Results 91 - 100 of 128

• Effects of Far-Field Shearing Deformation on Fracturing Around an Underground Opening
  5/1/2004 - Conference papers
  Researchers are investigating the causes and mechanisms of roof failure in underground mines with the goal that better understanding these issues will lead to better layout and support designs to help prevent fall-of-ground accidents and fatalities.
• Video Motion Detection for Real-Time Hazard Warnings in Surface Mines
  2/1/2004 - Conference papers
  A surveillance system using low-cost video cameras and computer software from the security industry was tested for effectiveness in monitoring mine slopes and providing real-time warning of rock falls.
• The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls
  2/1/2004 - Conference papers
  This paper examines the capabilities of convergence and microseismic monitoring systems to better understand roof rock failure mechanics and anticipate falls. Understanding these techniques is critical in developing effective ground control strategy.
• Reducing the Risk of Ground Falls During Pillar Recovery
  12/1/2003 - Conference papers
  Pillar recovery has been associated with nearly one third of roof fall fatalities in underground coal mines during the past decade. This paper discusses design methods and technologies that have been transferred and implemented in mining.
• Root Causes of Groundfall Related Incidents in U.S. Mining Industry
  8/1/2003 - Conference papers
  This paper utilizes rock-fall-related incident narratives from the MSHA database for a taxonomic analysis, which identifies event root causes and provides future direction for corrective measures to reduce the probability of event occurrence.
• Field Performance Testing of Fully Grouted Roof Bolts
  2/1/2003 - Conference papers
  This paper reports on an extensive series of short-encapsulation pull tests that were conducted in the NIOSH Mine Safety Research Laboratory and operating mines in WV and PA.
• 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.
• Anchorage Pull Testing for Fully Grouted Roof Bolts
  8/1/2002 - Conference papers
  Despite its potential importance, there is no widely accepted anchorage test for fully grouted roof bolts. Recent studies using short encapsulation pull tests are described.