Results 11 - 20 of 99

• Case History of the Response of a Longwall Entry Subjected to Concentrated Horizontal Stress
  2/1/2007 - Peer reviewed journal articles
  A study of ground behavior, reinforcement performance and stress redistribution looked at a longwall tailgate under severe horizontal stress. Comparison to field results showed that a FLAC-2D model captured the significant roof and support behavior.
• Knowledge Management and Transfer for Mine Emergency Response
  9/1/2006 - Peer reviewed journal articles
  US coal mining organizations are losing the knowledge they need to be able to respond to emergencies. Knowledge management provides a useful perspective from which to view the problem. Knowledge can be managed by cultivating it through narratives.
• Prediction of Longwall Methane Emissions and the Associated Consequences of Increasing Longwall Face Lengths: A Case Study in the Pittsburgh Coalbed
  6/1/2006 - Conference papers
  NIOSH conducted a study with the goal of characterizing methane emissions from increasing face lengths in the Pittsburgh Coalbed and providing a method of predicting emissions increases from longer faces and of planning for more methane control.
• Predicting Methane Emissions from Longer Longwall Faces by Analysis of Emission Contributors
  6/1/2006 - Conference papers
  NIOSH conducted a longwall methane emission and mining time study at a Pittsburgh Coalbed mine to predict emissions from a longer face, and developed and applied mathematical formulas and constants to characterize four emission contributors.
• Performance of Roof Support Under High Stress in a U.S. Coal Mine
  2/1/2004 - Conference papers
  The primary goal of this project was to obtain detailed data on the interaction between the mine roof and the support elements for use in modeling studies. 
• Microseismic Activity Associated With a Deep Longwall Coal Mine
  2/1/2002 - Conference papers
  A deep longwall coal mine was instrumented with a 3-D microseismic system to help determine the exact strata mechanics associated with rock failure, redistribution of stress and associated gob formation from the longwall.
• Horizontal Stress and Longwall Headgate Ground Control
  1/1/1998 - Peer reviewed journal articles
  Horizontal stresses are caused by global plate-tectonic forces. This paper presents six case histories of mines that encountered roof falls or difficult ground conditions at the headgate caused by horizontal-stress concentrations.
• Improved Longwall Automation by Utilizing Sensors to Detect the Rock Coal Interface
  2/23/2023 - Contracts and cooperative agreements
  A contract with Komatsu's Joy Global Underground Mining to investigate a technology or combination of technologies that will improve the ability to understand the location of the rock-coal interface on a longwall face.
• Two Sister Reports of Investigations on Ground Stress Research
  7/29/2020 - Publications
  Two Reports of Investigations provide detailed findings on ground stress redistribution resulting from mining, which could ultimately lead to significant improvements in the stability of mine excavations and ensure a safer working environment for miners.
• Design of an Optically Accessible Scaled-Version of a Longwall Coal Mine for Investigating Explosion Hazards
  3/25/2020 - Contract reports
  A contract to build a 1/40th scale model of a longwall coal mine.