Modelling disturbed state and anisotropy of natural soft clays

Based on tests, electrical resistivity indexes are taken to reflect the changes in soil structures and define the disturbed variable, which is convenient, continuous, economical and practicable. Meanwhile, disturbed function is built by the results of undrained triaxial shear tests and electrical resistivity tests. Additionally, rotational hardening parameter is taken to describe disturbed state of natural soft clays; accordingly, a disturbed state concept constitutive model taking into account stress-induced anisotropy for soft clays is presented. As a result, the traditional methods measuring disturbed variable and establishing disturbed function may be optimized, and the applicability and accuracy of model may be improved. Results from undrained triaxial shear tests show that the model can describe the stress-strain characteristics fairly well and could be applied to practice.