Results 101 - 110 of 128

• 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.
• Developments in Sealant Support Systems for Ground Control
  8/1/2002 - Conference papers
  NIOSH has been evaluating developments in sealant support systems for ground control. This paper reviews current technology in shotcrete and membrane development, evaluates a long-term study of sealant materials, and examines installation practices.
• Shear Mechanism for Mining-Induced Fractures Applied to Rock Mechanics of Coal Mines
  8/1/2002 - Conference papers
  Two examples of an echelon mining-induced fractures seen in hard-rock mines provided a basis for inferring that fracture zones and bedding plane sap rations immediately surrounding mine openings are promoted by oblique shear into the openings.
• Feasibility of Using Laser-Based Vibration Measurements to Detect Roof Fall Hazards in Underground Mines
  6/1/2002 - Conference papers
  This paper looks at the feasibility of using noncontact laser-based vibration measurements to detect roof fall hazards with the ultimate vision of improving, expanding and automating procedures for mine roof inspection.
• 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.
• Enhanced Surface Control for Roof and Rib Support
  8/1/2001 - Conference papers
  The goal of this project was to design and evaluate devices that can be installed with traditional primary or secondary roof supports, and that are easy to handle/install under temporary or previously supported roof.
• 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.
• Design of Primary Roof Support Systems in U.S. Coal Mines Based on the Analysis of Roof Fall Rates
  6/1/2001 - Conference papers
  A study is described where information was collected at 37 coal mines on roof falls and other geotechnical, mining, geologic, and roof bolting factors. A statistical analysis was conducted on the data with roof fall rate as the outcome variable.
• Technology News 483 - Safety Training Tools for Rock Scaling Personnel
  1/1/2001 - Technology News
  Scaling, the removal of loose rock from the roofs and walls of a mine by manual or mechanized means, may be necessary during any stage of mining. Manual scaling is very labor intensive, and mechanical methods can be too powerful and actually produce a l...