Results 331 - 340 of 646

• Evaluation of Devices to Prevent Construction Equipment Backing Incidents
  10/1/2004 - Conference papers
  Blind areas around construction equipment are a major contributing factor in incidents involving a piece of equipment striking a worker. This paper evaluates several systems for allowing equipment operators to monitor blind areas around equipment.
• NIOSH Research in Coal Dust and Explosions
  10/1/2004 - Conference papers
  The NIOSH mining research program at the Pittsburgh Research Laboratory (PRL) includes the areas of coal mine dust control and monitoring, and explosion prevention.
• 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.
• Bolt Load Changes During Initial Face Advance and Cross-Cut Breakthrough
  8/1/2004 - Conference papers
  The San Juan Mine and the National Institute for Occupational Safety and Health conducted a study to measure how development mining affected bolt loads.
• 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 Electromagnetic Emissions in a Deep Underground Mine
  8/1/2004 - Conference papers
  Field studies were conducted to record electromagnetic (EM) emissions at the Galena Mine, Wallace, Idaho. The goal of the research was to determine if EM emissions were valid precursors to imminent ground failure.
• Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings
  8/1/2004 - Conference papers
  In underground coal mines, concrete block stoppings are widely used to control mine ventilation. Researchers developed a numerical model to evaluate the performance of stopping materials and different wall geometries in a controlled environment.
• Spatial Trends in Rock Strength - Can They Be Determined From Coreholes?
  8/1/2004 - Conference papers
  Average UCS may differ between coreholes but not be statistically significant, and widely spaced coreholes may be able to identify valid spatial trends in rock strength. The paper describes NIOSH's extensive investigation into these issues.