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Research Papers: Offshore Geotechnics

Investigation of the Pore-Water Pressure of Saturated Warm Frozen Soils Under a Constant Load

[+] Author and Article Information
Hu Zhang

State Key Laboratory of Frozen Soil Engineering,
Cold and Arid Regions Environmental
and Engineering Research Institute,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: zhanghu@lzb.ac.cn

Jianming Zhang, Zhilong Zhang, Mingtang Chai

State Key Laboratory of Frozen Soil Engineering,
Cold and Arid Regions Environmental
and Engineering Research Institute,
Chinese Academy of Sciences,
Lanzhou 730000, China

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 November 17, 2015; final manuscript received June 11, 2016; published online July 29, 2016. Assoc. Editor: Colin Chun Fai Leung.

J. Offshore Mech. Arct. Eng 138(6), 062001 (Jul 29, 2016) (6 pages) Paper No: OMAE-15-1117; doi: 10.1115/1.4033936 History: Received November 17, 2015; Revised June 11, 2016

A series of compression experiments was conducted to observe the pore-water pressure variations of saturated warm frozen soils over time. The results indicate that saturated warm frozen soils can exhibit excess pore-water pressure when subjected to external loads. The pore-water pressure fluctuates rather than varying monotonically, and it gradually increases with increasing compressive deformation as the pores are compressed. Furthermore, the permeability of the soil allows pressure dissipation. Thus, the pore-water pressure is continuously changing because of the interactions between these two opposing processes. The peak pore-water pressure follows an exponential relationship with the soil temperature and decreases to a steady value as the temperature decreases. A dissipation trend is observed after the peak pressure is reached. This trend reflects the influence of consolidation in the deformation of warm frozen soils. As the temperature increases, the role of the consolidation becomes more significant.

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Figures

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Fig. 1

Schematic diagram of the experimental system

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Fig. 2

Miniature pressure transducer

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Fig. 3

Experimental system

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Fig. 4

Grain-size distribution of the studied soil

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Fig. 5

Temperatures recorded during the experiment conducted at −0.1 °C

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Fig. 6

Pore-water pressure and deformation curves at different temperatures

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Fig. 7

The dependence of the peak pore-water pressure on the soil temperature

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Fig. 8

Steady deformation strain rates at various temperatures

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Fig. 9

Schematic illustration of the variations in pore-water pressure (gridded areas: soil particles; annulus areas: unfrozen water; other areas: ice)

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