Rapid Decompression and Desorption Induced Energetic Failure in Coal

Details

• Personal Author:
  Elsworth D ; Liu J ; Wang S
• Description:
  In this study, laboratory experiments are conducted to investigate the rapid decompression and desorption induced energetic failure in coal using a shock tube apparatus. Coal specimens are recovered from Colorado at a depth of 610 m. The coal specimens are saturated with the strong sorbing gas CO2 for a certain period and then the rupture disc is suddenly broken on top of the shock tube to generate a shock wave propagating upwards and a rarefaction wave propagating downwards through the specimen. This rapid decompression and desorption has the potential to cause energetic fragmentation in coal. Three types of behaviors in coal after rapid decompression are found, i.e. degassing without fragmentation, horizontal fragmentation, and vertical fragmentation. We speculate that the characteristics of fracture network (e.g. aperture, spacing, orientation and stiffness) and gas desorption play a role in this dynamic event as coal can be considered as a dual porosity, dual permeability, dual stiffness sorbing medium. This study has important implications in understanding energetic failure process in underground coal mines such as coal gas outbursts. [Description provided by NIOSH]
• Subjects:
  Coal Mining Occupational Health Safety
• Keywords:
  Author Keywords: Rapid Decompression Coal Mines Desorption Energetic Failure Failure Analysis Gas Desorption Gas Outburst Geotechnical Engineering Porous Materials Rock Mechanics Underground Mining

  More +
• DOI:
  https://doi.org/10.1016/j.jrmge.2015.01.004
• ISSN:
  1674-7755
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  6 pdf pages
• Volume:
  7
• Issue:
  3
• NIOSHTIC Number:
  nn:20069094
• Citation:
  J Rock Mech Geotech Eng 2015 Jun; 7(3):345-350
• Email:
  szw138@gmail.com
• Federal Fiscal Year:
  2015
• Performing Organization:
  The Pennsylvania State University
• Peer Reviewed:
  True
• Start Date:
  20080626
• End Date:
  20120731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3c7f5ad09fb942f9de2f3f21d11b61f269d42b471e138b0683e47c24eff78354fd30fd24fc487640e64462aa1ddf2674cb256fd135b36111c31a263b6408f95a
• Download URL:
  https://stacks.cdc.gov/view/cdc/207639/cdc_207639_DS1.pdf
• File Type:
  [PDF - 1009.33 KB ]