On crack propagation in weak geomaterials: Revisiting the superdislocation model in the context of hydraulic fracture

M. Wrobel*, M. Dutko, G. Mishuris, P. Papanastasiou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
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Abstract

In this paper the problem of hydraulic fracture in elasto-plastic pressure sensitive material is analyzed. The superdislocation model is used to approximate the plastic deformations in the crack tip area. This model is employed to derive a new crack propagation condition based on the concept of effective fracture toughness. A parametric analysis supported by FEM simulations is conducted to verify the underlying assumptions of the superdislocation model and the resulting crack propagation condition. The results, obtained with the new crack propagation condition for the HF problem, are compared with those produced by a commercial geomechanical FEM package Elfen. The comparison proves the validity of the new crack propagation condition and the proposed modeling approach.

Original languageEnglish
Article number103878
Number of pages25
JournalInternational Journal of Engineering Science
Volume191
Early online date09 Jun 2023
DOIs
Publication statusPublished - 01 Oct 2023

Keywords

  • Hydraulic fracture
  • Mohr–Coulomb model
  • Plane strain crack
  • Plastic deformation
  • Superdislocation

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