Fracture initiation in cavity expansion of rock

Ali Tarokh, Derrick J. Blanksma, Ali Fakhimi, Joseph F. Labuz

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Initiation of fracture from a cylindrical opening in blocks of Berea sandstone under plane strain was monitored with a cavity expansion apparatus. Using the particle tracking technique called digital image correlation, a discontinuity in the displacement field near the cavity boundary was identified at 80% of the peak internal pressure, which meant that a process zone developed prior to peak. To investigate the effect of scaling on fracture, a two dimensional bonded particle model was validated, and several specimens sizes with different borehole and tension softening characteristics were tested numerically. It is demonstrated that with increase in specimen size or with increase in borehole size, the peak pressure decreases, and these size effects are governed by both material and structural length scales.

Original languageEnglish (US)
Pages (from-to)84-91
Number of pages8
JournalInternational Journal of Rock Mechanics and Mining Sciences
Volume85
DOIs
StatePublished - May 1 2016

Keywords

  • Digital image correlation (DIC)
  • Discrete element method (DEM)
  • Material and structural length scales
  • Peak pressure
  • Size effect

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