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

Fingerprint

Constitutive models
Soil cement
Soils
Failure modes
Boundary value problems
modeling
Clay
soil
Rocks
Plastics
Finite element method
soft rock
finite element method
cement
plastic
clay
simulation
code

Keywords

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

Cite this

Monforte, Lluís ; Ciantia, Matteo O. ; Carbonell, Josep Maria ; Arroyo, Marcos ; Gens, Antonio. / A stable mesh-independent approach for numerical modelling of structured soils at large strains. In: Computers and Geotechnics. 2019 ; Vol. 116. pp. 1-13.
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A stable mesh-independent approach for numerical modelling of structured soils at large strains. / Monforte, Lluís (Lead / Corresponding author); Ciantia, Matteo O.; Carbonell, Josep Maria; Arroyo, Marcos; Gens, Antonio.

In: Computers and Geotechnics, Vol. 116, 103215, 12.2019, p. 1-13.

Research output: Contribution to journalArticle

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T1 - A stable mesh-independent approach for numerical modelling of structured soils at large strains

AU - Monforte, Lluís

AU - Ciantia, Matteo O.

AU - Carbonell, Josep Maria

AU - Arroyo, Marcos

AU - Gens, Antonio

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AB - 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.

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KW - nonlocal elasto-plasticity

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