Abstract
In this study, a silty clay of Phu Bai formation which widely distributes along the coastal plains in the central regions of Vietnam, Kaolinite clay and Tohoku clay which was obtained in Japan were used for undrained multi-directional cyclic shear tests with a wide range of shear strain amplitudes (γ). For the two former samples, the unloading-reloading tests were carried out and the coefficient of secondary consolidation in the recompression stage after undrained cyclic shear (εαdyn) was compared with those after unloading (εαR). The effects of cyclic shear on the secondary consolidation were then discussed in connection with the Atterberg’s limits of clays and effects of sample disturbance were also investigated for the undisturbed Tohoku clay. In conclusion, it is clarified that εαdyn generally increases with γ and the soils with higher Atterberg’s limits show larger values of εαdyn and that for Kaolin, as an effect of cyclic shear on the secondary consolidation εαdyn > εαR was observed. Furthermore, for Hue clay, the threshold shear strain amplitude over which such a relation appears was observed as 0.4%.
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Acknowledgments
This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 105.08-2018.01 and also by JSPS KAKENHI Grant Number 16H02362. The experimental works were also supported by the students who graduated Yamaguchi University. The authors would like to express their gratitude to them.
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Matsuda, H., Nhan, T.T., Sato, H., Huong, H.T.S. (2020). Effects of Earthquake on the Secondary Consolidation of Saturated Clay. In: Duc Long, P., Dung, N. (eds) Geotechnics for Sustainable Infrastructure Development. Lecture Notes in Civil Engineering, vol 62. Springer, Singapore. https://doi.org/10.1007/978-981-15-2184-3_185
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DOI: https://doi.org/10.1007/978-981-15-2184-3_185
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