Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary
Cyclic threshold shear strain is a fundamental property of saturated soils under cyclic loading. To investigate the cyclic threshold shear strain for pore water pressure generation (γtp) and stiffness degradation (γtd), a series of strain-controlled multistage undrained cyclic triaxial tests were ca...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-05-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1184225/full |
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| author | Xing Xiao Dong-Wei Ji Tian-Zhu Hang Zi-Yang Cai Lei Zhang Qi Wu Qi Wu Guo-Xing Chen Guo-Xing Chen |
| author_facet | Xing Xiao Dong-Wei Ji Tian-Zhu Hang Zi-Yang Cai Lei Zhang Qi Wu Qi Wu Guo-Xing Chen Guo-Xing Chen |
| author_sort | Xing Xiao |
| collection | DOAJ |
| description | Cyclic threshold shear strain is a fundamental property of saturated soils under cyclic loading. To investigate the cyclic threshold shear strain for pore water pressure generation (γtp) and stiffness degradation (γtd), a series of strain-controlled multistage undrained cyclic triaxial tests were carried out on in-situ saturated marine clay in the Yangtze estuary with different plasticity index Ip. The test results show that both γtp and γtd increase with increasing Ip, and γtp is larger than γtd for the same marine clay tested under the same conditions, with γtp = 0.017 ~ 0.019%, γtd = 0.008 ~ 0.012% for Ip of 17, γtp = 0.033 ~ 0.039%, γtd = 0.020 ~ 0.025% for Ip of 32, and γtp = 0.040 ~ 0.048%, γtd = 0.031 ~ 0.036% for Ip of 40. Moreover, the development of stiffness degradation may not necessarily require the generation of pore water pressure but can be aggravated by it. Furthermore, the γtp and γtd of marine clay are compared with terrestrial soils and marine clays cited from the published literature, the results indicate that the special marine sedimentary environment and the combined action of flow and tidal wave system cause the γtp and γtd of marine clay in the Yangtze estuary to be smaller than that of the terrestrial clays and marine clays in other sea areas. |
| first_indexed | 2024-04-09T14:42:00Z |
| format | Article |
| id | doaj.art-1a9d7829e486414dab0af4b8a785dc4e |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-09T14:42:00Z |
| publishDate | 2023-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-1a9d7829e486414dab0af4b8a785dc4e2023-05-03T05:20:31ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-05-011010.3389/fmars.2023.11842251184225Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuaryXing Xiao0Dong-Wei Ji1Tian-Zhu Hang2Zi-Yang Cai3Lei Zhang4Qi Wu5Qi Wu6Guo-Xing Chen7Guo-Xing Chen8Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu, ChinaInstitute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu, ChinaInstitute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu, ChinaJiangsu Province Institute of Hydrogeological and Engineering Geological Investigation, Huaian, Jiangsu, ChinaSchool of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, ChinaInstitute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu, ChinaCivil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing, Jiangsu, ChinaInstitute of Geotechnical Engineering, Nanjing Tech University, Nanjing, Jiangsu, ChinaCivil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing, Jiangsu, ChinaCyclic threshold shear strain is a fundamental property of saturated soils under cyclic loading. To investigate the cyclic threshold shear strain for pore water pressure generation (γtp) and stiffness degradation (γtd), a series of strain-controlled multistage undrained cyclic triaxial tests were carried out on in-situ saturated marine clay in the Yangtze estuary with different plasticity index Ip. The test results show that both γtp and γtd increase with increasing Ip, and γtp is larger than γtd for the same marine clay tested under the same conditions, with γtp = 0.017 ~ 0.019%, γtd = 0.008 ~ 0.012% for Ip of 17, γtp = 0.033 ~ 0.039%, γtd = 0.020 ~ 0.025% for Ip of 32, and γtp = 0.040 ~ 0.048%, γtd = 0.031 ~ 0.036% for Ip of 40. Moreover, the development of stiffness degradation may not necessarily require the generation of pore water pressure but can be aggravated by it. Furthermore, the γtp and γtd of marine clay are compared with terrestrial soils and marine clays cited from the published literature, the results indicate that the special marine sedimentary environment and the combined action of flow and tidal wave system cause the γtp and γtd of marine clay in the Yangtze estuary to be smaller than that of the terrestrial clays and marine clays in other sea areas.https://www.frontiersin.org/articles/10.3389/fmars.2023.1184225/fullmarine claycyclic threshold shear strainpore water pressure generationstiffness degradationcyclic triaxial tests |
| spellingShingle | Xing Xiao Dong-Wei Ji Tian-Zhu Hang Zi-Yang Cai Lei Zhang Qi Wu Qi Wu Guo-Xing Chen Guo-Xing Chen Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary Frontiers in Marine Science marine clay cyclic threshold shear strain pore water pressure generation stiffness degradation cyclic triaxial tests |
| title | Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary |
| title_full | Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary |
| title_fullStr | Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary |
| title_full_unstemmed | Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary |
| title_short | Cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at Yangtze estuary |
| title_sort | cyclic threshold shear strain for pore water pressure generation and stiffness degradation in marine clays at yangtze estuary |
| topic | marine clay cyclic threshold shear strain pore water pressure generation stiffness degradation cyclic triaxial tests |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1184225/full |
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