Results 321 - 330 of 646

• NIOSH Computer Programs for Bench Crest Failure Analysis in Fractured Rock
  3/1/2005 - Conference papers
  A package of bench design programs is being publicly released by the National Institute for Occupational Safety and Health (NIOSH). These programs are designed to provide a probabilistic estimate of the likelihood that various widths of catch bench will...
• Evaluation of Mine Seals Using Ground Penetrating Radar
  3/1/2005 - Conference papers
  NIOSH used ground-penetrating radar (GPR) technology to determine if each of three test mine seals were uniformly constructed. The results suggest that GPR could be used as a tool to evaluate mine seal characteristics and construction uniformity.
• Tests of Fibre-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana
  2/1/2005 - Conference papers
  Researchers conducted tests to evaluate the tensile strength, fiber count, and adhesion of shotcrete applied to panels at the Chief Joseph Mine, a research and training facility operated by Montana Tech.
• Experimental and Modeling Investigation of the Effect of Ventilation on Smoke Rollback in a Mine Entry
  2/1/2005 - Conference papers
  Diesel fuel fire experiments were conducted to determine the critical air velocity for preventing smoke rollback. Experimental results compared very well with model predictions based upon a computational fluid dynamics (CFD) fire dynamics simulator.
• Standing Support Alternatives in Western Longwalls
  2/1/2005 - Conference papers
  Western mines have had limited choices for standing support. This paper compares the performance characteristics of various support systems.
• Evaluation of Dust Exposure To Truck Drivers Following The Lead Haul Truck
  2/1/2005 - Conference papers
  This analysis will indicate safe following distances for haul trucks and other heavy equipment to avoid overexposure to respirable dust from the lead haul truck.
• Design in Weak Rock Masses: Nevada Underground Mining Operations
  2/1/2005 - Conference papers
  One focus of ground control research at NIOSH is to incorporate data on weak rock masses into existing design relationships, with an emphasis on updating the span design curve for manned entries and the overbreak curve for longhole entries. Both curves ...
• Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
  1/1/2005 - Conference papers
  In some underground limestone mines, the dip may exceed 5°. This can cause roof instability, which can be exacerbated by horizontal tectonic stresses. Field studies and numerical model analyses assess the effect of dip in various stress conditions.
• Evaluation of Person-Wearable Methane Monitors
  1/1/2005 - Conference papers
  This paper describes test procedures used to evaluate performance of methane monitors that could be used underground for continuous personal monitoring of methane. The information in this report provides data that allow the reader to make side-by side c...
• A GPS Based System for Minimizing Jolts to Heavy Equipment Operators
  10/1/2004 - Conference papers
  Describes a method for assessing equipment jolting using a combination of "black boxes" called Shox Boxes and an onboard GPS system. The resulting configuration provides an objective assessment of jolting and a chance to determine its root causes.