Results 371 - 380 of 646

• Biomechanical Modeling of Spinal Loading Due to Jarring and Jolting for Heavy Equipment Operators
  8/1/2003 - Conference papers
  A multi-body biomechanical model was developed that can be used to assess the risk of low back disorders due to occupational exposure to jarring and jolting from operation of heavy mobile equipment (e.g., trucks, haulers, graders, tractors, etc.)
• Considerations for Using Roof Monitors in Underground Limestone Mines in the USA
  8/1/2003 - Conference papers
  Roof Monitoring Safety Systems (RMSS) were installed in 13 underground limestone mines in 6 states. This paper analyzes the data obtained at three of the mines and provides an overview of the system, data, analysis and applications relevant to RMSS.
• 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.
• The Long-term Performance of Surface Support Liners for Ground Control in an Underground Limestone Mine
  8/1/2003 - Conference papers
  The purpose of this paper is to evaluate the preliminary findings of a long-term underground study of various types of surface support liners, and to examine installation practices that are critical for an effective liner material application.
• 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.
• Short-Encapsulation Pull Tests for Roof Bolt Evaluation at an Operating Coal Mine
  8/1/2003 - Conference papers
  This paper presents information that shows that short-encapsulation pull tests can provide the information necessary to improve ground control in variable roof conditions.
• The Effect of Standing Support Stiffness on Primary and Secondary Bolting Systems
  8/1/2003 - Conference papers
  Standing crib supports have been applied in underground mining programs to resist large roof movements and sustain high-loads. The parameter that has not been examined and is not well understood is the effect that a crib or other types of standing supp...
• Systematic Comparison of Different Seats on Shuttle Cars Used in Underground Coal Mines
  8/1/2003 - Conference papers
  A field study was conducted to evaluate four seat designs on shuttle cars, including two NIOSH-designed seats.
• 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.
• New Tools for Roof Support Evaluation and Design
  8/1/2003 - Conference papers
  This paper describes two tools NIOSH developed. The miniature data acquisition system (MIDAS) could make geotechnical instruments in underground mines more feasible. The rock strain strip, together with MIDAS, more accurately measures rock movement.