Accession Number:

ADA021981

Title:

Strain Rate Effect on the Strength of Frozen Silt.

Descriptive Note:

Research rept.,

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s):

• Haynes,F. D.
• Karalius,J. A.
• Kalafut,J.

Report Date:

1975-12-01

Pagination or Media Count:

31.0

Abstract:

Uniaxial compression and tension tests were conducted on frozen Fairbanks silt at a temperature of -10 C. A relatively stiff testing machine was operated at a constant displacement rate for each test. The tests showed that compressive strength is very sensitive to strain rate and the tensile strength is relatively insensitive to it. The compressive strength increased ten times over a srain rate range of .00012S to 2.9s. As was found in other investigations, tangent moduli increased slightly with greater strain rates. The specific eney increased at higher strain rates for compression tests and decreased slightly for tension tests. For increased strain rates, uniaxial compression strength showed no tendency to plateua nor did the specific energy a minimum during uniaxial tensile testing. Author

Descriptors:

• *SOIL MECHANICS
• *STRAIN RATE
• *SILT
• TENSILE STRENGTH
• DISPLACEMENT
• ALASKA
• STRENGTH(MECHANICS)
• FREEZING
• FAILURE(MECHANICS)
• EXCAVATION
• TENSILE TESTERS
• COMPRESSIVE PROPERTIES
• PERMAFROST

Subject Categories:

• Soil Mechanics
• Snow, Ice and Permafrost

Distribution Statement:

APPROVED FOR PUBLIC RELEASE