Results 21 - 30 of 48

• A Roof Quality Index for Stone Mines Using Borescope Logging
  7/1/2009 - Conference papers
  A process is presented that relates the structures and their locations to provide a numerical value, or roof quality index that can be used to assess roof stability.
• Pillar Strength and Design Methodology for Stone Mines
  7/1/2008 - Conference papers
  This paper presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines and concludes with guidelines for applying a developed equation and selecting appropriate input parameters.
• Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
  6/1/2008 - Peer reviewed journal articles
  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.
• 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.
• Using Laser Absorption Techniques to Monitor Diesel Particulate Matter Exposure in Underground Stone Mines
  10/1/2007 - Conference papers
  This paper describes research into a laser absorption technique that enables one to measure elemental carbon concentration in diesel particulate matter in near real time.
• Noise Assessment of Stone/Aggregate Mines: Six Case Studies
  8/1/2007 - Peer reviewed journal articles
  NIOSH completed a survey of equipment sound levels and worker noise exposures in the mining industry. The findings identify the equipment and machinery likely to cause worker overexposures and the workers found to be experiencing overexposures.
• Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
  7/1/2007 - Conference papers
  Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage. This study investigated the mechanism of failure caused by the presence of weak bands using numerical models.
• Roof Stability Issues in Underground Limestone Mines in the United States
  7/1/2007 - Conference papers
  This paper presents the results of a study of roof conditions in 34 limestone mines in the Eastern and Midwestern U.S.
• An Evaluation of Microseismic Activity Associated with Major Roof Falls in a Limestone Mine: a Case Study
  2/1/2007 - Conference papers
  The goal of this study was to review periods of elevated microseismic activity and determine whether fracture activity rate can be used to anticipate roof falls. The results showed that limited success would be achieved by such a system.
• Technique to Assess Hazards in Underground Stone Mines: the Roof Fall Risk Index (RFRI)
  1/1/2007 - Peer reviewed journal articles
  A roof-fall hazard-assessment technique was developed based on engineering judgment acquired from extensive underground stone mine experience and on examination of the literature. The technique uses observational processes to assess roof fall hazard.