Step-changed strain rate effect on the stress-strain relations of clay and a constitutive modeling

摘要: Strain rate sensitivity is one of the typical time-dependent behaviors soil as well creep and stress relaxation. In particular, it known that a unique stress-strain curve exists for each different strain in clayey : isotaches characteristics. Originally, concept was proposed one-dimensional consolidation clay ; however, we can also observe characteristics relation obtained by triaxial compression test with various rates. The purpose present study to reexamine through detailed results tests on reconstituted Fukakusa constitutive modeling. Undrained both normally consolidated overconsolidated were performed constant rates step-changed wide range axial strain. show phenomenon low level It seen, this not observed ina high strain, around critical state. numerically simulated an elasto-viscoplastic model clay. found simulate trend behavior experiment. addition, stress-overshooting stress-undershooting experiment be described adequately using except