ICGCM Papers:
Pillar Design Workshop
 
 
The UNSW Pillar Design Methodology and Considerations for Using this and other Empirical Pillar System Design Approaches
Pillar Mechanics Workshop Proceedings 2010
The UNSW Pillar Design Methodology and Considerations for Using this and other Empirical Pillar System Design Approaches
by
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Jim M Galvin Professor Galvin and Associates Manly, Australia
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[Book] Pillar Mechanics Workshop Proceedings 2010
[Topical Area] Pillar Design Workshop
[Author] 
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Jim M Galvin Professor Galvin and Associates Manly, Australia
[Abstract] 
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The UNSW Coal Pillar Design Methodology was developed in 1995 using the maximum likelihood statistical approach adopted by Salamon and Munro in the 1960s and extended to account for squat and rectangular pillars. The methodology is based on back analysis of field performance to derive linear and power versions of pillar strength formulae and to assign a probability of stability to the design outcomes based on these formulae. This paper reviews some of the considerations arising out of the application of the UNSW and other empirical pillar system design approaches. Issues canvassed include confidence limits associated with the strength of rectangular shape pillars, the scope of UNSW probabilities of stability, precautions in applying modified pillar design formulations based on relationships between pillar widthto- height ratio and pillar safety factor, the effects of water pressure on pillar load and stability in flooded workings, the applicability and limitations of civil engineering based floor bearing capacity formulae, and the confidence to be placed in experimental panels.