Results 61 - 70 of 99

• 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.
• 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.
• 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...
• Design Parameters of Roof Support Systems for Pre-Driven Longwall Recovery Rooms
  2/1/2004 - Conference papers
  A calibrated three-dimensional finite element model, developed in conjunction with an underground test area, provided the critical components and design principals for a comprehensive parametric study.
• Stress Measurements for Safety Decisions in Longwall Coal
  8/1/2002 - Conference papers
  The goal of the research described here is to develop a stress monitoring system that will provide immediate information to mine managers for making daily safety decisions as areas of poor ground are mined through.
• Load and Deflection Response of Ventilation Stoppings to Longwall Abutment Loading: A Case Study
  8/1/2001 - Conference papers
  This paper presents investigations of underground measurements conducted to determine the loading response of stoppings constructed from lightweight aggregate concrete masonry units.
• Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
  7/1/2001 - Conference papers
  A system was developed to monitor rock and coal stresses during mining of an entire longwall panel. The system was designed to generate data in near real time to evaluate rock behavior in roof strata and the onset of hazardous conditions as overburden s...
• Noise Exposure in Longwall Mining and Engineering Controls Research
  6/1/2001 - Conference papers
  This paper presents a general review by NIOSH researchers of noise induced hearing loss (NIHL), the status of NIHL in mining, the results of the longwall noise surveys, and a review of the longwall engineering controls research efforts.
• A Study of the Ground Control Effects of Mining Longwall Faces Into Open or Backfilled Entries
  1/1/2001 - Peer reviewed journal articles
  This paper summarizes case studies where unusual circumstances required that a longwall retreat into or through previously driven rooms. Two types of roof failure are identified and discussed.