ICGCM Papers:
Pillar Design Workshop
 
 
The Ground Response Curve, Pillar Loading and Pillar Failure in Coal Mines
Pillar Mechanics Workshop Proceedings 2010
The Ground Response Curve, Pillar Loading and Pillar Failure in Coal Mines
by
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Essie Esterhuizen, Senior Research Engineer Chris Mark, Principal Research Engineer Michael M. Murphy, Research Engineer NIOSH-Office of Mining Safety and Health Research Pittsburgh, PA
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[Book] Pillar Mechanics Workshop Proceedings 2010
[Topical Area] Pillar Design Workshop
[Author] 
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Essie Esterhuizen, Senior Research Engineer Chris Mark, Principal Research Engineer Michael M. Murphy, Research Engineer NIOSH-Office of Mining Safety and Health Research Pittsburgh, PA
[Abstract] 
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The response of the surrounding rock mass to the creation of mining excavations determines the ultimate load on a pillar support system. In conditions where the ground is relatively soft and weak, the full overburden weight can be transferred to the pillar system. However, in stiffer and stronger rocks, a greater portion of the overburden load is transferred to the unmined coal barriers or abutments, and the pillar stress is reduced. This paper makes use of numerical models to examine the interaction between typical pillar systems and the surrounding rock mass for weak and strong geological conditions at various spans and depths of cover. The concepts of structural failure and functional failure of pillars are used to assess pillar performance when pillars are deformed beyond their peak resistance. The results show that the span-to-depth ratio is an important factor in determining the pillar stress and the ultimate deformation of pillars. The ultimate pillar strain appears to be closely related to the functional success of pillar systems.