Accession Number : AD0717240

Title :   Permafrost Tunneling by a Continuous Mechanical Method

Descriptive Note : Final rept.

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s) : Swinzow, George K

PDF Url : AD0717240

Report Date : Nov 1970

Pagination or Media Count : 42

Abstract : A mechanical method of tunneling in permafrost was investigated by excavating the Alaska Experimental Permafrost Tunnel in a perennially frozen stratum of Fairbanks silt at the edge of a gold dredge field 11 miles north of Fairbanks. The tunnel is 360 ft long and about 7 x 13 ft in cross section. It was cut by the Alkirk continuous cyclic mining method. Certain properties of the frozen silt were investigated and the tunnel was evaluated as a shelter for military purposes. Temperatures, mechanical compositions and moisture contents are discussed and observations on plastic deformation are given. The machine uses a pilot-pull principle to provide face pressure. Its potential performance was evaluated. Special observations of cutting strain and power consumption were performed and the cutting process was analyzed. It was found that the mechanical process is expedient and that with modifications the Alkirk principle promises to become a feasible method of excavating deep shelters in permafrost. Subsurface shelters in permafrost provide advantageous protection against high velocity shocks. The operations' efficiency is analyzed in the appendix.

Descriptors :   *EARTH HANDLING EQUIPMENT, *PERMAFROST, *UNDERGROUND STRUCTURES, BULKHEADS, CONVEYORS, CUTTING TOOLS, DRILLING, DRILLING MACHINES, PERFORMANCE(ENGINEERING), SOIL MECHANICS, SOILS, SUPPORTS

Subject Categories : Snow, Ice and Permafrost
      Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE