A theoretical investigation of a mechanical response of fluid-saturated porous materials based on a coupled discrete-continuum approach

Andrey V. Dimaki, Evgeny V. Shilko, Sergei V. Astafurov, Sergei G. Psakhie

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

Abstract

We propose a numerical model of liquid-saturated porous material, based on a coupled approach combining a discrete elements method and finite difference method. An ensemble of discrete elements simulates processes of deformation of a porous solid and filtration of single-phase liquid in an interconnected network of "micropores". Mass transfer of a fluid between the "micropores" and "macropores" (the latter are considered as the areas between spatially separated and non-interacting discrete elements) is calculated on a finer grid superimposed on an ensemble of movable discrete elements. The developed model was applied to study a mechanical response of brittle samples with water-saturated pore volume. It has been shown that the strength of liquid-saturated samples is determined not only by strength properties of "dry" material and a pore pressure, but largely by sample geometry, deformation rate and characteristics of porosity of a material. We suggest a generalizing dependence of the uniaxial compressive strength of water-saturated permeable brittle material on the specific diameter of filtration channels, which is the ratio of the characteristic diameter of the filtration channels to the square root of the strain rate. Values of parameters of mentioned dependence are strongly connected with the character of the relation between pore volume and pressure of a liquid.

Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015
PublisherInternational Center for Numerical Methods in Engineering
Pages442-450
Number of pages9
ISBN (Print)9788494424472
Publication statusPublished - 2015
Event4th International Conference on Particle-Based Methods, PARTICLES 2015 - Barcelona, Spain
Duration: 28 Sep 201530 Sep 2015

Other

Other4th International Conference on Particle-Based Methods, PARTICLES 2015
CountrySpain
CityBarcelona
Period28.9.1530.9.15

Keywords

  • Discrete elements
  • Finite difference
  • Liquid
  • Porous media

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Dimaki, A. V., Shilko, E. V., Astafurov, S. V., & Psakhie, S. G. (2015). A theoretical investigation of a mechanical response of fluid-saturated porous materials based on a coupled discrete-continuum approach. In Proceedings of the 4th International Conference on Particle-Based Methods - Fundamentals and Applications, PARTICLES 2015 (pp. 442-450). International Center for Numerical Methods in Engineering.