Determination of long-term strength of frozen loess
after numerous freeze-thaw cycles |
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| Authors: | Hong Zhou Ze Zhang WenJie Feng Jiao Ming and ZhongQiong Zhang |
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| Institution: | 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
2. Key Laboratory of Mechanics on Disaster and Environment in Western Chi;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | In order to determine the changing rule of long-term frozen soil strength and elucidate the connection between long-term
strength and soil physical properties, frozen loess was subjected to 4, 6, 8, 10, and 50 freeze-thaw cycles, under
closed-state conditions in a constant-temperature box. The frozen samples were tested on a spherical template indenter,
and the results show that under the effect of repeated freeze-thaw cycles, the long-term strength of frozen loess decreased;
changes in the mechanical property indices were highly unstable during the first 10 cycles; the soil strength and density
were the greatest at the eighth cycle while the void ratio was the smallest; and after eight cycles all of the indices had less
fluctuation and certain rising or falling tendencies. By converting the number of freeze-thaw cycles into elapsed time in
the tests, three different forecasting methods of long-term soil strength could be assessed and the soil equivalent cohesive
force after 10 years, 20 years, or 30 years could be estimated. |
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| Keywords: | frozen loess freeze-thaw long-term strength |
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