Development of Continuous Spiral Drill and Blast Tunneler, Phase III.
Peterson-CR; Fisk-AT; Brooks-RE
NTIS: PB/276-537 Available for Reference At Bureau Libraries :100 pages
This report describes the development and testing of a prototype tunneling machine. Principal efforts were aimed at testing the fragmentation subsystem of a continuous drill and blast hard rock excavation machine suitable for use in underground mining and tunneling applications. The concept uses a unique self-shielding spiral blasting pattern that permits efficient performance with relatively small single shots, while at the same time directing major blast fragments at right angles to the tunnel axis. A major accomplishment was the development of a remote-controlled loading and initiation system in which explosive slurry and a detonator are simultaneously placed into the blasthole by a loading hose. The special electric long-delay detonator is inductively ignited upon emplacement, and the machine remains at the face during the blast.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/276-537 Available for Reference At Bureau Libraries