关键词: 冻结膨胀土, 三轴试验, 应力-应变关系

Abstract: Through the triaxial mechanical test of frozen expansive soil, the stress-strain relationships are studied under different temperatures and confining pressures. The results indicate that the stress-strain curves of frozen expansive soil all show the property of stain hardening. It is found that the deformation stage of elastic-plastic is very obvious. With decreasing temperature, the increment of deviatoric stress increases gradually in the process of deformation, and the plastic failure stress is also increases. Meanwhile, a good linear relationship between compressive strength and temperature is showed by regression analysis. With the increase of confining pressure, the stress and compressive strength increase when the soil attains the plastic deformation stage. As compared with temperature, the confining pressure influence on compressive strength is not so distinct. For fitting the experimental data, the stress-strain relationships can be described commendably through Duncan-Chang model.

Key words: frozen expansive soil, triaxial experiment, stress-strain relationships