Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness
Comprehensive investigations have been conducted to study the structure and overconsolidation of upper Shanghai clays, i.e. Layers 2–6 clays, typically located at depths of 30–40 m. However, limited information is available on their anisotropy, and even less is known about the correlation between st...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-01-01
|
| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775524002348 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841526316352929792 |
|---|---|
| author | Lixin Lan Wenxuan Zhu Guanlin Ye Qi Zhang Tongshuai Yang |
| author_facet | Lixin Lan Wenxuan Zhu Guanlin Ye Qi Zhang Tongshuai Yang |
| author_sort | Lixin Lan |
| collection | DOAJ |
| description | Comprehensive investigations have been conducted to study the structure and overconsolidation of upper Shanghai clays, i.e. Layers 2–6 clays, typically located at depths of 30–40 m. However, limited information is available on their anisotropy, and even less is known about the correlation between structure, overconsolidation, and anisotropy. In this study, the undrained anisotropy characteristics of shear strength and small-strain shear stiffness in upper Shanghai Layers 2–6 clays were thoroughly assessed using a series of K0-consolidated undrained triaxial compression (TC) and triaxial extension (TE) tests (K0 is the coefficient of lateral earth pressure at rest). The effective stress paths, shear strength, and small-strain shear stiffness from the undrained TC and TE tests demonstrate the anisotropic behaviors in upper Shanghai clays. Analyses of data from upper Shanghai clays and other clays worldwide indicate that the shear strength anisotropy ratio (Ks) converges at 0.8 as the overconsolidation ratio (OCR) and plasticity index (Ip) increase, while the small-strain shear stiffness anisotropy ratio (Re) converges at 1.0. The influence of OCR on Ks and Re is more pronounced than that of Ip and sensitivity (St). Nevertheless, no clear correlation between Ks and Re is observed in upper Shanghai clays. |
| format | Article |
| id | doaj-art-f90497347944413597abea9f97a7fdaf |
| institution | Kabale University |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-f90497347944413597abea9f97a7fdaf2025-01-17T04:49:09ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-01-01171493508Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffnessLixin Lan0Wenxuan Zhu1Guanlin Ye2Qi Zhang3Tongshuai Yang4Department of Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai, 200240, ChinaDepartment of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, ChinaDepartment of Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai, 200240, China; Corresponding author.Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, ChinaThe Fourth Construction Co., Ltd. of China Construction Eighth Engineering Division, Qingdao, 266100, ChinaComprehensive investigations have been conducted to study the structure and overconsolidation of upper Shanghai clays, i.e. Layers 2–6 clays, typically located at depths of 30–40 m. However, limited information is available on their anisotropy, and even less is known about the correlation between structure, overconsolidation, and anisotropy. In this study, the undrained anisotropy characteristics of shear strength and small-strain shear stiffness in upper Shanghai Layers 2–6 clays were thoroughly assessed using a series of K0-consolidated undrained triaxial compression (TC) and triaxial extension (TE) tests (K0 is the coefficient of lateral earth pressure at rest). The effective stress paths, shear strength, and small-strain shear stiffness from the undrained TC and TE tests demonstrate the anisotropic behaviors in upper Shanghai clays. Analyses of data from upper Shanghai clays and other clays worldwide indicate that the shear strength anisotropy ratio (Ks) converges at 0.8 as the overconsolidation ratio (OCR) and plasticity index (Ip) increase, while the small-strain shear stiffness anisotropy ratio (Re) converges at 1.0. The influence of OCR on Ks and Re is more pronounced than that of Ip and sensitivity (St). Nevertheless, no clear correlation between Ks and Re is observed in upper Shanghai clays.http://www.sciencedirect.com/science/article/pii/S1674775524002348Shanghai claysAnisotropyShear strengthSmall-strain stiffness |
| spellingShingle | Lixin Lan Wenxuan Zhu Guanlin Ye Qi Zhang Tongshuai Yang Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness Journal of Rock Mechanics and Geotechnical Engineering Shanghai clays Anisotropy Shear strength Small-strain stiffness |
| title | Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness |
| title_full | Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness |
| title_fullStr | Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness |
| title_full_unstemmed | Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness |
| title_short | Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness |
| title_sort | anisotropy characterization of upper shanghai clays shear strength and small strain stiffness |
| topic | Shanghai clays Anisotropy Shear strength Small-strain stiffness |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524002348 |
| work_keys_str_mv | AT lixinlan anisotropycharacterizationofuppershanghaiclaysshearstrengthandsmallstrainstiffness AT wenxuanzhu anisotropycharacterizationofuppershanghaiclaysshearstrengthandsmallstrainstiffness AT guanlinye anisotropycharacterizationofuppershanghaiclaysshearstrengthandsmallstrainstiffness AT qizhang anisotropycharacterizationofuppershanghaiclaysshearstrengthandsmallstrainstiffness AT tongshuaiyang anisotropycharacterizationofuppershanghaiclaysshearstrengthandsmallstrainstiffness |