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Mechanical Behavior of Natural Granite Residual Soil in Simple Shear
https://orcid.org/0000-0002-8165-2259
https://orcid.org/0000-0002-0283-4493
The geotechnical behavior of residual soil differs essentially from that of sedimentary soil because of the weathering pedogenesis of the former, thereby posing significant difficulties in predicting soil response. In this study, the shear strength and stiffness of natural granite residual soil are evaluated through systematic monotonic and cyclic simple shear tests performed using a hollow-cylinder apparatus. Simple shear testing provides critical information about soil behavior under plane-strain conditions and involves principal stress rotation, which is beyond the scope of triaxial shear tests. The mechanical properties of granite residual soil measured in monotonic simple shear are found to be different from those obtained through other routine laboratory tests such as triaxial shear and resonant column tests. Whereas the conventional triaxial compression test gives unconservatively high soil strength parameters, those from simple shear testing appear more reasonable than the triaxial results. The cyclic behavior of residual soil in simple shear is dominated by the cyclic stress ratio, a higher value of which results in more significant deformation and pore water pressure build-up as well as more rapid stiffness degradation. This is particularly the case when the cyclic stress ratio exceeds a critical value in the range of 0.125–0.1875. No consistent pattern can be established for how the loading frequency influences soil responses within the range of 0.01–1.0 Hz. This study enriches the techniques for characterizing residual soil and provides new data sets about its mechanical behavior.
Mechanical Behavior of Natural Granite Residual Soil in Simple Shear
https://orcid.org/0000-0002-8165-2259
https://orcid.org/0000-0002-0283-4493
The geotechnical behavior of residual soil differs essentially from that of sedimentary soil because of the weathering pedogenesis of the former, thereby posing significant difficulties in predicting soil response. In this study, the shear strength and stiffness of natural granite residual soil are evaluated through systematic monotonic and cyclic simple shear tests performed using a hollow-cylinder apparatus. Simple shear testing provides critical information about soil behavior under plane-strain conditions and involves principal stress rotation, which is beyond the scope of triaxial shear tests. The mechanical properties of granite residual soil measured in monotonic simple shear are found to be different from those obtained through other routine laboratory tests such as triaxial shear and resonant column tests. Whereas the conventional triaxial compression test gives unconservatively high soil strength parameters, those from simple shear testing appear more reasonable than the triaxial results. The cyclic behavior of residual soil in simple shear is dominated by the cyclic stress ratio, a higher value of which results in more significant deformation and pore water pressure build-up as well as more rapid stiffness degradation. This is particularly the case when the cyclic stress ratio exceeds a critical value in the range of 0.125–0.1875. No consistent pattern can be established for how the loading frequency influences soil responses within the range of 0.01–1.0 Hz. This study enriches the techniques for characterizing residual soil and provides new data sets about its mechanical behavior.
Mechanical Behavior of Natural Granite Residual Soil in Simple Shear
https://orcid.org/0000-0002-8165-2259
https://orcid.org/0000-0002-0283-4493
The geotechnical behavior of residual soil differs essentially from that of sedimentary soil because of the weathering pedogenesis of the former, thereby posing significant difficulties in predicting soil response. In this study, the shear strength and stiffness of natural granite residual soil are evaluated through systematic monotonic and cyclic simple shear tests performed using a hollow-cylinder apparatus. Simple shear testing provides critical information about soil behavior under plane-strain conditions and involves principal stress rotation, which is beyond the scope of triaxial shear tests. The mechanical properties of granite residual soil measured in monotonic simple shear are found to be different from those obtained through other routine laboratory tests such as triaxial shear and resonant column tests. Whereas the conventional triaxial compression test gives unconservatively high soil strength parameters, those from simple shear testing appear more reasonable than the triaxial results. The cyclic behavior of residual soil in simple shear is dominated by the cyclic stress ratio, a higher value of which results in more significant deformation and pore water pressure build-up as well as more rapid stiffness degradation. This is particularly the case when the cyclic stress ratio exceeds a critical value in the range of 0.125–0.1875. No consistent pattern can be established for how the loading frequency influences soil responses within the range of 0.01–1.0 Hz. This study enriches the techniques for characterizing residual soil and provides new data sets about its mechanical behavior.
Mechanical Behavior of Natural Granite Residual Soil in Simple Shear
J. Geotech. Geoenviron. Eng.
Liu, Xinyu (author) / Miao, Yu (author) / Zhang, Xianwei (author) / Yin, Song (author)
2024-10-01
Article (Journal)
Electronic Resource
English
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