Results 11 - 20 of 91

• Geologic Hazards and Roof Stability in Coal Mines
  10/1/2003 - Information Circulars
  This report describes the geologic origin, association, and potential danger from the most common hazards. Discussions of weak rock include drawrock, rider coals, head coal, stackrock, and stream valley effects.
• Mistakes, Misconceptions, and Key Points Regarding Secondary Roof Support Systems
  8/1/2001 - Conference papers
  This paper discusses misconceptions about how roof supports perform and factors that impact their performance. The paper is limited to a discussion of secondary roof support systems and powered roof supports such as longwall shields.
• Toward Pillar Design To Prevent Collapse of Room-and-Pillar Mines
  2/1/2001 - Conference papers
  Three alternative approaches to reduce the risk of catastrophic collapse are described: containment, prevention, and full-extraction. Without good data available on post-failure pillar behavior, containment and full-extraction are the safest.
• Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
  8/1/2000 - Conference papers
  The 1990s saw an unprecedented increase in technologies for more effective, easier to install roof support in underground mines. To facilitate application and improve mine safety, NIOSH developed the Support Technology Optimization Program (STOP).
• Controlling Roof Beam Failures From High Horizontal Stresses in Underground Stone Mines
  8/1/1998 - Conference papers
  A design technique is presented which provides stone miners with a method for making stability assessments. The consequences of widening rooms, changing geology and horizontal stresses, and different rock bolts on roof beam failure are discussed.
• MIS Analysis and DINSAR Measurements – Tools for Improving Mine Ground Control Safety
  9/18/2020 - Contracts and cooperative agreements
  A capacity-building contract with the University of Utah to improve seismic coverage, instrument a yield pillar, develop an extended numerical model, and evaluate statistical methods.
• Mitigation of Groundfall Hazards Through Integration of Novel Field and Numerical Techniques
  9/18/2020 - Contracts and cooperative agreements
  A capacity-building contract with the Colorado School of Mines to develope improvements in ground characterization, monitoring, analysis, and design approaches.
• Durable Roof Support for Underground Metal Mines
  9/16/2020 - Research projects
  A project to employ state-of-the-art ground control science, in a targeted program of case studies, to develop engineering solutions for ground control hazards in underground metal mines.
• 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.
• 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.