ICGCM Papers:
Pillar Design Workshop
 
 
A Retrospective Assessment of Coal Pillar Design Methods
Pillar Mechanics Workshop Proceedings 2010
A Retrospective Assessment of Coal Pillar Design Methods
by
fiogf49gjkf0d
Daniel W Su, Sr. Geomechancial Engineer Gregory J Hasenfus, Sr. Geomechanical Engineer Coal Operations Engineering Consol Energy Inc. Canonsburg, PA
Download PDF Add to My Library
[Book] Pillar Mechanics Workshop Proceedings 2010
[Topical Area] Pillar Design Workshop
[Author] 
fiogf49gjkf0d
Daniel W Su, Sr. Geomechancial Engineer Gregory J Hasenfus, Sr. Geomechanical Engineer Coal Operations Engineering Consol Energy Inc. Canonsburg, PA
[Abstract] 
fiogf49gjkf0d
This paper demonstrates that numerical modeling can be used to predict in situ coal pillar strength, especially under non-ideal conditions where interface friction and roof and floor deformation are the primary controlling factors. It also illustrates that, despite their difference in approach, empirical, analytical and numerical pillar design methods have converged on fundamentally similar concepts of coal pillar mechanics. In addition, this paper attempts to cross-pollinate between the numerical and empirical methods, particularly for pillars in the “squat pillar” range. The combined numerical, empirical and analytical pillar design approach was employed in a Virginia coal mine to successfully control high longwall abutment stresses under deep cover.