overbreak

verb

1. (intransitive)To cave in near the edge of an excavation.

   “This proved wise as the south and west walls of the winder chamber overbroke badly and blocky ground was encountered in the area set aside for the electrical equipment.”

2. (UK, dialectal, transitive)To get over; recover from.

   “He was never able to overbreak his rheumatism.”

noun

1. Rock or earth excavated beyond the planned extent; caving in of material near the edge of an excavation.

   “The overbreak depends on several factors. Foremost among them are the following: Spacing between the joints. Shattering effect of blasting on the rock located beyond the payline.”

   “The presence of faults and joint structures in stope walls within the ore body has resulted in overbreak of ore into adjacent stopes.”