Accession Number : AD0652715

Title :   EXCAVATIONS IN FROZEN GROUND. CRITICAL DEPTH SHOTS (100 AND 500 LB) IN FORT CHURCHILL TILL.

Descriptive Note : Technical rept.,

Corporate Author : SNOW ICE AND PERMAFROST RESEARCH ESTABLISHMENT WILMETTE ILL

Personal Author(s) : Benert,Robert

Report Date : JAN 1961

Pagination or Media Count : 13

Abstract : Tests were conducted from February to March 1956 at Fort Churchill (Canada) to determine if the critical depth curve obtained earlier for small charges (0.5-20 lb) could be extrapolated for larger charges. The results, based on firings of three 100-lb and four 500-lb charges of Atlas 60% gelatin dynamite, indicate that the definition for critical depth must be revised for the larger charges if the extrapolation is to be valid.

Descriptors :   (*EXPLOSIVE CHARGES, MATHEMATICAL PREDICTION), (*EXPLOSIVES, CRATERING), DRILLING, MAPPING, SILT, CRACKS, EXPLOSIONS, ROCK, PERMAFROST

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE