Accession Number : ADA310446

Title :   Undrained Creep Behavior of Clayey Soils.

Descriptive Note : Final rept. Jun 92-Oct 95,

Corporate Author : TEXAS UNIV AT EL PASO

Personal Author(s) : Picornell, Miguel ; Nazarian, Soheil

PDF Url : ADA310446

Report Date : MAR 1996

Pagination or Media Count : 341

Abstract : Clayey soils were used to prepare specimens possessing controlled pore solution chemistry. Specimens were consolidated and equilibrated at four different soil suction levels. Various specimens were subjected to creep/recovery tests under drained and undrained conditions in conventional triaxial cells. The results were used to make comparisons with the behaviors predicted by a nonlinear viscoelastic model, based on power law, previously recommended by the parent project. Specimens of identical characteristics were subjected to high strain rates using a dynamic triaxial test system. Each test consisted of a series of stress controlled pulses of 50 msec duration. The pulse involved a ramp-up to a peak deviatoric stress and a ramp-down to zero. The peak stress was increased for the successive pulses. The response of the specimen, and the strain time history, was recorded. With the power laws developed and fitted to the creep/recovery data, in conjunction with the modified superposition principle, the response of specimens during dynamic testing has been predicted. Closer predictions were obtained by using the model developed for undrained testing conditions.

Descriptors :   *CREEP, *SOIL CONSOLIDATION, *CLAYEY SOILS, STRESS STRAIN RELATIONS, PRESSURE GRADIENTS, MATHEMATICAL MODELS, LOAD DISTRIBUTION, STRESS ANALYSIS, TIME DEPENDENCE, STRESS TESTING, DEFORMATION, DYNAMIC RESPONSE, VISCOELASTICITY, MOISTURE CONTENT, STRAIN RATE, DRAINAGE, SHEAR STRESSES, RHEOLOGY, SOIL CHEMISTRY, LINEAR REGRESSION ANALYSIS, SOIL TESTS, SOIL STRUCTURE INTERACTIONS, AXIAL LOADS, DYNAMIC TESTS, CREEP TESTS, SOIL COMPACTION.

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE