EXCAVATIONS IN FROZEN GROUND. CRITICAL DEPTH SHOTS (100 AND 500 LB) IN FORT CHURCHILL TILL.
SNOW ICE AND PERMAFROST RESEARCH ESTABLISHMENT WILMETTE ILL
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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.
- Snow, Ice and Permafrost