Results 1 - 10 of 92

• Reduced Workers’ Compensation Costs With Roof Screening
  9/1/2012 - Peer reviewed journal articles
  This paper quantifies potential savings in WC premiums due to a reduction in rock fall injuries after roof screening in Pennsylvania’s underground coal mines. Two hypothetical mines with realistic injury and WC premium estimates were used.
• Potential of Roof Screening to Reduce Workers' Compensation Cost
  12/1/2010 - Peer reviewed journal articles
  Many rock fall injuries can be prevented with roof screen, but many coal mines are reluctant to use it due to added cost. This study looked at potential savings in workers' compensation premiums due reduced rock fall injuries after roof screening.
• External L5-S1 Joint Moments When Lifting Wire Mesh Screen Used to Prevent Rock Falls in Underground Mines
  9/1/2009 - Peer reviewed journal articles
  This study uses biomechanical modeling to estimate external moments about L5-S1 for sixteen lifting tasks, using two sizes of wire mesh screens, and presents recommendations to reduce spine loading.
• Stability Mapping to Examine Ground Failure Risk: A Field Study at a Limestone Mine
  7/1/2009 - Conference papers
  This paper presents a description of geologic settings, mining conditions, rockmass characterization with geotechnical risk assessment, analysis, mapping, and control techniques used at an underground stone mine in Central Pennsylvania.
• Performance Characteristics for Welded Wire Screen Used for Surface Control in Underground Coal Mines
  2/1/2009 - Conference papers
  The load-deformation characteristics and the load capacity of welded wire screen (roof screen) used to control ground fall were evaluated in the laboratory in a specially built test frame.
• Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
  1/1/2008 - Peer reviewed journal articles
  Moisture-sensitive roof rocks have contributed to time-dependent roof falls. NIOSH research proves the value of a wet/dry cycling test for rock evaluation.
• Development and Application of the Coal Mine Roof Rating (CMRR)
  5/1/2007 - Conference papers
  This paper discusses the sources used in developing the CMRR, describes the CMRR data collection and calculation procedures, and briefly presents a number of practical mining applications in which the CMRR has played a prominent role.
• Geologic Hazards and Roof Stability in Coal Mines
  10/1/2003 - Information Circulars
  This report describes the geologic origin, association, and potential danger from the most common hazards. Discussions of weak rock include drawrock, rider coals, head coal, stackrock, and stream valley effects.
• 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.