Creep of frozen silt and clay : Sayles, FH Haines, D Report. 18R US Army C.R.R.E.L. Report, AD 784 008, TR.252, July, 1974, 50P

Abstract

Unconfined compressive creep strengths and strains were measured for remolded saturated frozen Hanover silt and Suffield clay. The creep tests were conducted at the approximate stress levels of 60, 35, 20 and 5 percent of the conventional unconfined compressive strength. Testing temperatures were 15, 25, 29, and 31 degrees F (minus 9.45, minus 3.89, minus 1.67, and minus 0.56 degrees C). An equation was found for the variation of unconfined compression peak strength with temperature. Unconfined compression creep strength could be estimated by Vialov's strength equation. Long-term creep strength was less than 45 percent of unconfined compression strength and could be as low as 10 percent of this strength. An equation for the increase in long-term creep strength with the decrease in soil temperature was also found. An expression was derived for obtaining a close estimate of the long-term creep strain. The results of this investigation were in general agreement with findings of other investigators for frozen silt and clay except that Hanover silt and Suffield clay did not display the classical creep curve shape.