Results 11 - 20 of 128

• Analysis of Roof Bolt Systems
  8/1/2001 - Conference papers
  A statistical study of roof bolt performance was conducted in 37 U.S. mines. Analysis of the results led to guidelines for making preliminary estimates for bolt length, capacity, and pattern to improve roof stability in difficult conditions.
• Mistakes, Misconceptions, and Key Points Regarding Secondary Roof Support Systems
  8/1/2001 - Conference papers
  This paper discusses misconceptions about how roof supports perform and factors that impact their performance. The paper is limited to a discussion of secondary roof support systems and powered roof supports such as longwall shields.
• Advance and Relieve Mining: A Method to Mitigate the Effects of High Horizontal Stress on the Mine Roof
  2/1/2001 - Conference papers
  Evaluation of the "Advance and Relieve" mining method is described to determine effectiveness for conditions where high horizontal stresses caused long running roof falls resulting in hazardous conditions and the premature abandonment of panels.
• Proceedings: New Technology for Coal Mine Roof Support
  10/1/2000 - Information Circulars
  The proceedings provide information on several new technologies including guidelines for roof bolt length, pattern, and capacity; a new design method for longwall tailgate supports; and a technique for measuring loads developed within cable bolts.
• Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
  8/1/2000 - Conference papers
  The 1990s saw an unprecedented increase in technologies for more effective, easier to install roof support in underground mines. To facilitate application and improve mine safety, NIOSH developed the Support Technology Optimization Program (STOP).
• Application of the Coal Mine Roof Rating (CMRR) to Extended Cuts
  4/1/1999 - Peer reviewed journal articles
  The Coal Mine Roof Rating (CMRR) has been widely accepted as a tool for geologic characterization and mine planning. The application of the CMRR to extended cuts (cuts greater that 6 m (20 ft) in length) is discussed.
• Technology News 455 - Roof Hazard Alert Modules
  5/1/1997 - Technology News
  The new permissible-type, intrinsically safe design modules described here represent an engineering intervention strategy toward improving miners' ability to recognize and avoid the hazardous zone of unsupported mine roof.
• Managing Ground Support for Long-Term Stability in Underground Mines
  5/2/2023 - Research projects
  A project to elucidate effective ground control management strategies and develop tools that help to forecast time-dependent processes in relation to rate or possible outcome.
• Methods to Reduce Potential for Massive Ground Collapses in Underground Stone Mines
  3/30/2023 - Research projects
  A project investigating massive ground collapses and ways to reduce the potential for collapse events.
• Ground Hazard Mitigation Using Neural Networks
  2/23/2023 - Contracts and cooperative agreements
  A contract with the University of Alaska to study ground hazard mitigation.