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yield-pillar system

A method of roof control whereby the natural strength of the roof strata is maintained by relieving pressure in working areas and controlling transference of load to abutments that 3640 are clear of workings and roadways. The method consists of causing certain coal pillars to yield in small amounts.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
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