TY - JOUR ID - 22252 TI - Experimental study on the ultrasonic nonlinear damage characteristics of expansive soil during constant amplitude dry-wet cycles JO - Scientia Iranica JA - SCI LA - en SN - 1026-3098 AU - Huang, Z. AU - Wei, B. AU - Chen, Y. AU - Zhang, J. AU - Liu, Y. AD - College of Civil Engineering and Architecture, Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, China AD - School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410004, China Y1 - 2021 PY - 2021 VL - 28 IS - 4 SP - 2023 EP - 2036 KW - Expansive soil KW - dry-wet cycles KW - fatigue damage KW - Wave velocity KW - low-stress shear strength DO - 10.24200/sci.2021.55447.4225 N2 - 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. UR - https://scientiairanica.sharif.edu/article_22252.html L1 - https://scientiairanica.sharif.edu/article_22252_349c4d37a8c6850d697a3fff47e36f5d.pdf ER -