Results 61 - 70 of 129

• Maximizing the Ventilation of Large-Opening Mines
  6/1/2006 - Conference papers
  NIOSH research suggest that by incorporating ventilation planning into the mine planning process, using propeller fans, developing new stopping materials and construction methods, and using long pillars to eliminate crosscuts where possible, the ventila...
• Development and Application of Reservoir Models for the Evaluation and Optimization of Longwall Methane Control Systems
  6/1/2006 - Conference papers
  This paper describes the development of reservoir models for the longwall mining environment and their application for investigating the influence of various completion design parameters on the methane drainage effectiveness of gob gas ventholes.
• Effect of Water Sprays on Airflow Movement and Methane Dilution at the Working Face
  6/1/2006 - Conference papers
  Tests were conducted in a full-scale ventilation gallery to determine the influence of mining machine-mounted water sprays on airflows and methane concentrations at the face when blowing ventilation systems are used. Test results using different spray a...
• Evaluation of the Impact of Standing Support on Ground Behavior in Longwall Tailgates
  8/1/2005 - Conference papers
  The conclusion drawn from this study was that standing supports do not have sufficient capacity to control main roof or floor loading or prevent the resulting convergence of the tailgate entry.
• Analysis of Highwall Mining Stability - The Effect of Multiple Seams and Prior Auger Mining on Design
  8/1/2005 - Conference papers
  The objective of this is paper is to review the current state of knowledge and practice in highwall mining.
• Multiple Seam Mining Interactions: Case Histories from the Harris No. 1 Mine
  8/1/2005 - Conference papers
  Results show that the remnant upper seam structure's size can influence multiple seam interaction. Specifically, smaller critically loaded upper seam pillars appear more likely to cause lower seam ground control problems than wider pillars.
• Development of Numerical Models to Investigate Permeability Changes and Gas Emission around Longwall Mining Panel
  6/1/2005 - Conference papers
  This paper describes the application of a finite difference program to develop a geomechanical model that predicts permeability changes within the rock mass.
• The Use of Nitrogen-Enhanced Foam at the Pinnacle Mine Fire
  6/1/2005 - Conference papers
  This paper evaluates the effectiveness of remotely applied nitrogen-enhanced foam to aid in efforts to isolate and suppress a mine fire.
• Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
  5/1/2005 - Conference papers
  NIOSH has initiated a reservoir modeling effort to better understand the interaction of the various geotechnical factors influencing gas flow within and to the underground longwall mining environment. A focus of this modeling effort has been (1) the pre...
• 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...