Results 81 - 90 of 201

• A First Step in Developing Roof Support Design Criteria Based on Ground Reaction Data for Pittsburgh Seam Longwall Tailgate Support
  7/1/2008 - Conference papers
  In this NIOSH study to optimize standing roof support design, ground response curves were developed for longwall tailgate conditions from numerical models of Pittsburgh Coal Seam geology.
• Catastrophic Failures of Underground Evaporite Mines
  7/1/2008 - Conference papers
  This paper examines catastrophic failures of evaporite mines (including salt, potash and trona) that show that violent failure does, in fact, occur and attempts to identify common factors and characterize the mechanism of failure.
• Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
  6/1/2008 - Peer reviewed journal articles
  This paper describes a modeling approach that can be used as a tool to evaluate potential roof failure and optimize the stability of room and pillar layouts.
• Guidelines for Permitting, Construction, and Monitoring of Retention Bulkheads in Underground Coal Mines
  6/1/2008 - Information Circulars, Safety guidelines, tips, and checklists
  The guidelines in this report are to be used as a tool to identify areas or conditions that could impact the long-term stability of an underground fluid retention system and to give direction in addressing these situations.
• Three-Dimensional Time-Lapse Velocity Tomography of an Underground Longwall Panel
  6/1/2008 - Peer reviewed journal articles
  This paper describes the 3D velocity tomograms that were generated to image the stress redistribution around an underground coal longwall panel to produce a better understanding of the mechanisms that lead to ground failure, especially rockbursts.
• Rock Mass Behavior and Support Response in a Longwall Panel Pre-Driven Recovery Room
  3/1/2008 - Conference papers
  Some surprising results were revealed in this study designed and implemented by NIOSH to evaluate the effectiveness of pre-driven longwall recovery rooms supported with pumpable concrete roof supports.
• Using Mine Planning and Other Techniques to Improve Ventilation in Large-Opening Mines
  2/1/2008 - Conference papers
  This paper describes NIOSH research demonstrating that the ventilation of large-opening mines improves significantly by including ventilation requirements in the mine planning process and implementing some practical techniques during mining.
• Methods for Determining Roof Fall Risk in Underground Mines
  11/1/2007 - Peer reviewed journal articles
  This paper discusses a method to determine the roof fall risk using a qualitative risk analysis technique.
• The Brookwood Disaster and Electrical Requirements for Hazardous (Classified) Locations
  9/1/2007 - Conference papers
  Researchers with NIOSH studied the electrical equipment ignition sources for the Brookwood and other disasters to develop recommendations for preventing similar disasters.
• Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
  7/1/2007 - Conference papers
  This paper describes a project in which three-dimensional time-lapse velocity tomograms were generated to image stress redistribution around a longwall panel to produce a better understanding of the mechanisms that lead to ground failure.