pillar burst

pillar burst

[′pil·ər ‚bərst]
(mining engineering)
A failure of a pillar, by crushing.
References in periodicals archive ?
The inspector, Stephen Falk, warned that attempting to remove coal from the pillars that held up the mine roof would "result in hazardous mining conditions such as pillar bursts and roof fails," which is, of course, exactly what happened last August.