Influence of Mineralogical Compositions on Anisotropic Burst-Prone Coal Strength

Details

• Personal Author:
  Kim BH ; Larson, Mark K. ; Lawson HE ; Walton G
• Description:
  This paper was developed as part of an effort by the National Institute for Occupational Safety and Health (NIOSH) to identify risk factors associated with bursts/bumps in the prevention of fatalities and accidents in highly stressed, burst- (or bump-) prone ground conditions. This study focused on a geochemical aspect that contributes to coal bumps. In this study, we evaluated the effects of different shapes and distribution densities of mineral grains in coal on failure mechanics using the numerical software 3DEC. The main aim of this study was to identify possible failure mechanisms influenced by mineral habit and frequency in coal. Exploring differences in failure mechanics associated with the mineral grains helped to determine the role of mineral character as a possible contributor to characterize burst-prone coals. To achieve the goal of this study, a series of numerical specimens were prepared in the 3DEC model as follows: first, the 3DEC modeling in conjunction with the DFNs (Discrete Fracture Networks) technique was performed to explicitly generate the discontinuities (i.e., cleats and bedding planes) in the numerical specimens based on the results of laboratory analyses. Then, the different realizations of mineral grains were embedded in the 3DEC model to simulate an unconfined compressive strength (UCS) test to assess the influence of the mineralogical characteristics on the UCS. As a result, although the UCS of the coal was highly anisotropic depending on the orientations of the cleats, the shapes and distribution densities of mineral grains in the coal affected not only the strength but also the failure mechanism of the coal. [Description provided by NIOSH]
• Subjects:
  Accidents, Occupational Coal Coal Mining Minerals Mining Mortality Occupational Health Preventive Medicine Safety
• Keywords:
  Accidents Anisotropy Coal Mining Fatalities Geochemistry Ground Stability Models Preventive Measures
• Series:
  Mining Publications
• ISBN:
  9781713863700
• Publisher:
  Society for Mining, Metallurgy & Exploration (SME)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 10 ; OSHA Region 8 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SMRD - Spokane Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  94-108
• NIOSHTIC Number:
  nn:20067491
• Citation:
  Proceedings of the 41st International Conference on Ground Control in Mining (ICGCM 2022), July 26-28, 2022, Canonsburg, Pennsylvania. Englewood, CO: Society for Mining, Metallurgy & Exploration (SME), 2022 Jul; :94-108
• Contact Point Address:
  Bo Hyun Kim, Miner Safety Branch, Spokane Mining Research Division, CDC/NIOSH, 315 E Montgomery Avenue, Spokane, WA
• Email:
  Bkim2@cdc.gov
• Federal Fiscal Year:
  2022
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 41st International Conference on Ground Control in Mining (ICGCM 2022), July 26-28, 2022, Canonsburg, Pennsylvania
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5a31654d5d70fa7127daabaa7857951724a3bcd36e7e0eae23f7daae33e936284c497f60417b862625fcf074664133e0c3a46bf6f1378c102afed68d74df57db
• Download URL:
  https://stacks.cdc.gov/view/cdc/215546/cdc_215546_DS1.pdf
• File Type:
  [PDF - 3.65 MB ]