Results 1 - 10 of 40

• Ground Support Factor of Safety Calculator
  2/14/2022 - PC software
  Use this factor of safety calculator when designing an underground mining excavation’s ground support.
• Computer Simulation of Ground Behaviour and Rock Bolt Interaction at Emerald Mine
  8/1/2004 - Conference papers
  This paper focuses on a computer simulation used to model roof behavior and rock bolt interaction in a collaborative study of ground behavior, reinforcement performance, and stress redistribution in a coal mine entry under severe horizontal stress.
• Analysis of Roof Bolt Systems
  8/1/2001 - Conference papers
  A statistical study of roof bolt performance was conducted in 37 U.S. mines. Analysis of the results led to guidelines for making preliminary estimates for bolt length, capacity, and pattern to improve roof stability in difficult conditions.
• Proceedings: New Technology for Coal Mine Roof Support
  10/1/2000 - Information Circulars
  The proceedings provide information on several new technologies including guidelines for roof bolt length, pattern, and capacity; a new design method for longwall tailgate supports; and a technique for measuring loads developed within cable bolts.
• Loading Characteristics of Mechanical Rib Bolts Determined Through Testing and Numerical Modeling
  1/1/2020 - Peer reviewed journal articles
  A study of the loading characteristics of mechanical bolts (stiffness and capacity) installed in coal ribs at five underground coal mines.
• Ground Response to High Horizontal Stresses During Longwall Retreat and its Implications for Longwall Headgate Support
  2/19/2019 - Peer reviewed journal articles
  An article discussing roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.
• Analysis of Alternatives for Using Cable Bolts as Primary Support at Two Low-Seam Coal Mines
  1/1/2016 - Peer reviewed journal articles
  An article describing cable bolting solutions at two low-seam coal mines in similar ground conditions. Two original cable bolt based support systems and two modified systems are evaluated to estimate their ability to prevent large roof falls.
• Through-the-earth Communications Technologies Available
  8/18/2015 - News and announcements
  A feature story about through-the-earth communcations technologies available for mine emergencies.
• ARBS - Analysis of Roof Bolt Systems
  8/20/2013 - PC software
  A software program to help select roof bolts for primary support in underground coal mines
• Technology News 532 - Collapsible Drill Steel Enclosure for Reducing Roof Bolting Machine Drilling Noise
  9/1/2008 - Technology News
  Research conducted by NIOSH has focused on producing noise treatments to reduce noise generated by the Roof Bolting Machine. A drill steel enclosure for reducing roof bolting machine drilling noise has been developed as an engineering control.