Results 71 - 80 of 97

• 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.
• 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 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.
• 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.
• Real-time Neural Network Application to Mine Fire - Nuisance Emissions Discrimination
  5/1/2004 - Conference papers
  Discusses implementation of a real-time neural network which can discriminate mine fires from nuisance diesel emissions as part of an atmospheric mine monitoring system in NIOSH's Safety Research Coal Mine.
• 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.
• Determination of In Situ Deformation Modulus for Cemented Rockfill
  9/1/2003 - Conference papers
  As part of safety and stability studies at three underground mines in the United States, researchers installed earth pressure cells and embedment strain gauges in cemented rockfill to measure stress and strain changes as mining progressed and the rockfi...
• Numerical Modeling of the U1A Complex at the Nevada Test Site: Model Development and Comparison of Different Drift Mining Options
  8/1/2003 - Conference papers
  A three-step method is presented to determine nonlinear stress-strain curves for boundary-element programs used in many mining applications. The method requires a suite of laboratory-scale strength tests at various confining pressures.
• Using Site Case Histories of Multiple Seam Coal Mining to Advance Mine Design
  8/1/2003 - Conference papers
  NIOSH is conducting research to develop mine design algorithms that will result in safer multiple seam mines. This paper presents an overview of multiple seam issues in the central Appalachian coalfields.
• Initial Stability Study of Large Openings for the National Underground Science Laboratory at the Homestake Mine, Lead, SD
  7/1/2002 - Conference papers
  The investigation reported here is an initial study of the stability of the first of the proposed chambers at the Homestake Mine in Lead, SD.