Discrete element modeling of tool-rock interaction II: rock indentation
Article first published online: 7 AUG 2012
Copyright © 2012 John Wiley & Sons, Ltd.
International Journal for Numerical and Analytical Methods in Geomechanics
Volume 37, Issue 13, pages 1930–1947, September 2013
How to Cite
Huang, H. and Detournay, E. (2013), Discrete element modeling of tool-rock interaction II: rock indentation. Int. J. Numer. Anal. Meth. Geomech., 37: 1930–1947. doi: 10.1002/nag.2114
- Issue published online: 14 AUG 2013
- Article first published online: 7 AUG 2012
- Manuscript Accepted: 15 MAY 2012
- Manuscript Revised: 8 MAY 2012
- National Science Foundation. Grant Number: NSF/CMS-9612035DRK
- discrete element;
- numerical modeling
The failure mechanisms induced by a wedge-shaped tool indenting normally against a rock surface are investigated using the discrete element method (DEM). The main focus of this study is to explore the conditions controlling the transition from a ductile to a brittle mode of failure. The development of a damage zone and the initiation and propagation of a brittle fracture is well captured by the DEM simulations. The numerical results support the conjecture that initiation of brittle fractures is governed by a scaled flaw length Λ, a ratio between the flaw size λ and the characteristic length (where KIc is the toughness and σc the uniaxial compressive strength). The size of the damage zone agrees well with analytical predictions based on the cavity expansion model. The effects of a far-field confining stress and the existence of a relief surface near the indenter are also examined.Copyright © 2012 John Wiley & Sons, Ltd.