Results 111 - 120 of 151

• The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
  8/1/2002 - Conference papers
  The story of how roof bolting was implemented by the mining industry, but took so long to live up to its promise, is a fascinating example of the interaction between economics, technology, regulation, and science. It still has important lessons for today.
• Deep Cover Pillar Extraction in the U.S. Coalfields
  8/1/2002 - Conference papers
  A study is described with the objective of evaluating the various methods and strategies by which panels, production pillars and barrier pillars are developed and extracted under deep cover, and to develop appropriate design guidelines.
• Detecting Problems With Mine Slope Stability
  8/1/2002 - Conference papers
  Slope stability accidents are a leading cause of fatalities at U.S. surface mines. NIOSH is conducting research to reduce these fatalities. This paper presents some of the research and potential new technologies for slope monitoring and design.
• Sizing of Final Stumps for Safer Pillar Extraction
  8/1/2001 - Conference papers
  The risk of major pillar falls can often be reduced by leaving final stumps, large enough to protect the intersection but small enough to not inhibit gob caving. Analyses were conducted to assess factors on the size variation of remnant stumps.
• Failure Characteristics of Roof Falls at an Underground Stone Mine in Southwestern Pennsylvania
  8/1/2001 - Conference papers
  The location and time of 2,007 microseismic emissions from a limestone mine were compared with mine face development and mine layout characteristics. The occurrence of roof failure zones appears to be associated with mine plan characteristics.
• Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design Features
  8/1/2001 - Conference papers
  The Support Technology Optimization Program (STOP) was updated to Version 2.3. This paper describes the additional features: including uncontrolled convergence into the design requirements for standing roof supports; the addition of design procedures fo...
• Field Evaluation of Mobile Roof Support Technologies
  8/1/2001 - Conference papers
  A historic overview of the role of mobile roof support (MRS) technologies in improving stability and worker safety is presented along with field evaluations of the MRS load rate monitoring device and other remote deformation-monitoring techniques.
• Technology News 492 - Proceedings of the Second International Workshop on Coal Pillar Mechanics and Design
  8/1/2001 - Technology News
  This paper announces the availability of the proceedings of the Second International Workshop on Coal Pillar Mechanics and Design, which includes 15 papers from leading ground control specialists from the United States and other countries.
• Emerging Technologies and the Future of Geotechnical Instrumentation
  7/1/2001 - Book chapters
  This paper discusses (1) the results of a ground-based hyperspectral imaging tool used to map the geology of an open-pit mine highwall, and (2) interferometric synthetic aperture radar and how it can be used in a variety of geotechnical situations.
• Case Studies of Cable Bolts Using Instrumented King Wires
  7/1/2001 - Conference papers
  Instrumented cable bolts were used in conjunction with existing ground control to monitor rock mass loads at various field sites. By monitoring rock mass load and displacement, more effective ground support can be selected and installed.