Results 21 - 30 of 79

• Coal Bed Discontinuity Effects on the Production of Degasification Boreholes and on Emissions During Longwall Mining
  10/1/2008 - Conference papers
  This study presents a numerical investigation of geological discontinues in the coalbed using reservoir simulations of the effects of partings and permeability facies and lithotype changes on the production performances of vertical and horizontal degasi...
• Evaluation of the Relative Importance of Coalbed Reservoir Parameters for Prediction of Methane Inflow Rates During Mining of Longwall Development Entries
  9/1/2008 - Peer reviewed journal articles
  This study presents a reservoir modeling approach to investigate the relative effects of different coalbed parameters on the migration of methane into development entries, and shows that this technique can be applicable to different coalbeds.
• 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.
• Explosion Hazards From Methane Emissions Related to Geologic Features in Coal Mines
  4/1/2008 - Information Circulars
  This report presents a historical framework detailing the impact of geologic features on excess gas emissions and resultant mine explosions.
• Managing Excess Gas Emissions Associated with Coal Mine Geologic Features
  6/1/2006 - Book chapters, Information Circulars
  This chapter summarizes how certain geologic features may be associated with unexpected increases in gas emissions during coal mining. These unexpected emissions have the potential to create explosive conditions in the underground workplace. Also discu...
• Forecasting Gas Emissions for Coal Mine Safety Applications
  6/1/2006 - Book chapters
  This chapter provides guidelines for determining the gas content of coalbeds, estimating the gas-in-place, and predicting gas flow and emissions before and during coal mining operations.
• Development of Numerical Models to Investigate Permeability Changes and Gas Emission around Longwall Mining Panel
  6/1/2005 - Conference papers
  This paper describes the application of a finite difference program to develop a geomechanical model that predicts permeability changes within the rock mass.
• Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
  5/1/2005 - Conference papers
  NIOSH has initiated a reservoir modeling effort to better understand the interaction of the various geotechnical factors influencing gas flow within and to the underground longwall mining environment. A focus of this modeling effort has been (1) the pre...
• Remote Monitoring of Mine Seismicity and Earthquakes Using Radio Telemetry, Computers, and the Internet
  9/1/2003 - Conference papers
  A system to collect seismic data at the Stillwater and East Boulder mines was developed to get baseline information on the magnitude and location of mining-induced seismicity to determine if the mines needed multi-channel in-mine monitoring systems.
• Current Research on Slope Movement in Mines: Use of Hyperspectral Imagery
  1/1/2000 - Conference papers
  NIOSH is investigating remote sensing technologies to detect, monitor, and mitigate surface mine hazards that lead to slope failure. A field-portable spectro-polarimetric imager and a stationary interferometric radar device are promising options.