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Research Papers: Offshore Geotechnics

Investigation on the Effects of Freeze-Thaw Action on the Pore Water Pressure Variations of Soils

[+] Author and Article Information
Lianhai Zhang

State Key Laboratory of Frozen Soil Engineering,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: zhanglh@lzb.ac.cn

Wei Ma

State Key Laboratory of Frozen Soil Engineering,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: mawei@lzb.ac.cn

Chengsong Yang

State Key Laboratory of Frozen Soil Engineering,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: ychsong@lzb.ac.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 16, 2017; final manuscript received May 16, 2018; published online June 28, 2018. Assoc. Editor: Lizhong Wang.

J. Offshore Mech. Arct. Eng 140(6), 062001 (Jun 28, 2018) (5 pages) Paper No: OMAE-17-1011; doi: 10.1115/1.4040375 History: Received January 16, 2017; Revised May 16, 2018

Freeze-thaw action changes soil microstructure and thus has a great influence on physical and mechanical properties of soils, which is closely correlated to pore water pressure (PWP). Herein, the PWPs of sandy soil and silty clay were measured in laboratory during freeze-thaw cycles (FTC). Experimental results showed that PWP was influenced by temperature, freeze-thaw history (i.e., number of freeze-thaw cycle), soil type and others. The PWP experienced a periodical change as temperatures periodically changes during the FTC testing, the PWP decreased during freezing and increased during thawing. Soil type has a slight influence on the variation of PWP, both in character and extent. A theoretical analysis of PWP in frozen soil was given to explain the PWP changes. In addition, the PWP depression during freezing was a major driving force for water migration. The PWP variations are highly relevant to the changes in soil microstructure such as soil particle (grain size composition and mineral composition), pore structure, and particle arrangement, which will be the focus of further research.

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Figures

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Fig. 1

(a) The final soil sample dried during the PWP measurement of soil drying. (b) The PWP changes of soil sample measured by the two probes during soil drying. The PWP labeled by “Pw_water” was measured by tensiometer (2100F), and the PWP labeled by “Pw_alcohol” was measured by the new PWP probe proposed in this paper.

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Fig. 2

Changes in PWP and temperature during FTC of sample SN and CN. The vertical solid line denotes the time point when the soil freezing starts; the vertical dash line denotes the time point when the soil thawing starts.

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Fig. 3

Schematic diagram refers to the cryo-texture of the SN and CN samples

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Fig. 4

Change ranges of PWP in every freeze-thaw cycle during testing of samples SN and CN

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Fig. 5

Comparison of PWP change tendency between experiment and theory. The PWP curves labeled by “PWP for CN” and “PWP for SN” are based on the experimental data from the second FTC of sample SN and CN, respectively. The PWP curve labeled by “PWP for Eq. (3)” is the theory result based on Eq.(3).

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