
Accession Number : ADA302885
Title : Creep and Strength of Frozen Soil Under Triaxial Compression.
Descriptive Note : Special rept.,
Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Personal Author(s) : Fish, Anatoly M.
PDF Url : ADA302885
Report Date : DEC 1994
Pagination or Media Count : 19
Abstract : A combined creep and strength model has been developed for the entire (primary, secondary and tertiary) creep and the longterm strength of frozen soil under multiaxial stress at both constant stresses and constant strain rates by a single (unified) constitutive equation. Secondary creep is assumed to be an inflection point of a creep curve defining time to failure. Secondary creep rate is described by a new flow law, the stress function of which includes the first invariant of the stress tensor. The model consists of four principal elements: a constitutive equation, a viscous flow equation and a yield criterion, all united by a timetofailure function. The yield criterion is selected either in the form of a parabolic (extended) von MisesDruckerPrager model or a parabolic (extended) MohrCoulomb rupture model. The criteria take into account that, at a certain magnitude of the mean normal stress (sigma sub max), the shear strength of frozen soil reaches a maximum. The yield criteria are included in the timetofailure function, the shape parameters of which are independent of the loading regime. The model has been verified using test data on creep and the longterm strength of frozen soil under triaxial compression at 10 deg C. (MM)
Descriptors : *STRENGTH(MECHANICS), *CREEP, *FROZEN SOILS, SOIL MECHANICS, RUPTURE, STRAIN RATE, ICE, YIELD STRENGTH, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, SILT, TRIAXIAL STRESSES.
Subject Categories : Soil Mechanics
Snow, Ice and Permafrost
Distribution Statement : APPROVED FOR PUBLIC RELEASE