An Anisotropic Clay Plasticity Model for the Cyclic Resistance

Palmieri, Francesca; Taiebat, Mahdi; Dafalias, Yannis F.

doi:10.1007/978-3-030-64514-4_51

Cited by 1 publication

(1 citation statement)

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“…A SANICLAY model with BS, damage, and destructuration was implemented into the OpenSEES program and used for nonlinear site response analysis 28 and multidirectional cyclic shearing 29 . However, with the exception of the work by Palmieri et al., 30,31 which represents a precursor of this work, the currently existing SANICLAY model extensions for cyclic loading, do not account for the presence of a stress and/or strain threshold and, therefore, always predict cyclic stiffness degradation regardless of the applied cyclic shear amplitude. To overcome this limitation, different sets of model parameters for the same material could be used depending on the cyclic shear amplitude.…”

Section: Introductionmentioning

confidence: 99%

An activation mechanism for cyclic degradation of clays in bounding surface plasticity

Palmieri,

Taiebat

2024

Num Anal Meth Geomechanics

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During undrained cyclic loading, clayey soils experience substantial stiffness and strength degradation when subjected to shear amplitudes exceeding a critical threshold. This paper presents an enhanced bounding surface rate‐independent plasticity model, an evolution of the previous SANICLAY model, tailored to capture this specific behavior during cyclic loading. A distinguishing feature of the proposed model is the introduction of an activation mechanism. This mechanism triggers degradation modeling based on the applied cyclic shear amplitude. To measure this amplitude, the activation mechanism incorporates a novel state variable that serves as a proxy for the applied cyclic stress. The effectiveness of the proposed model is demonstrated by comparing it to experimental data from various materials subjected to cyclic shearing under undrained conditions. The study encompasses a broad range of constant strain or stress amplitudes. Compared to the reference model, the proposed model exhibits improved predictive accuracy for the stress‐strain response of clays at small amplitudes of cyclic loading and large number of cycles. Furthermore, it accounts for strength degradation due to cyclic loading.

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Section: Introductionmentioning

confidence: 99%