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:

1961-01-01

Pagination or Media Count:

13.0

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