Probe Drilling for Rapid Tunneling.
Proc 1st N Am Rapid Excavation and Tunneling Conf AIME 1972 1:65-87
This paper describes one of several research projects funded by the advanced research projects agency to extend the technology of rapid underground excavation. This study and field research effort are to investigate alternative means to determine rock and geological conditions in advance of a tunnel boring machine (tbm). Approximately 1 year of a planned 3-year program has resulted in the definition of three candidate drill systems. Hardware has been assembled to field test these candidates and testing has begun.
Proc. 1st N. Am. Rapid Excavation and Tunneling Conf., AIME, V. 1, Chap. 8, 1972, PP. 65-87