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Geomechanics and Engineering Volume 34, Number 3, August 102023 , pages 317-328 DOI: https://doi.org/10.12989/gae.2023.34.3.317 |
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Modelling the critical state behaviour of granular soils: Application of NorSand constitutive law to TP-Lisbon sand |
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António Viana da Fonseca, Fausto Molina-Gómez, Cristiana Ferreira and Julieth Quintero
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| Abstract | ||
| The soil behaviour can be represented by numerical modelling of element testing using diverse constitutive models. However, not all constitutive models allow the simulation of the stress-strain response at the critical state in granular soils with both contractive and dilative behaviour. Moreover, the accuracy of these models depends highly on the quality of the experimental data used for their calibration. This study addresses the modelling of the critical state behaviour of an alluvial natural soil from the Lower Tagus Valley (south of Portugal), known as TP-Lisbon sand, using the NorSand constitutive law. For this purpose, a series of numerical simulations of element testing was carried out using two algorithms performed in Visual Basic (VB) and Fast Lagrangian Analysis of Continua (FLAC). Moreover, this study presents the characterisation of of NorSand parameters from an accurate experimental programme based on triaxial and bender element testing. This experimental program allowed defining: (i) the critical state locus, (ii) the stress-dilatancy, and (iii) the soil elasticity of TP-Lisbon sand —all fundamental to calibrate the contractive and dilative behaviour of such alluvial soil. The results revealed a good agreement between experimental data and NorSand simulations using VB and FLAC. Therefore, this study showed that the quality of laboratory testing procedures and its good interpretation enables NorSand constitutive law to capture representatively the non-associated plastic strains, often expressed by the state parameter, allowing a representation of soil behaviour of alluvial soils within the critical state soil mechanics framework for different state parameters. | ||
| Key Words | ||
| critical state soil mechanics; numerical modelling; laboratory tests; sands | ||
| Address | ||
| António Viana da Fonsecaa, Fausto Molina-Gómez, Cristiana Ferreirab and Julieth Quintero: CONSTRUCT-GEO, Faculty of Engineering (FEUP), Universidade do Porto, Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal | ||