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Holland-Gaddy formula

A coal pillar design formula that predicts the strength of coal pillars based on laboratory tests of coal cube strength combined with pillar height and width specifications. The Holland-Gaddy formula is generally considered to be overly conservative for large pillar width-to-height ratios (over 5).

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
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