Influences of freeze-thaw on strength of loess under complex stress path

ZHENG Fang; SHAO Sheng-jun; WANG Song-he

doi:10.11779/CJGE2021S1041

Volume 43 Issue S1

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Chinese Journal of Geotechnical Engineering > 2021 > 43(S1): 224-228. > DOI: 10.11779/CJGE2021S1041

ZHENG Fang, SHAO Sheng-jun, WANG Song-he. Influences of freeze-thaw on strength of loess under complex stress path[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(S1): 224-228. DOI: 10.11779/CJGE2021S1041

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Influences of freeze-thaw on strength of loess under complex stress path

1.
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China
2.
Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi'an 710048, China

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Received Date: December 14, 2020
Available Online: December 05, 2022

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Abstract

Abstract

In order to investigate the influences of freeze-thaw on the strength characteristics of loess under complex stress path, the true-triaxial apparatus is used to carry out consolidation drained shear tests under the constant p stress path for the remolded loess experiencing different freeze-thaw cycles.In the freeze-thaw tests, the samples are set to go through five different freeze-thaw cycles as 0, 1, 3, 5 and 10.In the shear tests, the constant spherical stress p is controlled as 200, 300 and 400 kPa, and the b-values of the five intermediate principal stress parameters are respectively set at the value of 0, 0.25, 0.5, 0.75 and 1.The stress-strain curve of remolded loess and the strength failure line on the p-q surface of remolded loess are given.The influences of freeze-thaw cycles on the stress-strain curves of soil under different b-value conditions and the effects of freeze-thaw and b-values on the strength parameters of remolded loess are discussed.The results show that the freeze-thaw cycles have little effect on the shape of the stress-strain curve of soil, while the change of b-value has significant effect on the shape.The shear strength first decreases and then slightly increases with the number of freeze-thaw, and finally tends to be stable, while it decreases with the value of b.The cohesion first decreases with the number of freeze-thaw cycles and then tends to be stable, while it increases with the b-value and then decreases.The internal friction angle fluctuates irregularly in a small range with the number of freeze-thaw cycles, while it increases first and then decreases with the value of b in a small range.
- remolded loess,
- true-triaxial apparatus,
- freeze-thaw,
- intermediate principal stress parameter,
- strength

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