Modeling the effects of static shear on the undrained cyclic torsional simple shear behavior of liquefiable sand (2017)
Spanning from purely theoretical standpoint to practical applications, there is a particular interest to enhance understanding of the effects of static shear on the cyclic behavior of soil elements underneath sloped ground. To address this issue, two subsequent steps were undertaken in this study. First, a systematic laboratory investigation was carried out on Toyoura sand specimens subjected to various levels of combined static and cyclic shear stresses. Then, a new state-dependent cyclic model was developed. Since experimental findings have been exhaustively reported elsewhere, in this paper they are only briefly recalled for the benefit of comprehensiveness. Instead, the new model is presented in details and its performance is verified by simulating undrained cyclic torsional simple shear tests carried out on Toyoura sand specimens. Essentially, the model is built on an extended general stress-strain hyperbolic equation approach, in which the void ratio and stress level dependency upon non-linear stress-strain response of sand is incorporated. Besides, a novel empirical stress-dilatancy relationship is used to account for the effect of density on the stress ratio as well as to model the excess pore water pressure generation in undrained shear conditions as the mirror effect of volumetric change in drained shear conditions.
CitationChiaro G, De Silva LIN, Koseki J (2017). Modeling the effects of static shear on the undrained cyclic torsional simple shear behavior of liquefiable sand. Geotechnical Engineering Journal of the SEAGS & AGSSEA. 48(4).
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KeywordsConstitutive soil model; Laboratory testing; Cyclic torsional simple shear; Static shear; Toyoura sand
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
40 - Engineering::4005 - Civil engineering::400502 - Civil geotechnical engineering
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Chiaro, G.; Kiyota, T.; De Silva, L.I.N.; Sato, T.; Koseki, J. (University of Canterbury. Civil and Natural Resources Engineering, 2010)This paper summarizes the experimental results of a study conducted in order to investigate the effect of initial static shear on the undrained cyclic behavior of saturated sand under cyclic torsional shear loading up ...
Chiaro, G.; Kiyota, T.; De Silva, L.I.N.; Sato, T.; Koseki, J. (University of Canterbury. Civil and Natural Resources Engineering, 2009)To investigate the effect of static shear stress on the undrained cyclic behavior of saturated sand, a series of torsional shear tests was conducted on saturated Toyoura sand specimens up to extremely large strain level ...
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