A stable mesh-independent approach for numerical modelling of structured soils at large strains

Lluís Monforte (Lead / Corresponding author), Matteo O. Ciantia, Josep Maria Carbonell, Marcos Arroyo, Antonio Gens

Research output: Contribution to journalArticle

Abstract

We describe the large strain implementation of an elasto-plastic model for structured soils into G-PFEM, a code developed for geotechnical simulations using the Particle Finite Element Method. The constitutive model is appropriate for naturally structured clays, cement-improved soils and soft rocks. Structure may result in brittle behavior even in contractive paths; as a result, localized failure modes are expected in most applications. To avoid the pathological mesh-dependence that may accompany strain localization, a nonlocal reformulation of the model is employed. The resulting constitutive model is incorporated into a numerical code by means of a local explicit stress integration technique. To ensure computability this is hosted within a more general Implicit-Explicit integration scheme (IMPLEX). The good performance of these techniques is illustrated by means of element tests and boundary value problems.
Original languageEnglish
Article number103215
Pages (from-to)1-13
Number of pages13
JournalComputers and Geotechnics
Volume116
Early online date30 Aug 2019
DOIs
Publication statusPublished - Dec 2019

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Keywords

  • PFEM
  • structured soils
  • nonlocal elasto-plasticity
  • constitutive modeling

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