LOW-TEMPERATURE DYNAMIC TRIAXIAL TESTING OF FROZEN EXPANSIVE SOIL-RUBBER(ESR) MIXTURES

As a lightweight,highly compressible and elastic material,the rubber reinforced soil has been successfully applied in geotechnical engineering. Many researchers have studied the static and dynamic properties of rubber mixtures at room temperature. However,as the third largest frozen soil country in the world,the research on dynamic characteristics of expansive soil-rubber (ESR) mixture in frozen state is still relatively blank. In this paper,the dynamic response characteristics of expansive soil-rubber (ESR) under freezing condition are studied with low-temperature dynamic triaxial test. The results show that:(1)The hysteresis curve of ESR during freezing is oval,and it becomes flat with the increase of rubber content; (2)The shear stress of ESR is slightly lower than that of expansive soil. When the rubber content is 10%,the shear stress of ESR is the smallest; (3)The shear modulus of ESR decreases with the increase of rubber content and shear strain; (4)During the freezing process,the damping ratio of expansive soil and ESR decreases with the increase of shear strain,and the damping ratio of ESR is larger than that of pure soil.