic number underestimates the volumetric deformation of rockfill materials with a large cyclic number, and that the error increases with the confining pressure. The existing permanent deformation models are not suitable for the seismic safety analysis of high dams during strong earthquakes. In this study, a series of large-scale triaxial cyclic loading tests of rockfill materials were performed, and a new permanent deformation model of rockfill materials was developed and validated with three kinds of rockfill materials. The results show that the proposed model can properly reflect the general features of the permanent deformation of rockfill materials. The main features of the model are as follows: (1) relations between the cyclic number and permanent volumetric/shear strain are described by hyperbolic functions, which can avoid underestimating the volumetric deformation occurring during strong earthquakes; (2) the model can capture the effect of the mean effective stress on the permanent volumetric strain, with greater confining pressure correlating to greater permanent volumetric deformation, and the permanent volumetric strain under low confining pressure near the dam crest can be well represented; and (3) the model can reflect the effect of the consolidation stress ratio on the permanent shear strain. Keywords: Rockfill materials, Permanent deformation, Triaxial test, Cyclic loading, Consolidation stress ratio |
| first_indexed | 2024-12-22T17:03:01Z |
| format | Article |
| id | doaj.art-bee1be50426f475ba7b93c221637d5f0 |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-12-22T17:03:01Z |
| publishDate | 2018-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-bee1be50426f475ba7b93c221637d5f02022-12-21T18:19:18ZengElsevierWater Science and Engineering1674-23702018-10-01114302309A simple permanent deformation model of rockfill materialsDe-gao Zou0Jing-mao Liu1Xian-jing Kong2Chen-guang Zhou3Qing-po Yang4State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, ChinaState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; Corresponding author.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, ChinaState Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, ChinaShanghai Municipal Engineering Design Institute Co., Ltd., Shanghai 200092, ChinaExisting experimental results have shown that using a semi-log linear relationship between the permanent volumetric strain and cyclic number underestimates the volumetric deformation of rockfill materials with a large cyclic number, and that the error increases with the confining pressure. The existing permanent deformation models are not suitable for the seismic safety analysis of high dams during strong earthquakes. In this study, a series of large-scale triaxial cyclic loading tests of rockfill materials were performed, and a new permanent deformation model of rockfill materials was developed and validated with three kinds of rockfill materials. The results show that the proposed model can properly reflect the general features of the permanent deformation of rockfill materials. The main features of the model are as follows: (1) relations between the cyclic number and permanent volumetric/shear strain are described by hyperbolic functions, which can avoid underestimating the volumetric deformation occurring during strong earthquakes; (2) the model can capture the effect of the mean effective stress on the permanent volumetric strain, with greater confining pressure correlating to greater permanent volumetric deformation, and the permanent volumetric strain under low confining pressure near the dam crest can be well represented; and (3) the model can reflect the effect of the consolidation stress ratio on the permanent shear strain. Keywords: Rockfill materials, Permanent deformation, Triaxial test, Cyclic loading, Consolidation stress ratiohttp://www.sciencedirect.com/science/article/pii/S1674237018300966 |
| spellingShingle | De-gao Zou Jing-mao Liu Xian-jing Kong Chen-guang Zhou Qing-po Yang A simple permanent deformation model of rockfill materials Water Science and Engineering |
| title | A simple permanent deformation model of rockfill materials |
| title_full | A simple permanent deformation model of rockfill materials |
| title_fullStr | A simple permanent deformation model of rockfill materials |
| title_full_unstemmed | A simple permanent deformation model of rockfill materials |
| title_short | A simple permanent deformation model of rockfill materials |
| title_sort | simple permanent deformation model of rockfill materials |
| url | http://www.sciencedirect.com/science/article/pii/S1674237018300966 |
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