U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Modifications for the Smooth Joint Contact Model in the Particle Flow Code



Details

  • Personal Author:
  • Description:
    This paper deals with the following two shortcomings of the smooth joint contact model (SJCM) used in the particle flow code (PFC): (a) Use of a constant value for joint normal stiffness instead of allowing actual non-linear behavior between the joint normal deformation and joint normal stress; (b) The so called "interlocking problem". The first one is solved by imposing a linear relation between the joint normal stiffness and the normal contact stress in a new modified smooth-joint contact model (MSJCM). A good agreement obtained between the results from the experimental tests and the numerical modeling of the compression joint normal test, shows the accuracy of this new model. The second shortcoming occurs due to a lack of an updating procedure in the PFC software related to the contact conditions of the particles that lie around the intended joint plane during high shear displacements. This problem increases the shear strength of the joint when the shear displacement of the joint exceeds a specific value and creates unwanted fractures around the intended joint plane. To solve this problem a new approach termed joint side checking (JSC) is proposed. Numerical modeling of the direct shear test shows JSC can solve the interlocking problem and proves to be more consistent with the theory compared to the regular approach. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Publisher:
    American Rock Mechanics Association (ARMA)
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • NIOSHTIC Number:
    nn:20068900
  • Citation:
    51st US Rock Mechanics/Geomechanics Symposium, June 25-28, 2017, San Francisco, California. Alexandria, VA: American Rock Mechanics Association (ARMA), 2017 Jun; :ARMA 17-845
  • Federal Fiscal Year:
    2017
  • Performing Organization:
    University of Arizona
  • Peer Reviewed:
    False
  • Start Date:
    20110901
  • Source Full Name:
    51st US Rock Mechanics/Geomechanics Symposium, June 25-28, 2017, San Francisco, California
  • End Date:
    20160831
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:b24870a78ef0ec7a89aad98e3c6dbce871054427e800c0d1ddc838ba81ab0e76811cd245349f34b3f1fbb4b315342dfe6232e72201a796c407fcdf8eb142991c
  • Download URL:
  • File Type:
    Filetype[PDF - 2.37 MB ]
PREVIOUS
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP