Results 61 - 70 of 97

• Advances in Grid-Based Numerical Modeling Techniques for Improving Gas Management in Coal Mines
  6/1/2008 - Conference papers
  This paper summarizes the modeling efforts conducted by NIOSH in the U.S. and CSIRO in Australia to address various gas management issues encountered in longwall mines using the application of computational fluid dynamics (CFD) and numerical reservoir m...
• Mine Face Ventilation: A Comparison of CFD Results Against Benchmark Experiments for the CFD Code Validation
  10/1/2007 - Peer reviewed journal articles
  To transfer CFD expertise to analyze and design a face-ventilation system, a comprehensive validation study of current CFD tools against mining-related benchmark experiments is required. This study was dedicated to the methane behavior in an empty (cont...
• Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
  7/1/2007 - Conference papers
  Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage. This study investigated the mechanism of failure caused by the presence of weak bands using numerical models.
• Evaluation of the Effects of Length on Strength of Slender Pillars in Limestone Mines Using Numerical Modeling
  7/1/2007 - Conference papers
  Numerical modeling is used to evaluate the degree the pillar strength is increased with a rectangular pillar over a square pillar.
• Proceedings: New Technology for Ground Control in Multiple-seam Mining
  5/1/2007 - Information Circulars, NIOSH/USBM numbered publications
  Multiple-seam interactions are a major ground control hazard in many U.S. underground coal mines. NIOSH has been conducting research to develop better techniques for predicting the location and severity of multiple-seam interactions.
• Multiple-Seam Mining in the United States: Background
  5/1/2007 - Information Circulars
  For the past several years, NIOSH has been conducting research to develop better techniques for predicting the location and severity of multiple-seam interactions. This paper presents the background to that study.
• Evaluation of the Strength of Slender Pillars
  1/1/2007 - Peer reviewed journal articles
  Some of the issues affecting pillar strength at low width-to-height ratios in hard, brittle rock are investigated. The results showed that the strength of slender pillars is more variable than that of wider pillars.
• Numerical Modeling of Paste Sills in Underhand Cut & Fill Stopes
  10/1/2006 - Conference papers
  This paper reviews design methodology in the placement and analysis of sill mats with reference to site observation coupled with on going numerical and analytically derived solutions.
• The Evolution of Intelligent Coal Pillar Design: 1981-2006
  8/1/2006 - Conference papers
  This paper discusses progress in the science of coal pillar design over the past 25 years and some of the current research needs.
• Numerical Modeling Procedures for Practical Coal Mine Design
  6/1/2006 - Conference papers
  A method is presented for creating realistic numerical models for practical coal mine ground control. This procedure enables realistic comparisons of the effectiveness of alternative rock support systems.