Accession Number:

AD0757114

Title:

Study of a Continuous Drill and Blast Tunneling Concept

Descriptive Note:

Final rept. 17 Aug 1972-6 Feb 1973

Corporate Author:

RAPIDEX INC BOXFORD MA

Personal Author(s):

Report Date:

1973-03-01

Pagination or Media Count:

60.0

Abstract:

A spiral drilling pattern is described which offers high efficiency drill and blast tunneling via frequent small blasts rather then the occasional large blasts of conventional practice. Preliminary design work is presented for a combined drilling, loading, shooting, and mucking machine which would stay at the tunnel face, providing continuous drill and blast progress. Advance rates in excess of 13 feet per hour in an 8 x 8 foot horseshoe tunnel are predicted using off-the-shelf except for automated explosive loading and initiation components.

Subject Categories:

  • Mining Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE