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Modeling Unstable Rock Failure During a Uniaxial Compressive Strength Test



Details

  • Personal Author:
  • Description:
    In this study we investigate unstable compressive failure of rock using numerical modeling. An unconfined compression test with variable platen stiffness is modeled using three different finite difference based numerical models: a continuum model (FLAC3D), a distinct element model comprised of blocks with interfacing joints (3DEC), and a distinct element model comprised of bonded spheres (PFC3D). In each case we show that unstable failure can be modeled according to the theory that instability occurs when potential energy stored within a relatively soft loading system is quickly transferred to the loaded rock as it fails, rescinding its ability to withstand load. Instability is detected in each model when a period of rapid platen rebound causes a sudden reduction of strength in the sample. Whereas during stable failure, the post-peak modulus of the failing specimen is observed to follow the unloading curve of the characterisitc material in a stable softening mode. Each model type reproduces similar behavior in both stable and unstable failure. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISBN:
    9781618391544
  • Publisher:
    American Rock Mechanics Association (ARMA)
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-9
  • NIOSHTIC Number:
    nn:20056900
  • Citation:
    45th US Rock Mechanics/Geomechanics Symposium, June 26-29, 2011, San Francisco, California. Alexandria, VA: American Rock Mechanics Association (ARMA), paper no. 11-442, 2011 Jun; :1-9
  • Federal Fiscal Year:
    2011
  • NORA Priority Area:
    Mining
  • Performing Organization:
    Colorado School of Mines, Golden, Colorado
  • Peer Reviewed:
    False
  • Start Date:
    20090901
  • Source Full Name:
    45th US Rock Mechanics/Geomechanics Symposium, June 26-29, 2011, San Francisco, California
  • End Date:
    20130831
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:8691bfd77e0d128c1ac125dc763bba4c991631862777227c40cbcd0357b316380fece7647b68d6969e8d9a3ce60fde55c785c64a39de8574590670fb6e681d6c
  • Download URL:
  • File Type:
    Filetype[PDF - 674.88 KB ]
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