A modified elasto-plastic model with double yield surfaces and considering particle breakage for the settlement analysis of high rockfill dams
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Author list: Sukkarak R., Pramthawee P., Jongpradist P.
Publisher: Springer
Publication year: 2017
Journal: KSCE Journal of Civil Engineering (1226-7988)
Volume number: 21
Issue number: 3
Start page: 734
End page: 745
Number of pages: 12
ISSN: 1226-7988
eISSN: 1976-3808
Languages: English-Great Britain (EN-GB)
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Abstract
This paper improves the elasto-plastic model with double yield surfaces in the context of the hardening soil model for the simulation of the settlement behavior of high rockfill dams. The stress-dependent stiffness values (E50 and Eoed control the shear hardening and the cap yield surfaces, respectively) are modified to exhibit different degrees of evolution with changes in the stress state. A modification of Rowe’s stress-dilatancy theory is proposed to account for the influence of particle breakage. Good quantitative agreement between simulated and measured stress-strain relationships can be achieved; in particular, the volumetric strain is much improved from the original model. The developed model is applied to predict the settlement of Nam Ngum 2, a 182 m high rockfill dam, during the construction stage, in conjunction with a three-Dimensional (3D) Finite Element (FE) analysis. The findings show that a good agreement between computed settlements and dam field monitoring data can be achieved. © 2017, Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg.
Keywords
double yield surfaces, modified rowe’s stress-dilatancy theory, Particle breakage, stress-dependent stiffness
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