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Journal of Shanghai University >

2019 , Vol. 25 >Issue 6: 957 - 964

DOI: https://doi.org/10.12066/j.issn.1007-2861.1977

Research Articles

Determination of basic parameters of SWCC for clayer soils

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  • 1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China
    2. College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, Zhejiang, China

Received date: 2017-05-05

  Online published: 2019-12-31

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Abstract

A pressure plate method and vapor equilibrium technique with saturated salt solutions are used to investigate the water retention behavior of Shanghai soft clay in a wide suction range. From the relation between suction and degree of saturation, the air entry value is about 580 kPa and residual suction value is about 13.8 MPa for Shanghai soft clay layer. A method for determining air entry value using the relation between suction and water content is proposed, which is practical for the specimens with large volumetric shrinkage or deformation due to drying. Based on the deformation characteristics of the soil, the air entry value is about 600 kPa and residual suction value is about 13 MPa determined by using the above method, which is consistent with actual values. The air enter value and residual point of the specimens are determined with large volumetric shrinkage or deformation difficult to measure due to drying, as proposed by the water content versus suction relationship. This method can be used to avoid the effect of the volume measurement on the determinationof the air entry value and residual point.

Key words： Shanghai soft clay; unsaturated soil; soil-water characteristic curve (SWCC); air entry value; wide suction range

Cite this article

Dean SUN, Zhou ZHANG, You GAO, Bo CHEN . Determination of basic parameters of SWCC for clayer soils[J]. Journal of Shanghai University, 2019 , 25(6) : 957 -964 . DOI: 10.12066/j.issn.1007-2861.1977

References

[1] Fredlund D G, Rahardjo H . Soil mechanics for unsaturated soils[M]. Hoboken: John Wiley & Sons Inc, 1993.
[2] Fredlund D G, Pufahl D E . The influence of soil structure and stress history on the soil-water characteristics of a compacted till[J]. Geotechnique, 2001,51(6):573-576.
[3] Fredlund D G, Xing A Q, Fredlund M D , et al. The relationship of the unsaturated soil shear strength to the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 1996,33(3):440-448.
[4] Mualem Y . A new model for predicting the hydraulic conductivity of unsaturated porous media[J]. Water Resources Research, 1976,12(3):513-522.
[5] Kim W, Borden R H . Influence of soil type and stress state on predicting shear strength of unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 2011,48(12):1886-1900.
[6] 陈振新, 孙德安 . 非饱和上海软土的土-水和变形特性[J]. 上海大学学报(自然科学版), 2012,18(1):98-103.
[7] 叶为民, 白云, 金麒 , 等. 上海软土土水特征的室内试验研究[J]. 岩土工程学报, 2006,28(2):260-263.
[8] Greenspan L . Humidity fixed points of binary saturated aqueous solutions[J]. Journal of Research of the National Bureau of Standards, 1977,81(1):89-96.
[9] Pasha A Y, Khoshghalb A, Khalili N . Pitfalls in interpretation of gravimetric water content-based soil-water characteristic curve for deformable porous media[J]. International Journal of Geomechanics, 2016,16(6):D4015004.
[10] Cummingham M R, Ridley A M, Dineen K , et al. The mechanical behaviour of a reconstituted unsaturated silty clay[J]. Geotechnique, 2003,53(2):183-194.
[11] Fleureau J M, Siba K S, Ria S , et al. Behavior of clayey soils on drying wetting paths[J]. Canadian Geotechnical Journal, 1993 30(2):287-296.
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