Title of article :
Experimental study on the ultrasonic nonlinear damage characteristics of expansive soil during constant amplitude dry-wet cycles
Author/Authors :
Huang, Z Guangxi University - Nanning, China , Wei, B School of Traffc and Transportation Engineering - Changsha University of Science and Technology - Changsha, China , Chen, Y Guangxi University - Nanning, China , Zhang, J Guangxi University - Nanning, China , Liu, Y Guangxi University - Nanning, China
Abstract :
Various control parameters of the dry-wet cycles can affect the development
of expansive soil damage. 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 drywet
cycles, the attenuation laws for the P-wave velocity were analyzed, 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. As a result, 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
cohesive force and damage degree of expansive soil show an attenuation relationship that
is well t by a logarithmic function; in general, the damage characteristics of expansive soil
are closely related to the dry-wet cyclic loading path.
Keywords :
Expansive soil , Dry-wet cycles , Fatigue damage , Wave velocity , Low-stress shear strength
Journal title :
Scientia Iranica(Transactions A: Civil Engineering)
