In an effort to establish a feasible method for subsurface excavation in frozen ground and to investigate physical, mechanical and thermal properties of permaforst, a 605 ft tunnel and several rooms were excavated in permafrost near Thule, Greenland. The study also investigated potentials of underground storage, camps, and shelters in permafrost as well as the extent to which permafrost may be utilized for fortifications and other military purposes. The location and environment of the tunnel, and the permafrost types are described, and details are given of the tunneling operations. The types of explosives used in the blasting are reviewed as well as the drill pattern and stemming. The results of observations are presented. A detailed description is presented of the tunnel as well as of the engineering investigation in permacrete. It is concluded that the best method for tunneling in permafrost is a cyclic system consisting of mucking, drilling, blasting and ventilating. The best drill pattern is a burn cut pattern drilled to two-thirds the width of the tunnel. Recommendations are presented. Information on skin hardness and brittleness tests, and interpretation of lithological observations are included in appendices.

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Filing Info

  • Accession Number: 00081167
  • Record Type: Publication
  • Report/Paper Numbers: 16 Fig. 2 Tab.
  • Files: TRIS
  • Created Date: Mar 26 1975 12:00AM