Experimental Research on Shear Strength of Subgrade Soil and Plasticity Index under Different Freeze-Thaw Cycles


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Three different plasticity index subgrade soils are selected from seasonal frozen soil area. Triaxial compression test under different confining pressures are executed on the samples exposed to 0 to 7 times closed-system freeze-thaw cycles. The conclusion gotten is that to the same kind of soil under the same freeze-thaw cycles, the shear strength increases with confining pressure; Shear strength with the same confining pressure decreases with the number of freeze-thaw cycles; With the same confining pressure and the same freeze-thaw cycles, shear strength increases with the plasticity index. Exponential function is adopted for multiple nonlinear fitting on the test results. The relationship between shear strength and confining pressure, plasticity index, freeze-thaw cycles is obtained and shows a good correlation.



Edited by:

Xiangdong Zhang, Hongnan Li, Xiating Feng and Zhihua Chen




J. Wang et al., "Experimental Research on Shear Strength of Subgrade Soil and Plasticity Index under Different Freeze-Thaw Cycles", Applied Mechanics and Materials, Vols. 256-259, pp. 43-47, 2013

Online since:

December 2012




* - Corresponding Author

[1] Konrad J M. Physical processes during freeze-thaw cycles in clayey silts [J]. Cold Regions Science and Technology,1989,16 (3): 291-303.

DOI: https://doi.org/10.1016/0165-232x(89)90029-3

[2] Qi Jilin,Zhang Jian-ming,Zhu Yuan-lin. Influence of freezing-thawing on soil structure and its soils mechanics significance [J]. Chinese Journal of Rock Mechanics and Engineering,2004, 22 (Supp. 2): 2690–2694.

[3] He yan. Dynamic and Static mechanical properties study on polypropylene fiber improving fly ash soil[D]. Jilin University, (2010).

[4] Wang Da-yan, Ma wei et al. Physico-mechanical properties changes of Qinghai-tibet clay due to cyclic freezing and thawing [J]. Chinese Journal of Rock Mechanics and Engineering,2005,24 (33): 4314-4319.

[5] Technical manual for soil test [M]. Beijing: China Communications Press, (2003).