Elastic and inelastic deformation of fluid-saturated rock

Roman Y. Makhnenko, Joseph F. Labuz

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

In situ rock is often saturated with fluid, the presence of which affects both elastic parameters and inelastic deformation processes. Techniques were developed for testing fluid-saturated porous rock under the limiting conditions of drained (longterm), undrained (short-term) and unjacketed (solid matrix) response in hydrostatic, axisymmetric and plane-strain compression. Drained and undrained poroelastic parameters, including bulk modulus, Biot and Skempton coefficients, of Berea sandstone were found to be stress dependent up to 35MPa mean stress, and approximately constant at higher levels of loading. The unjacketed bulk modulus was measured to be constant for pressure up to 60 MPa, and it appears to be larger than the unjacketed pore bulk modulus. An elasto-plastic constitutive model calibrated with parameters from drained tests provided a first-order approximation of undrained inelastic deformation: Dilatant hardening was observed due to pore pressure decrease during inelastic deformation of rock specimens with constant fluid content. This article is part of the themed issue 'Energy and the subsurface'.

Original languageEnglish (US)
Article number20150422
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume374
Issue number2078
DOIs
StatePublished - Oct 13 2016

Keywords

  • Dilatant hardening
  • Drained and undrained response
  • Plane-strain compression
  • Poroelasticity
  • Unjacketed bulk moduli

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