The Influence of Heterogeneity of Block Contact Input Parameters on Model Behavior for Bonded Block Models of Laboratory Rock Specimens

Details

• Personal Author:
  Walton G ; West I
• Description:
  Bonded Block Models (BBMs) have become increasingly used to simulate laboratory rock samples in Unconfined Compressive Strength (UCS) and Triaxial tests. BBMs require input parameters that describe the deformation of the blocks themselves (block properties), as well as the interaction of the blocks with adjacent blocks (contact properties). For rocks with more than one mineral (i.e. block) type, there exists more than one type of contact between blocks, each of which requires a different set of input parameters. Little is known about the effect of heterogeneity of the contact properties on individual aspects of the overall behavior of the BBM. Therefore, this study has conducted a sensitivity analysis on the heterogeneity of contact input parameters. Contact input parameters were tested separately by varying the degree of heterogeneity between contact types, while keeping the weighted average of each given contact property constant for all simulations. Both a UCS and a Triaxial test with 12 MPa of confining pressure were simulated for each case to evaluate the effects of heterogeneity under unconfined and confined conditions. Rock specimen properties were computed from the model results including Young's Modulus, Poisson's Ratio, UCS and Peak Strengths, and Crack Initiation (CI) and Crack Damage (CD) parameters. While several minor influences of heterogeneity on macroscopic properties were noted, the primary influence was that of contact peak cohesion heterogeneity on CD under both unconfined and confined conditions. [Description provided by NIOSH]
• Subjects:
  Geology Laboratories Occupational Health Safety
• Keywords:
  Geotechnical Engineering Laboratory Testing Models Rock Mechanics Simulation Methods
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• NIOSHTIC Number:
  nn:20067975
• Citation:
  55th US Rock Mechanics/Geomechanics Symposium, June 18-25, 2021, Houston, Texas, virtual event. Alexandria, VA: American Rock Mechanics Association (ARMA), 2021 Jun; :ARMA-2021-1250
• Federal Fiscal Year:
  2021
• Performing Organization:
  Colorado School of Mines, Golden
• Peer Reviewed:
  False
• Start Date:
  20160915
• Source Full Name:
  55th US Rock Mechanics/Geomechanics Symposium, June 18-25, 2021, Houston, Texas, virtual event
• End Date:
  20210914
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c7e097faccbc5e607b535f16452c65bdcb9b4a9a3e4b4952aa5d3e8a495bbf5f78bfddd7a5abc2b066ce598c66bf2170118636fbfb417b05cba3e9a3e1c8fa27
• Download URL:
  https://stacks.cdc.gov/view/cdc/230207/cdc_230207_DS1.pdf
• File Type:
  [PDF - 957.88 KB ]