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18. Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles

Author

Guoyu Li, Liang Zhang, Tu Zhibin, Wei Shi, Zhongnian Yang, and Xianzhang Ling

Subjects
Damping ratio, Materials science, 010504 meteorology & atmospheric sciences, Consolidation (soil), Expansive clay, 0211 other engineering and technologies, Frost heaving, 02 engineering and technology, Geotechnical Engineering and Engineering Geology, Overburden pressure, 01 natural sciences, Shear modulus, Stress (mechanics), Soil structure, General Earth and Planetary Sciences, Geotechnical engineering, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences
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.

Published
2019

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