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Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles
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 σ 3 = 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 G d and decreasing the damping ratio λ. In a single freeze-thaw cycle, G dmax increases by a maximum of 27.6%, and λ max 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.
Highlights Different from the conventional methods, the freeze-thaw cycles are completed under confining pressure. The consolidation caused by freeze-thaw cycles will increase the dynamic shear modulus Gd and decrease the damping ratio λ of the soil. Under deviatoric stress, additional shear deformation will occur during the freeze-thaw cycles.
Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles
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 σ 3 = 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 G d and decreasing the damping ratio λ. In a single freeze-thaw cycle, G dmax increases by a maximum of 27.6%, and λ max 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.
Highlights Different from the conventional methods, the freeze-thaw cycles are completed under confining pressure. The consolidation caused by freeze-thaw cycles will increase the dynamic shear modulus Gd and decrease the damping ratio λ of the soil. Under deviatoric stress, additional shear deformation will occur during the freeze-thaw cycles.
Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles
Yang, Zhongnian (author) / Zhang, Liang (author) / Ling, Xianzhang (author) / Li, Guoyu (author) / Tu, Zhibin (author) / Shi, Wei (author)
Cold Regions, Science and Technology ; 163 ; 27-33
2019-04-09
7 pages
Article (Journal)
Electronic Resource
English
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