Results 11 - 20 of 20

• Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
  8/1/2004 - Conference papers
  Underground limestone mine roofs in Northern Appalachia can be subject to high horizontal stresses. A case study is presented showing that induced stress changes in the immediate roof are less likely if the pillars contain weak bedding planes.
• Reducing the Risk of Ground Falls During Pillar Recovery
  12/1/2003 - Conference papers
  Pillar recovery has been associated with nearly one third of roof fall fatalities in underground coal mines during the past decade. This paper discusses design methods and technologies that have been transferred and implemented in mining.
• Evaluation of Pillar Recovery in Southern West Virginia
  8/1/2002 - Conference papers
  Studies have identified a number of factors for evaluating a pillar extraction plan. This paper discusses each of the factors, presents relevant accident statistics, and shows how the risk factors can be combined to estimate the overall hazard.
• Sizing of Final Stumps for Safer Pillar Extraction
  8/1/2001 - Conference papers
  The risk of major pillar falls can often be reduced by leaving final stumps, large enough to protect the intersection but small enough to not inhibit gob caving. Analyses were conducted to assess factors on the size variation of remnant stumps.
• The Forgotten Denominator: Pillar Loading
  8/1/2000 - Conference papers
  This paper addresses a deficit in pillar loading research by exploring the accuracy of empirical abutment load calculations using insight provided by an elastic overburden model, a laminated overburden model and field observations.
• Comparison of Seismic Tomography, Strain Relief, and Ultrasonic Velocity Measurements to Evaluate Stress in an Underground Pillar
  3/1/1999 - Conference papers
  An investigation of an underground pillar at a mine in Lead, SD. Using the results, researchers hypothesize that pillar rocks have the ability to withstand stress an order of magnitude greater than they currently sustain.
• Pillar Design Issues for Underground Stone Mines
  1/1/1999 - Conference papers
  This paper examines current design practices for stone mines and discusses issues for safe mine layouts so that a rational first approach towards balancing the demands for increased production can be weighed against increased risk to worker safety.
• Investigation of a Rock-Burst Site, Sunshine Mine, Kellogg, Idaho
  1/1/1997 - Conference papers
  Rock masses in deep-level mines are subject to high stresses, which can result in unexpected failure of rock into mined-out openings. Personnel from two research centers of the former U.S. Bureau of Mines, Spokane and Twin Cities, investigated a rock b...
• Behavior of a Coal Pillar Prone to Burst in the Southern Appalachian Basin of the United States
  8/1/1990 - Conference papers
  This paper describes research designed to quantify the behavior of a particular size abutment pillar prone to burst or bump (local terminology). This research has attempted to construct the stress and convergence profiles of the pillar.
• The Effects of Roof and Floor Interface Slip on Coal Pillar Behavior
  1/1/1990 - Conference papers
  This U.S. Bureau of Mines paper discusses the importance of an interface slip mechanism between the coalbed and the surrounding strata in controlling the extent and pattern of stresses and deformations in a coal pillar.