Abstract
To study the dynamic shear modulus and damping ratio of expansive soil in high railway embankment slope engineering structures after freeze-thaw cycles, temperature-controlled dynamic triaxial testing of expansive soil under freeze-thaw cycles was carried out under confining pressures of σ3 = 10 and 50 kPa and an anisotropic consolidation ratio. The results show that the dynamic characteristics of expansive soil in slopes under freeze-thaw cycles vary significantly with the stress state. Freeze-thaw cycles cause the consolidation of expansive soil under confining pressure, increasing the dynamic shear modulus Gd and decreasing the damping ratio λ. In a single freeze-thaw cycle, Gdmax increases by a maximum of 27.6%, and λmax decreases by 7.6%. This result is different from the traditional understanding of frost heave and thaw soil structure damage theory. Under the action of deviatoric stress, the freeze-thaw cycle causes additional shear deformation of the expansive soil, thereby increasing the dynamic shear modulus of the soil.
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