ICGCM Papers:
Pillar Design Workshop
 
 
The In-Situ Pillar Strength and Overburden Stability In U.S. Mines
Pillar Mechanics Workshop Proceedings 2010
The In-Situ Pillar Strength and Overburden Stability In U.S. Mines
by
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Hamid Maleki, President Maleki Technologies, Inc. Spokane, WA
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[Book] Pillar Mechanics Workshop Proceedings 2010
[Topical Area] Pillar Design Workshop
[Author] 
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Hamid Maleki, President Maleki Technologies, Inc. Spokane, WA
[Abstract] 
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Prudent design of coal pillars in any mining system requires an estimation of in-situ pillar strength, overburden lateral load transfer capability, and a failure criterion. Pillar strength is typically determined using one of several different empirical pillar strength formulas. For coal reserves in the U.S., a new pillar design method was proposed based on extensive U.S. field measurements in underground mines (Maleki, 1992) which accounted for confinement effects. Field measurements in seven U.S. seams indicated highest strength for some Utah mines where the coal seam developed high confining stresses. Lower strength was measured in structurally controlled seams. This method is expanded here including the data from the weaker tertiary coal measure rocks and lower confinement for pillars with low width-toheight ratios.