The University of Massachusetts Amherst
University of Massachusetts Amherst

Search Google Appliance


Modeling time-dependent behavior of soft sensitive clay

TitleModeling time-dependent behavior of soft sensitive clay
Publication TypeJournal Article
Year of Publication2011
AuthorsYin Z-Y, Karstunen M, Chang CS, Koskinen M, Lojander M
JournalJournal of Geotechnical and Geoenvironmental Engineering
Start Page1103
Date Published11/2011
Keywordsanisotropy, Clay, Creep, Destructuration, time dependence, Viscoplasticity

The paper focuses on investigating the destructuration process during time-dependent stress-strain evolution. For this purpose, various oedometer tests and triaxial tests on intact and reconstituted samples of soft sensitive Vanttila clay were carried out. Based on experimental observations, a new elastic viscoplastic model, extended from the overstress theory of Perzyna, is developed. The proposed model accounts for inherent and induced anisotropy, interparticle bonds and bond degradation, and viscosity. The determination of model parameters is discussed, demonstrating how all model parameters can be determined in a straightforward way and no additional test is needed for the proposed model compared to the modified Cam clay model. The model is implemented into a finite-element code, which enables coupled consolidation analyses. The model is used to simulate various strain-rate and creep tests under one-dimensional and triaxial conditions on the intact samples of Vanttila clay. The comparisons between experimental results and simulations show that the model has good predictive ability on the time-dependent behavior of a soft sensitive clay.