Effect of freeze-thaw cycles on the mechanical properties and constitutive model of saline soil

• DOI: 10.12989/gae.2021.27.4.309
• Publication Date: 2021-01-01
• Authors: Shukai Cheng; Qing Wang; Huicheng Fu; Jiaqi Wang; Yan Han; Jiejie Shen; Sen Lin
• Keywords: Shearing (physics); Strain hardening exponent; Yield surface; Plane stress; Triaxial shear test; Hardening (computing)

The freeze-thaw cycle is one of the most common natural physical processes in cold regions and will significantly affect deformation characteristics saline soil. To study mechanical properties constitutive relationship soil under cycles, this paper, a series tests consolidated-drained (CD) triaxial were conducted on remodeled Qian'an area western Jilin, China. Based elliptic-parabolic double yield surface model, modified model considering effects cycles established. results show that specimen exhibits strain-hardening stress-strain relationship, volumetric strain during shearing shear-shrinkage characteristic overall. As number increases, gradually shear strength decreases. confining pressure increases. Then, elliptic function parabolic are selected to describe volume p-q plane respectively. By introducing correlation flow rule, functional between deviating stress increment axial derived. test, variation parameters with was determined. as c, φ, h, K, n, M1, M2, decreasing while t shows increasing all factors can use logistic fit regression cycles. expression factor substituted into equation, calculated values basically consistent measured values. This be applied