Fundamental Concepts for the Rapid Disengagement of Frozen Soil.
Final rept. on Phase 2.
FOSTER-MILLER ASSOCIATES INC WALTHAM MASS
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A wide variety of novel disengagement processes which appeared promising as a result of the Phase I effort were investigated experimentally and analytically, including determination of the means by which they might be implemented as complete excavating system concepts. Mechanical processes, combined in an ingenious manner so as to optimize the overall effectiveness, are considered to offer the most satisfactory short-term answer to the permafrost disengagement problem. The most satisfactory primary processes include shear cutting and indentation cutting. Also satisfactory from an effectiveness standpoint is high-velocity liquid droplet impingement, but extensive development is required to advance the technology sufficiently to make it practical as a large-scale material disengagement device. Promising secondary processes include cantilever bending fracture, brittle ridge fracture and controlled explosive loading. Analysis of the various combinations of the promising primary and secondary processes resulted in three complete permafrost disengagement concepts a. Penetration and brittle ridge fracture, b. Kerfing and cantilever fracture, c. Penetration and airblasting. Modified author abstract
- Civil Engineering