Results 1 - 10 of 16

• Stability Mapping to Examine Ground Failure Risk: A Field Study at a Limestone Mine
  7/1/2009 - Conference papers
  This paper presents a description of geologic settings, mining conditions, rockmass characterization with geotechnical risk assessment, analysis, mapping, and control techniques used at an underground stone mine in Central Pennsylvania.
• Roof Monitoring in Limestone - Experience with the Roof Monitoring Safety System (RMSS)
  1/1/2000 - Conference papers
  This paper outlines the evolution of the RMSS and how it can be used in a comprehensive, proactive ground control safety program. A case history describes the RMSS being used to evaluate a mechanical impact sealing machine at a limestone mine.
• Assessment of Stable and Failed Pillars in Underground Limestone Mines
  11/1/2008 - Peer reviewed journal articles
  This paper provides an assessment of the performance of limestone pillars as observed at 98 different locations in 34 mines in the Eastern and Midwestern regions of the United States.
• Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
  3/1/2008 - Conference papers
  This paper describes a modeling approach that can be used as a tool to evaluate potential roof failure and optimize the stability of room and pillar layouts.
• Evaluation of the Effects of Length on Strength of Slender Pillars in Limestone Mines Using Numerical Modeling
  7/1/2007 - Conference papers
  Numerical modeling is used to evaluate the degree the pillar strength is increased with a rectangular pillar over a square pillar.
• Observations and Evaluation of Floor Benching Effects on Pillar Stability in U.S. Limestone Mines
  5/1/2007 - Conference papers
  A survey of roof and pillar conditions in limestone mines has revealed that bench mining of the floor between pillars can cause instability in the pillars at the perimeter of the benched area. Numerical models were used to assess those effects.
• Technology News 520 - A Method to Characterize Risk Associated With Mine Roof Conditions
  10/1/2006 - Technology News
  Describes the Roof Fall Risk Index (RFRI), a method of systematically characterizing the risk of roof falls in underground limestone mines.
• Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
  8/1/2006 - Conference papers
  A survey of pillar conditions was carried out at 21 operating limestone mines that use the room-and-pillar method. Pillar instability is most likely caused by unfavorable geological structures in pillars with width to height ratios of less than 1.5.
• Impact of Fan Type for Reducing Respirable Dust at an Underground Limestone Crushing Facility
  6/1/2006 - Conference papers
  NIOSH researchers have demonstrated that mine-wide ventilation in large-opening stone mines can be improved by using low-pressure, high-volume propeller fans and constructing stoppings in key locations to direct and control airflow.
• Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
  1/1/2005 - Conference papers
  In some underground limestone mines, the dip may exceed 5°. This can cause roof instability, which can be exacerbated by horizontal tectonic stresses. Field studies and numerical model analyses assess the effect of dip in various stress conditions.