Results 121 - 130 of 348

• Proceedings of the International Workshop on Numerical Modeling for Underground Mine Excavation Design
  6/1/2009 - Information Circulars
  NIOSH organized the International Workshop to improve understanding of the rock response obtained from modeling. The papers address various numerical modeling approaches, rock mass modeling, and applications in coal and metal mines.
• Assessment of Engineering Noise Controls at a Talc Processing Plant
  4/1/2009 - Peer reviewed journal articles
  This report describes an investigation by NIOSH researchers to quantify sound levels and to determine the amount of sound reduction provided by engineering noise controls installed in a talc processing plant.
• Investigation into the Practical Use of Belt Air at US Longwall Operations
  2/1/2009 - Conference papers
  This paper discusses the current ventilation practices regarding the use of belt air during gateroad development and longwall panel extraction.
• Critical Review of Numerical Stress Analysis Tools for Deep Coal Longwall Panels Under Strong Strata
  2/1/2009 - Conference papers
  This report describes a study undertaken by NIOSH to more fully appreciate the application of numerical models in support of research on dynamic failure (bumps and bounces) in deep western coal mines.
• Exploration of Two Position Adjustment Methods for Underground Mine Tracking Systems
  1/1/2009 - Conference papers
  This paper introduces two position adjustment methods for mine tracking systems which use a coplanar node-path network mine model as the foundation for their development.
• Ventilating Large Opening Mines
  1/1/2009 - Peer reviewed journal articles
  This paper discusses air quality concerns and methods to improve the ventilation of large-opening mines whose entries are at least 93m² (1,000 ft²).
• 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.
• Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
  7/1/2008 - Conference papers
  This paper describes a case study where a surface-based microseismic system, using triaxial geophones in boreholes drilled from the surface, was deployed at a large limestone mine.
• Correlation of Sonic Travel Time to the Uniaxial Compressive Strength of U.S. Coal Measure Rocks
  7/1/2008 - Conference papers
  This paper describes research conducted by NIOSH aimed at developing a correlation between sonic travel time logging of exploration boreholes and estimates of coal mine roof rock strength.
• 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.