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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Geotechnical and geological engineering 4 (1986), S. 111-127 
    ISSN: 1573-1529
    Keywords: Layout design ; yield pillars ; longwall ; two-seam mining ; stability analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary Results of instrumentation, test mining and computer aided stability analyses were combined to design the most stable gate road layout for two-seam longwall mining at the Plateau Mining Company. Five layouts were evaluated; these layouts used a combination of yield and/or large pillars with either three-entry or two-entry development systems. A layout which used a yield pillar within a two-entry development system resulted in the most stable gate roads for two-seam mining. Another layout using a yield and large pillar was shown to be most stable for single-seam mining of the top seam, but it was unsuitable for two-seam mining because of seam interaction problems. The size of the yield pillar was determined by satisfying several design requirements, as well as by limited test mining; test results showed good, medium-term stability for the yield pillars, with a possible need for rib control. It was shown that the yield pillars might be effective in controlling the floor heave, and could minimize interaction problems in two-seam mining.
    Type of Medium: Electronic Resource
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