ORCID

Bertrand Galy : 0000-0002-2001-9580

Type de document

Articles dans des actes de congrès

Année

2025

Langue

Anglais

Titre des actes

IOP Conference Series: Earth and Environmental Science

Maison d’édition

IOP Publishing Ltd

Résumé

This study focuses on the modelling of the complex behaviour of Champlain Sea deposits of Éastern Canada. Sensitive clays present unique geotechnical challenges due to their significant strength loss upon remolding and complex stress-strain response. The research was conducted in two phases: (1) a laboratory investigation of Louiseville clay under various stress paths and (2) the development and validation of a modified constitutive model based on the Hardening Soil model with small-strain stiffness (HSsmall). Standard HSsmall showed limitations in representing the behaviour of structured sensitive clays, especially in the overconsolidated range. To address this, the HSSstruct model, which improves upon HSsmall by eliminating pre-failure shear hardening, was developed. Validation against laboratory tests showed excellent agreement, with an average deviation of ±2 kPa in undrained shear strength predictions, along with accurate pore pressure response and strain at failure under various stress paths. The model effectively captured the quasi-elastic behaviour of structured sensitive clays before peak strength and outperformed the traditional Mohr-Coulomb model. Despite the need for further refinements for cyclic loading and post-peak softening, this represents the first dedicated constitutive model for Éastern Canadian sensitive clays. Its integration into Plaxis enables advanced elasto-plastic modelling, improving the reliability of geotechnical design in sensitive clay regions.

Mots-clés

Soil, Ground, Argile, Clay, CAS 1302870, Excavation et tranchée, Trenching and excavating

Numéro de projet IRSST

0099-5290

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