Cavity expansion of rock and effect of stress state

Feitao Zeng, Ali Tarokh, Longtan Shao, Joseph F. Labuz

Research output: Contribution to conferencePaperpeer-review

Abstract

Cavity expansion tests were simulated using the discrete element method (DEM), where a two-dimensional bonded particle model was validated to investigate the initiation of tensile fracture and breakdown (peak) pressure. The effect of far-field stress, as well as borehole size, on cavity expansion of rock was studied; specimens with three different sizes under various levels of far-field stresses were tested numerically. It is evident that an increase in borehole size results in a lower breakdown pressure. Furthermore, it is illustrated that the breakdown pressure increases with the decrease of the deviatoric component of the stress state, regardless of specimen size. As the far-field stress approaches the hydrostatic condition, the size effect on breakdown pressure reduces. The stress state affects the brittleness of the system, modifying the transition between strength-driven and energy-driven failure.

Original languageEnglish (US)
Pages773-783
Number of pages11
StatePublished - 2017
Event15th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2017 - Wuhan, China
Duration: Oct 19 2017Oct 23 2017

Conference

Conference15th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2017
CountryChina
CityWuhan
Period10/19/1710/23/17

Bibliographical note

Funding Information:
This research was partially funded by the China Scholarship Council (CSC) and the MSES/Miles Kersten Chair. Professor Ali Fakhimi from New Mexico Institute of Mining and Technology allowed access to his CA2 program.

Publisher Copyright:
© 2017 15th International Conference of the International Association for Computer Methods and Advances in Geomechanics

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Bonded-particle model
  • Breakdown pressure
  • Cavity expansion
  • Far-field stress

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