Thermal-Mechanical Fragmentation of Hard Rock for Rapid Excavation
Research on thermal-mechanical fragmentation of hard rock was carried out in three phases: (1) Surface heat weakening and chipping; (2) Mechanical slot cutting and thermal kerf removal; and (3) Investigation of a thermal round similar in design to an explosive round. It was found that while the surface of most of the rocks tested was weakened by heat, rock removal by impact was not enhanced by the heating process. When heat was applied to the bottom of the slots, the ridges between were readily fractured off from the rock face. Phase three is being devoted to the investigation of the feasibility of developing a thermal round which will function in principle in a manner similar to an explosive round.
G. B. Clark and T. F. Lehnhoff, "Thermal-Mechanical Fragmentation of Hard Rock for Rapid Excavation," Proceedings of the 15th Symposium of Rock Mechanics, Rock Mechanics and Explosives Research Center (RMERC), Jan 1975.
15th Symposium on Rock Mechanics
Mining and Nuclear Engineering
Mechanical and Aerospace Engineering
Keywords and Phrases
Rock Drilling; Rock Mechanics
Article - Conference proceedings
© 1975 Rock Mechanics and Explosives Research Center (RMERC), All rights reserved.
01 Jan 1975