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Quantitative Evaluation of the Effects of Input Parameter Heterogeneity on Model Behavior for Bonded Block Models of Laboratory Rock Specimens



Details

  • Personal Author:
  • Description:
    Bonded block models (BBMs) have become increasingly common for simulation of laboratory-scale rock samples in unconfined compressive strength and triaxial compression tests. BBMs require input parameters that describe the deformation of the blocks themselves (block properties), as well as the interactions between blocks (contact properties). Previous studies have found that incorporating heterogeneity of input parameters into BBMs is necessary to match all attributes of rock behavior, but little is known about the specific effects that the heterogeneity of these properties have on individual aspects of the overall behavior of the BBM. Therefore, this study presents a parametric study on the heterogeneity of elastic block and contact input parameters. Such input parameters were tested separately by varying the degree of heterogeneity between block or contact types, while keeping the weighted average of each given property constant for all simulations. Trends were analyzed for simulations under unconfined and confined conditions with 12 MPa of pressure. Rock specimen properties were computed from the model results including Young's modulus, Poisson's ratio, unconfined compressive strength and peak strength, crack initiation (CI) and crack damage (CD) parameters, and peak dilation angle. While several minor influences of heterogeneity on macroscopic properties were noted, the primary influence was that of contact peak cohesion heterogeneity on CD. Additionally, while the heterogeneity of no individual parameter was found to influence CI, when degrees of heterogeneity for all parameters were varied simultaneously, this had a significant effect on CI (as well as CD). [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0723-2632
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    56
  • Issue:
    10
  • NIOSHTIC Number:
    nn:20067742
  • Citation:
    Rock Mech Rock Eng 2023 Oct; 56(10):7129-7146
  • Contact Point Address:
    Isabella West, Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, USA
  • Email:
    igwest@mines.edu
  • Federal Fiscal Year:
    2024
  • Performing Organization:
    Colorado School of Mines, Golden
  • Peer Reviewed:
    True
  • Start Date:
    20160915
  • Source Full Name:
    Rock Mechanics and Rock Engineering
  • End Date:
    20210914
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:eeb3c8396b824856a5cb943baa89c483cd751a2ff6c40637c99dfc097d799ab1b08f01efb50a8afecad26fb39e2e73eb369e1937b2264482de2b44bb0d1b4bf2
  • Download URL:
  • File Type:
    Filetype[PDF - 2.29 MB ]
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