Effects of Structure and Strain Localization in Pfem Simulations of Cptu Tests in a Natural Clay

Kateryna Oliynyk, Matteo Ciantia, Claudio Tamagnini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

The mechanics of cone penetration in CPTu tests in a silty clay was investigated with the PFEM, using a recently proposed finite deformation plasticity model for natural geomaterials – the FD MILAN model – which incorporates the bond strength Pt as an internal variable quantifying the effects of structure, and is equipped with a characteristic length ℓc to regularize the numerical solutions in presence of strain localization. The results of the PFEM simulations show that the deformations around the piezocone are strongly affected by the characteristic length. In particular, when ℓc/R is sufficiently small, the deformation field may be affected by clearly visible shear bands. The soil around the piezocone is subjected to a very strong destructuration process, which leads to the complete loss of bond strength in a large region around the cone tip and shaft. As a consequence, the use of literature empirical correlations in the interpretation of the CPTu test data in heavily structured soils could result in a significant underestimation of both the undrained strength and the overconsolidation ratio of the soil deposit.
Original languageEnglish
Title of host publicationProceedings of the 2024 UK Association for Computational Mechanics Conference
Subtitle of host publicationDurham, UK, 10-12 April 2024.
EditorsWilliam M. Coombs
PublisherDurham University
Pages145-158
Number of pages4
Publication statusPublished - 10 Apr 2024
EventAnnual Conference of the UK Association for Computational Mechanics. - Durham University, Durham, United Kingdom
Duration: 10 Apr 202413 May 2024
https://sites.google.com/view/ukacm2024conference

Conference

ConferenceAnnual Conference of the UK Association for Computational Mechanics.
Country/TerritoryUnited Kingdom
CityDurham
Period10/04/2413/05/24
Internet address

Keywords

  • CPTu tests
  • Natural clay soils
  • Strain localization
  • Nonlocal plasticity
  • PFEM

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