Tunneling With Continuous Drill-blast-muck Systems.
Mechanical Boring or Drill and Blast Tunneling 1977 :41-60
The Bureau of Mines has sponsored three research contracts on the development of continuous drill-blast-muck systems that offer the potential of high advance rates by changing the frequency of the cycles or by performing some of the operations simultaneously. One of these systems has been abandoned after a preliminary feasibility study, the second is still in the conceptual stage, and the third shows considerable promise after a series of successful underground tests. This report presents an overview of these contracts with results to date.
Mechanical Boring or Drill and Blast Tunneling, 1977, PP. 41-60