Results 1 - 10 of 86

• The Ground Response Curve, Pillar Loading and Pillar Failure in Coal Mines
  7/1/2010 - Conference papers
  This paper makes use of numerical models to examine the interaction between typical pillar systems and the surrounding rock mass for weak and strong geological conditions at various spans and depths of cover.
• Modeling the Effect of Seal Leakage on Spontaneous Heating in a Longwall Gob Area
  6/1/2010 - Conference papers
  In this NIOSH study, a computational fluid dynamics (CFD) model developed in previous work is used to model the effect of seal leakage on spontaneous heating of coal in longwall gob behind the seal.
• Modeling the Effect of Barometric Pressure Changes on Spontaneous Heating in Bleederless Longwall Panels
  3/1/2010 - Conference papers
  The effect of inflow and outflow of gas on the potential spontaneous heating in the gob was investigated using the computational fluid dynamics (CFD) model.
• Performance Characteristics for Welded Wire Screen Used for Surface Control in Underground Coal Mines
  2/1/2009 - Conference papers
  The load-deformation characteristics and the load capacity of welded wire screen (roof screen) used to control ground fall were evaluated in the laboratory in a specially built test frame.
• A Gas Pressure-Based Drift Round Blast Design Methodology
  6/1/2008 - Conference papers
  The paper provides: (a) a description of the gas pressure-based design approach to blasting, (b) a simple technique for estimating the damage radius of the buffer row of holes, and (c) a discussion of smoothwall design for the contour row of holes.
• Effects of Ventilation and Gob Characteristics on Spontaneous Heating in Longwall Gob Areas
  6/1/2008 - Conference papers
  The results of field tests to understand how ventilation and gob characteristics affect the spontaneous heating process causing spontaneous combustion fires in longwall or worked-out gob areas are presented.
• Ground Control Design for Highwall Mining
  2/1/2005 - Conference papers
  Highwall stability remains a major concern during highwall mining. Geologic structure (hillseams) and pillar stability are the two major factors affecting highwall stability.
• Rock Mechanics Study of Lateral Destressing for the Advance-and-Relieve Mining Method
  8/1/2003 - Conference papers
  The advance-and-relieve method benefits from lateral destressing. Numerical modeling proved useful in studying the basic mechanics of lateral relief while investigating the sensitivity of results to different parameters using controlled experiments.
• Advance and Relieve Mining: A Method to Mitigate the Effects of High Horizontal Stress on the Mine Roof
  2/1/2001 - Conference papers
  Evaluation of the "Advance and Relieve" mining method is described to determine effectiveness for conditions where high horizontal stresses caused long running roof falls resulting in hazardous conditions and the premature abandonment of panels.
• Utilizing the 'Advance and Relieve' Method to Reduce Horizontal Stress Affects on the Mine Roof, A Case Study
  1/1/2000 - Conference papers
  The practical application of the "advance and relieve" method is discussed. A trial of the method was conducted for a room and pillar coal operation that was experiencing roof cutters and long running roof falls caused by high horizontal stresses.