Results 161 - 170 of 646

• Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
  7/1/2008 - Conference papers
  The objective was to determine whether a qualitative but coherent redistribution of velocity, indicating change in location of induced stress, could be imaged as mining occurred in known locations by using a local earthquake tomography software.
• Work Practices to Manage Bump Prone Ground
  7/1/2008 - Conference papers
  This paper will review current and historic work practices used internationally to minimize the hazard to miners from mining in conditions which could produce a bump.
• 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.
• Sound Restoration Hearing Protection: Genesis of a Standard Test Method
  7/1/2008 - Conference papers
  Issues related to testing the performance of sound restoration hearing protectors are outlined within this paper, and possible solutions are discussed.
• Noise Source Identification on a Continuous Mining Machine
  7/1/2008 - Conference papers
  In the Hemi-anechoic chamber of the Pittsburgh Research Laboratory noise source identification on a continuous miner was performed using phased array measurements and a frequency domain beamforming algorithm with Diagonal Removal.
• 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.
• A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
  7/1/2008 - Conference papers
  This paper describes and evaluates an engineering noise control for the roof bolting machine, namely the collapsible drill steel enclosure.
• Coal Mine Burst Prevention Controls
  7/1/2008 - Conference papers
  This paper reviews 11 prevention control techniques for coal mine bursts.
• Global Trends in Coal Mine Horizontal Stress Measurements
  7/1/2008 - Conference papers
  This paper explores the relationships between deep-seated and shallow in situ stresses in several of the world’s coalfields, using a data base of more than 350 stress measurements from underground coal mines.