Results 221 - 230 of 282

• MULSIM/NL Application and Practitioner's Manual
  1/1/1992 - Information Circulars
  MULSIM/NL is a U.S. Bureau of Mines boundary-element-method program for calculating stresses and displacements in coal mines or thin, tabular metalliferous veins. This manual gives detailed operating instructions for MULSIM/NL and illustrates its use w...
• MULSIM/NL Theoretical and Programmer's Manual
  1/1/1992 - Information Circulars
  The program described in this U.S. Bureau of Mines report is part of the MULSIM/NL package, which features the actual BEM program described herein, as well as a preprocessor program called MULPRE/NL and a plotting postprocessor program called MULPLT/NL.
• Rib Stability: Practical Considerations to Optimize Rib Design
  1/1/1992 - Information Circulars
  Reviews the mechanics of rib failure and the relationship of coal mine geology and pillar constraint to rib instability. Strategies for choosing an effective method of rib support are considered and various rib support methods are discussed.
• Risk Profile of Cumulative Trauma Disorders of the Arm and Hand in the U.S. Mining Industry
  1/1/1992 - Information Circulars
  A U.S. Bureau of Mines review of all upper extremity cumulative trauma disorder injuries as reported by law and maintained on the MSHA accident data base from 1985 thru 1989.
• Cause of Floor Self-Heatings in an Underground Coal Mine
  1/1/1992 - Reports of Investigations
  This report presents a Bureau of Mines study to identify the causes of self-heating events beneath the floor of a deep underground coal mine. The combined results led to the conclusion that pyrite oxidation was the prime cause of the heatings.
• Mine Fire Diagnostics Applied to the Carbondale, PA Mine Fire Site
  1/1/1992 - Reports of Investigations
  The U.S. Bureau of Mines applied its mine fire diagnostic method to an abandoned anthracite mine fire site in Carbondale, Lackawanna County, PA.
• Modeling and Data Analysis of 50 to 5000 kHz Radio Wave Propagation in Coal Mines
  2/1/1990 - Contract reports
  This supplement to the final report is a collection of interim and monthly reports and working memoranda prepared during the course of this program to document the progress, methods and results of the work.
• The Effects of Roof and Floor Interface Slip on Coal Pillar Behavior
  1/1/1990 - Conference papers
  This U.S. Bureau of Mines paper discusses the importance of an interface slip mechanism between the coalbed and the surrounding strata in controlling the extent and pattern of stresses and deformations in a coal pillar.
• Rotary Drilling Techniques Used in the Beckley Coalbed
  1/1/1989 - Reports of Investigations
  The U.S. Bureau of Mines used a contact drilling strategy with short-collared assemblies in order to rotary drill long horizontal methane drainage holes in the Beckley coalbed near Glen Daniel, West Virginia. By decreasing the thrust and increasing the ...
• Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
  1/1/1987 - Reports of Investigations
  Stimulated vertical boreholes are an effective means of removing gas from coalbeds in advance of mining. This Bureau of Mines report examines the coal mine roof damage potential of stimulation treatments. Twenty-two government-sponsored stimulation trea...