An explicit stabilised material point method for coupled hydromechanical problems in two-phase porous media

Xiangcou Zheng, Federico Pisanò, Philip J. Vardon, Michael A. Hicks*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

34 Citations (Scopus)
126 Downloads (Pure)

Abstract

This paper presents a single-point Material Point Method (MPM) for large deformation problems in two-phase porous media such as soils. Many MPM formulations are known to produce numerical oscillations and inaccuracies in the simulated results, largely due to numerical integration and stress recovery performed at non-ideal locations, cell crossing errors, and mass moving from one background grid cell to another. The same drawbacks lead to even worse consequences in the presence of an interstitial fluid phase, especially when undrained/incompressible conditions are approached. In this study, an explicit stabilised MPM, based on the Generalised Interpolation Material Point (GIMP) method with Selective Reduced Integration (SRI), is proposed to mitigate typical numerical oscillations in (nearly) incompressible coupled problems. It includes two additional features to improve stress and pore pressure recovery, namely (i) patch recovery of pore pressure increments based on a Moving Least Squares Approximation, and (ii) two-phase extension of the Composite Material Point Method for effective stress recovery. The combination of components leads to a new method named GC-SRI-patch. After a detailed description of the approach, its effectiveness is verified through analysing various consolidation problems, with emphasis on the representation of pore pressures in time and space.

Original languageEnglish
Article number104112
Pages (from-to)1-16
Number of pages16
JournalComputers and Geotechnics
Volume135
DOIs
Publication statusPublished - 2021

Keywords

  • Hydromechanical coupling
  • Large deformations
  • Material point method
  • Patch recovery
  • Pore pressure stabilisation
  • Porous media

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