Experimental and Numerical Investigation of the Engineering Properties of a Utah Coal Considering the Effect of Anisotropy Due to Cleats

Details

• Personal Author:
  Kim BH ; Larson, Mark K.
• Description:
  The catastrophic failure in coal mines, known as bumps, is one of the most challenging engineering problems associated with coal mining in highly stressed conditions. In this study, coal samples obtained from a Utah coal mine are investigated by conducting laboratory tests. However, the results of the unconfined compressive test do not agree with the strength models of the classical strength formula because the strengths at certain orientations of cleats appear much higher than the estimation by the classical solution. The influence of non-persistent cleats on coal strength is, thus, also investigated using a numerical modeling approach. The 3DEC models are developed to randomly generate cleats with various lengths that follow a given degree of persistence in the numerical model. The 3DEC simulation results successfully replicate the results of the laboratory test for the coal strength with non-persistent cleats. It is concluded from the study that cleat persistence significantly affects the overall anisotropic strength of coal. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Engineering Laboratories Mining Occupational Health Safety
• Keywords:
  3D Anisotropy Coal Mines Coal Mining Compression Tests Compressive Strength Engineering Controls Environmental Engineering Environmental Stress Failure Analysis Geologic Models Geologic Structures Geotechnical Engineering Laboratory Testing Materials Testing Mechanical Properties Models Physical Properties Rock Mechanics Sampling Stress Analysis Structural Analysis Structural Engineering Tensile Strength Three Dimensional Underground Mines

  More +
• Series:
  Mining Publications
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SMRD - Spokane Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• NIOSHTIC Number:
  nn:20053016
• Citation:
  52nd US Rock Mechanics/Geomechanics Symposium, June 17-20, 2018, Seattle, Washington. Alexandria, VA: American Rock Mechanics Association (ARMA), 2018 Jun; :ARMA 18-044
• Contact Point Address:
  B. H. Kim, Spokane Mining Research Division, NIOSH, CDC, 315 E Montgomery Avenue, Spokane WA 99207 USA
• Federal Fiscal Year:
  2018
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  52nd US Rock Mechanics/Geomechanics Symposium, June 17-20, 2018, Seattle, Washington
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9b53ed27956ede56d13e43735a94c3b63035a3f443ee5db9b231d5db7e9355d6695adcd35b31f3bbf751d5f890b97bb9572937d540945048f4f1274985925464
• Download URL:
  https://stacks.cdc.gov/view/cdc/227724/cdc_227724_DS1.pdf
• File Type:
  [PDF - 988.25 KB ]