Journal of Applied Science and Engineering

Published by Tamkang University Press


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Xiang Huang1,2, Hong-bin Chen1, Xue-Jun Chen This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, De-xian Liang2, Han-ying Bai2, Yu Song1,2

1Guilin University of Technology, Guilin 541004,P.R. China
2Guangxi Key Laboratory of Geotechnical Engineering,Guilin 541004, P.R. China


Received: December 12, 2018
Accepted: February 28, 2020
Publication Date: June 1, 2020

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To develop a damage index to describe the stress-strain relationship of red clay in Guilin, the undrained triaxial tests of intact red clay under various confining pressures were conducted. Firstly, the initial deformation modulus was analyzed based on the hyperbolic strain-stress relationship and deformation modulus-confining pressure relationship. The change law of secant modulus and strain threshold value were determined based on the relationship between the axial strain and secant modulus. The variable D related with the initial elastic modulus and secant modulus are used as damage index, which increased with the increase of the principal stress difference, showing a linear relationship. The damage index was correlated with the axial strain exponentially, indicating that the damage of red clay was irreversible. The proposed variable D was used in the nonlinear damages mechanics model to compare with experimental data, and the constitutive model based on the damage index D reflected the experiment results and fitted the stress-strain curves of the red clay.

Keywords: red clay; triaxial test; damage index; evolution law of damages



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