Results 91 - 100 of 146

• Analysis and Design of Rib Support (ADRS): A Rib Support Design Methodology for Australian Collieries
  8/1/2005 - Conference papers
  This paper summarises the results of a research project whose goal was to provide the Australian coal industry with a rib support design methodology and software tool that could be utilised by suitably qualified colliery staff.
• Tests of Fibre-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana
  2/1/2005 - Conference papers
  Researchers conducted tests to evaluate the tensile strength, fiber count, and adhesion of shotcrete applied to panels at the Chief Joseph Mine, a research and training facility operated by Montana Tech.
• Standing Support Alternatives in Western Longwalls
  2/1/2005 - Conference papers
  Western mines have had limited choices for standing support. This paper compares the performance characteristics of various support systems.
• Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
  1/1/2005 - Conference papers
  In some underground limestone mines, the dip may exceed 5°. This can cause roof instability, which can be exacerbated by horizontal tectonic stresses. Field studies and numerical model analyses assess the effect of dip in various stress conditions.
• Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
  8/1/2004 - Conference papers
  Mines with low-strength roof are much more likely to struggle with roof falls. This paper focuses on two mines in two different seams, conducting statistical analysis to determine which support combinations have proven to be most effective.
• Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings
  8/1/2004 - Conference papers
  In underground coal mines, concrete block stoppings are widely used to control mine ventilation. Researchers developed a numerical model to evaluate the performance of stopping materials and different wall geometries in a controlled environment.
• Hydraulic Prestressing Units: An Innovation in Roof Support Technology
  8/1/2004 - Conference papers
  A new generation of hydraulic mine support prestressing devices has been developed. This paper examines the performance capabilities of these inflatable prestressing units and the impact they have on the performance of various support systems.
• Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
  8/1/2004 - Conference papers
  Underground limestone mine roofs in Northern Appalachia can be subject to high horizontal stresses. A case study is presented showing that induced stress changes in the immediate roof are less likely if the pillars contain weak bedding planes.
• UDEC Modeling of an Underground Opening in a Rock Mass of Varying Quality
  5/1/2004 - Conference papers
  This paper describes a project involving modeling rock masses with varying Rock Mass Rating (RMR) values to determine the degree of instability that develops around an underground opening as a function of RMR.
• Design Parameters of Roof Support Systems for Pre-Driven Longwall Recovery Rooms
  2/1/2004 - Conference papers
  A calibrated three-dimensional finite element model, developed in conjunction with an underground test area, provided the critical components and design principals for a comprehensive parametric study.