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Effect of Damping Mode in Laboratory and Field-Scale Universal Distinct Element Code (UDEC) Models



Details

  • Personal Author:
  • Description:
    In practical rock engineering, Universal Distinct Element Code (UDEC) is one of the most widely used two-dimensional software packages for simulating discontinuum behaviors of rocks and rockmasses. Over the years, this software has been used to study phenomena, such as grain-scale fracturing in laboratory specimens, spalling around tunnels and roadways, shearing and separation along discontinuities in jointed rockmasses, etc. One of the lesser discussed topics in context of explicit time-stepping discontinuum modeling in UDEC is the damping mode employed for such simulations. For static analysis, the 'local' (default) and 'combined' damping modes are generally used, but their effects on the emergent model response as well as their suitability to a particular problem are not well documented in the literature. To help bridge this gap, this study contrasts the responses of a laboratory-scale model, a hypothetical granite pillar model and a hypothetical coal mine entry model with 'Local' and 'Combined' damping modes. It was found that in small-scale simulations, the results using 'Local' and 'Combined' damping modes were similar, but the differences were significant in the field-scale models. In particular, 'Local' damping mode tended to suppress large deformations, predicted high pillar strengths and increased model run-time significantly. Although it is difficult to definitively establish which of the two damping mode leads to more realistic excavation-scale behavior in a given scenario, the authors suggest the use of 'Combined' damping for models of individual excavations where large deformations and block separations are expected. [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:
    55
  • Issue:
    5
  • NIOSHTIC Number:
    nn:20066335
  • Citation:
    Rock Mech Rock Eng 2022 May; 55(5):2899-2915
  • Contact Point Address:
    Sankhaneel Sinha, Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO, USA
  • Email:
    sankhaneelsinha@mymail.mines.edu
  • Federal Fiscal Year:
    2022
  • 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-512:0c50b9fc356db78272ba717d1492d4944d5c85a1d32bbf25e34b68fc9ce38388a714eda6ade2606626aa921abe76764e81da7a4aa684c9b464b779881cfd5160
  • Download URL:
  • File Type:
    Filetype[PDF - 3.06 MB ]
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