Results 51 - 60 of 92

• Make it Safer with Roof Screen
  3/1/2005 - Brochures/flyers/pamphlets, Videos and multimedia
  This 7-minute video with instructional material shows how well roof screen keeps loose rock from falling in difficult roof conditions.
• Technology News 508 - NIOSH Releases New Safety Video: Make It Safer With Roof Screen
  3/1/2005 - Technology News
  Most rock fall injuries can be prevented by installing roof screen during the bolting cycle. This video and accompanying instruction booklet explain techniques for roof screen installation and use of the personal bolter screen. The video also provides s...
• Application of Ground Penetrating Radar to Evaluate the Extent of Polyurethane Grout Infiltration for Mine Roof Control: A Case Study
  8/1/2004 - Conference papers
  The study tested ground penetrating radar's ability to determine the extent of grout penetration into mine roof strata in the NIOSH Safety Research Coal Mine. The study showed that GPR technology can be useful in detecting roof changes due to grout.
• Evaluation of Polyurethane Injection for Beltway Roof Stabilization in a West Virginia Coal Mine
  8/1/2004 - Conference papers
  Polyurethane injection is a proven method of rock stabilization in even the weakest, most broken ground. Optimization of the injection design by pre-injection video diagnostics can greatly contribute to successful and efficient roof stabilization.
• Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
  8/1/2004 - Conference papers
  Mines with low-strength roof are much more likely to struggle with roof falls. This paper focuses on two mines in two different seams, conducting statistical analysis to determine which support combinations have proven to be most effective.
• Mapping Hazards with Microseismic Technology to Anticipate Roof Falls - A Case Study
  8/1/2004 - Conference papers
  More that 700 microseismic emissions were collected from two underground limestone mine roof fall areas in southwestern PA. Results reveal much about the behavior of strata prone to failure and allow for the construction of hazard maps.
• Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
  8/1/2004 - Conference papers
  Underground limestone mine roofs in Northern Appalachia can be subject to high horizontal stresses. A case study is presented showing that induced stress changes in the immediate roof are less likely if the pillars contain weak bedding planes.
• Origin of Mining-Induced Fractures Through Macroscale Distortion
  6/1/2004 - Conference papers
  NIOSH researchers have identified a pattern of fracture zone development as an explanation for fracture formation around rectangular openings in underground mines. Two computer modeling codes were used to model different aspects of this pattern.
• 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.