Results 51 - 60 of 77

• Longwall Tailgates: The Technology for Roof Support Has Improved, but Optimization is Still Not There
  6/1/2003 - Conference papers
  The primary objective of the paper will be to discuss strata mechanics and ways in which the support and strata interaction can be evaluated to provide an optimized secondary support design, particularly standing support systems, for longwall tailgates.
• Best Practices and Bolting Machine Innovations for Roof Screening
  2/1/2003 - Conference papers, Safety guidelines, tips, and checklists
  Injury data show a dramatic reduction in roof skin injuries when screening is used. Five case studies in which roof screen was used are presented along with the costs of materials, impact on bolting advance rates, and potential ergonomic risks.
• Stability of Underground Openings Adjacent to the Sink Hole at the NIOSH Lake Lynn Research Laboratory
  2/1/2003 - Conference papers
  This paper discusses roof monitoring, roof movement, the large roof fall, propagation of roof failures, and the recent support measures to stabilize the escapeway over a portion of the older limestone mine workings at the NIOSH Lake Lynn Laboratory.
• Roof Screening: Best Practices and Roof Bolting Machines
  8/1/2002 - Conference papers, Safety guidelines, tips, and checklists
  Roof screening has been found to be very effective in controlling the fall of small rocks from the immediate roof surface. Data is presented from two mines that show a dramatic reduction in roof skin injuries when screening is used.
• The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
  8/1/2002 - Conference papers
  The story of how roof bolting was implemented by the mining industry, but took so long to live up to its promise, is a fascinating example of the interaction between economics, technology, regulation, and science. It still has important lessons for today.
• Deep Cover Pillar Extraction in the U.S. Coalfields
  8/1/2002 - Conference papers
  A study is described with the objective of evaluating the various methods and strategies by which panels, production pillars and barrier pillars are developed and extracted under deep cover, and to develop appropriate design guidelines.
• Detecting Problems With Mine Slope Stability
  8/1/2002 - Conference papers
  Slope stability accidents are a leading cause of fatalities at U.S. surface mines. NIOSH is conducting research to reduce these fatalities. This paper presents some of the research and potential new technologies for slope monitoring and design.
• Sizing of Final Stumps for Safer Pillar Extraction
  8/1/2001 - Conference papers
  The risk of major pillar falls can often be reduced by leaving final stumps, large enough to protect the intersection but small enough to not inhibit gob caving. Analyses were conducted to assess factors on the size variation of remnant stumps.
• Failure Characteristics of Roof Falls at an Underground Stone Mine in Southwestern Pennsylvania
  8/1/2001 - Conference papers
  The location and time of 2,007 microseismic emissions from a limestone mine were compared with mine face development and mine layout characteristics. The occurrence of roof failure zones appears to be associated with mine plan characteristics.
• Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design Features
  8/1/2001 - Conference papers
  The Support Technology Optimization Program (STOP) was updated to Version 2.3. This paper describes the additional features: including uncontrolled convergence into the design requirements for standing roof supports; the addition of design procedures fo...