Geomechanics and Engineering

  • 제34권3호
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  • Pages.317-328
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  • 2023
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Modelling the critical state behaviour of granular soils: Application of NorSand constitutive law to TP-Lisbon sand

  • 투고 : 2022.08.02
  • 심사 : 2023.07.06
  • 발행 : 2023.08.10
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

This work was financially supported by UIDB/04708/2020 and UIDP/04708/2020 of CONSTRUCT - Institute of R&D in Structures and Construction, Portugal funded by the national funds through the FCT/MCTES (PIDDAC). The second and fourth authors acknowledge the Portuguese Foundation for Science and Technology (FCT) for the support of the grants SFRH/BD/146265/2019 and SFRH/BD/143817/2019, respectively. Acknowledgements are especially due to Dr Cristina Raminhos from 'Metropolitano de Lisboa, E.P.E.' for providing the samples of TP-Lisbon sand. The authors also cknowledge the technical support given by Eng. Daniela Coelho and Mr. Armando Pinto of LabGeo during the development of the experimental program.

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