Results 81 - 90 of 129

• Pumpable Roof Supports: Developing Design Criteria by Measurement of the Ground Reaction Curve
  8/1/2003 - Conference papers
  Pumpable roof supports provide an alternative longwall tailgate roof support and have grown in usage recently. Despite the success of these supports, questions remain regarding critical design issues for optimizing the use of this technology.
• In Situ Stress Measurements at the Stillwater Mine, Nye, Montana
  6/1/2003 - Conference papers
  Using hollow inclusion stress cells, researchers obtained two in situ stress measurements from the face of two footwall lateral drifts at the Stillwater Mine near Nye, MT.
• Longwall Tailgates: The Technology for Roof Support Has Improved, but Optimization is Still Not There
  6/1/2003 - Conference papers
  The primary objective of the paper will be to discuss strata mechanics and ways in which the support and strata interaction can be evaluated to provide an optimized secondary support design, particularly standing support systems, for longwall tailgates.
• Comparison of Ore Pass Computer Simulations for Designs Against Dynamic Load
  2/1/2003 - Conference papers
  In this paper, existing ore pass design criteria rules-of-thumb using current particle flow equations are reviewed and a comparison of two computer modeling programs, Working Model (WM 2-D) and PFC2d, to simulate rock flow are investigated.
• Remote Gob Gas Venthole Monitoring and Cellular Telephone-Based Real-Time Data Transmission System
  10/1/2002 - Conference papers
  Report on the development and field testing of a solar powered, remote gob gas venthole monitoring and cellular telephone-based real-time data transmission system.
• Lightning Propagation Through the Earth and its Potential for Methane Ignitions in Abandoned Areas of Underground Coal Mines
  10/1/2002 - Conference papers
  This paper addresses the question, 'Can lightning cause potential differences capable of igniting methane-and-air mixtures at overburden depths at which underground coal mining occurs?'
• Practical Techniques to Improve the Air Quality in Underground Stone Mines
  10/1/2002 - Conference papers
  Overview of a variety of techniques and methods that can be used to improve the air quality in underground stone mines.
• Evaluating Techniques for Monitoring Rock Falls and Slope Stability
  8/1/2002 - Conference papers
  Several remote-sensing technologies are being evaluated as tools to monitor slopes for hazards and to assess slope stability.
• Deep Cover Pillar Extraction in the U.S. Coalfields
  8/1/2002 - Conference papers
  A study is described with the objective of evaluating the various methods and strategies by which panels, production pillars and barrier pillars are developed and extracted under deep cover, and to develop appropriate design guidelines.
• Detecting Problems With Mine Slope Stability
  8/1/2002 - Conference papers
  Slope stability accidents are a leading cause of fatalities at U.S. surface mines. NIOSH is conducting research to reduce these fatalities. This paper presents some of the research and potential new technologies for slope monitoring and design.