Design of Permanent Block Stopping to Resist Strata Convergence

Details

• Personal Author:
  Berry JA ; Ray RE Jr. ; Stephenson JW ; Timko, Robert J.
• Description:
  Conventional concrete block plastered with a cementitious coating is the most common material used in the construction of permanent stoppings to direct airflow in underground mines in the US. All mines experience various degrees of strata convergence depending on depth of overburden, geological conditions, and type of roof support employed. Strata convergence will cause cracks and joint openings in masonry stoppings, resulting in significant air leakage losses. Where strata convergence is severe, complete structural failure of the stopping can ultimately occur. Reconstruction of damaged or destroyed stopping adds expensive overhead to mining operations, and even greater expenses are incurred from the additional fan horsepower required to overcome leakage losses. Ideally, a stopping should maintain high resistance to airflow while yielding to strata convergence. By properly incorporating a polyisocyanurate rigid foam material within the masonry block structure, stopping service life can be increased in mines experiencing strata convergence problems such as floor heave, roof loading, and lateral rib movement. [Description provided by NIOSH]
• Subjects:
  Minerals Mining Occupational Health Safety
• Keywords:
  Mine-workers Mineral-processing Mining-equipment Mining-industry Structural-analysis Underground-miners Underground-mining
• Series:
  Mining Publications
• ISSN:
  0026-5187
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  37
• Issue:
  11
• NIOSHTIC Number:
  nn:10004411
• Citation:
  Min Eng 1985 Nov; 37(11):1308-1312
• Federal Fiscal Year:
  1986
• Peer Reviewed:
  True
• Source Full Name:
  Mining Engineering
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1f5d14c54833b727116adbbf3ba6fb068bb3906f664d1f6b2dbdff3c4e35296b7a36374949fa9dec1aabcb2c7cbfd8e37e362dd4943a27d2b81bda3547c2a397
• Download URL:
  https://stacks.cdc.gov/view/cdc/219564/cdc_219564_DS1.pdf
• File Type:
  [PDF - 874.33 KB ]