Limits of isotropic plastic deformation of Bangkok clay

TL;DR

This study applies an incremental plastic isotropic response model to Bangkok clay, demonstrating its validity in small-strain behavior and expanding its applicability to over-consolidated soft clay with OCR above 1.2 to 1.5.

Contribution

It extends the model for isotropic plastic deformation to over-consolidated soft clay, confirming its effectiveness in a broader range of clay behaviors.

Findings

Model accurately predicts small-strain behavior of Bangkok clay.

Validates the model's applicability to over-consolidated clay with OCR > 1.2.

Defines the domain of model validity in stress space.

Abstract

A model assuming incremental plastic isotropic response has been recently proposed to model the deformation of isotropic packing of grains, in the small-strain range. It is used here on over-consolidated remould clay, to interpret the small-strain range behaviour obtained in [1,2] on Bangkok clay. The data published in [1,2] at constant volume are also used here to measure the size of the domain of validity in the (q/(M'p), p/po) plane, where po is the over-consolidation isotropic pressure, p is the mean stress and q the deviatoric stress, q . So, it is shown that the model works also for clay. This enlarges the application domain of model [3,4] to soft clay with OCR larger than 1.2 to 1.5. Pacs # : 45.70.-n ; 62.20.Fe ; 83.80.Fg, 83.80.Hj