%0 Journal Article
%T Experimental study on the ultrasonic nonlinear damage characteristics of expansive soil during constant amplitude dry-wet cycles
%J Scientia Iranica
%I Sharif University of Technology
%Z 1026-3098
%A Huang, Z.
%A Wei, B.
%A Chen, Y.
%A Zhang, J.
%A Liu, Y.
%D 2021
%\ 08/01/2021
%V 28
%N 4
%P 2023-2036
%! Experimental study on the ultrasonic nonlinear damage characteristics of expansive soil during constant amplitude dry-wet cycles
%K Expansive soil
%K dry-wet cycles
%K fatigue damage
%K Wave velocity
%K low-stress shear strength
%R 10.24200/sci.2021.55447.4225
%X Dry-wet cycles can cause fatigue damage to expansive soil, and various control parameters of the dry-wet cycles (initial moisture content, number of dry-wet cycles, cycle amplitude, etc.) can affect the development of soil damage. Therefore, it is important to study the fatigue damage characteristics of expansive soil under dry-wet cycles of constant amplitude. This paper considers expansive soil from Baise in Guangxi, China, as the research object. Based on tests of the P-wave velocity and low-stress shear strength of expansive soil under 0-6 constant amplitude dry-wet cycles, the attenuation laws for the P-wave velocity were analysed, the damage variable of expansive soil was characterized by P-wave velocity, and the rationality of this damage variable was verified by measuring the low-stress shear strength values of expansive soil specimens. Based on the experimental P-wave velocity results, a nonlinear empirical model of fatigue damage for expansive soil was constructed. The results illustrate that the P-wave velocity of an expansive soil sample decreases nonlinearly with an increasing number of dry-wet cycles and that the damage degree increases nonlinearly with an increasing number of cycles. The P-wave velocity can be successfully used to define a representative damage variable for expansive soil.
%U https://scientiairanica.sharif.edu/article_22252_349c4d37a8c6850d697a3fff47e36f5d.pdf