Influence of pore structure characteristics on soil-water characteristic curves under different stress states

CHEN Yu-long; HUANG Dong

doi:10.13374/j.issn2095-9389.2017.01.019

Volume 39 Issue 1

Jan. 2017

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CHEN Yu-long, HUANG Dong. Influence of pore structure characteristics on soil-water characteristic curves under different stress states[J]. Chinese Journal of Engineering, 2017, 39(1): 147-154. doi: 10.13374/j.issn2095-9389.2017.01.019

Citation:

CHEN Yu-long, HUANG Dong. Influence of pore structure characteristics on soil-water characteristic curves under different stress states[J]. Chinese Journal of Engineering, 2017, 39(1): 147-154. doi: 10.13374/j.issn2095-9389.2017.01.019

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Influence of pore structure characteristics on soil-water characteristic curves under different stress states

doi: 10.13374/j.issn2095-9389.2017.01.019

CHEN Yu-long¹,
HUANG Dong^{2
,
,}

1) Department of Civil Engineering, University of Tokyo, Tokyo 113-8656, Japan
2) Key Laboratory of Mountain Hazards and Surface Process, Chengdu 610041, China

Received Date: 2016-02-17

Abstract

Abstract

Since traditional instruments cannot apply stress in soil-water characteristic curve tests, we develop a suction controlled triaxial apparatus, by which soil-water characteristic curve tests are performed under different stress states. Further, the influence of stress state on the pore characteristics is discussed. The results show that both consolidation pressure and matrix suction can lead to the irreversible contraction deformation of soil. The soil under a larger consolidation pressure has a denser structure and a less void, leading to a smaller pore size and quantity. So it results in a worse permeability. Accordingly, it shows a better water retentivity. Air can hardly enter and water can hardly drain out, which give rise to a larger air entry value and a smaller slope of the soil-water characteristic curve. The soil-water characteristic curve of a compacted soil mainly depends upon current void ratio, not directly upon stress state. The influence of consolidation pressure on the soil-water characteristic curve is embodied in pore distribution properties. For similar pore distribution properties, the soil-water characteristic curve should be similar regardless of stress state. A larger consolidation pressure causes a less hysteresis.
- soil-water characteristic curve,
- stress state,
- pore structure,
- void ratio,
- hysteresis

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References(18)

References

[1]	Fredlund D G, Xing A Q, Fredlund M D, et al. The relationship of the unsaturated soil shear to the soil-water characteristic curve. Can Geotech J, 1996, 33(3):440
[2]	Öberg A L, Sällfors G. Determination of shear strength parameters of unsaturated silts and sands based on the water retention curve. Geotech Test J, 1997, 20(1):40
[3]	Huang S Y, Barbour S L, Fredlund D G. Development and verification of a coefficient of permeability function for a deformable unsaturated soil. Can Geotech J, 1998, 35(3):411
[4]	Lim P C, Barbour S L, Fredlund D G. The influence of degree of saturation on the coefficient of aqueous diffusion. Can Geotech J, 1998, 35(5):811
[5]	Gallage C, Kodikara J, Uchimura T. Laboratory measurement of hydraulic conductivity functions of two unsaturated sandy soils during drying and wetting processes. Soils Found, 2013, 53(3):417
[6]	Ng C W W, Pang Y W. Influence of stress state on soil-water characteristics and slope stability. J Geotech Geoenviron Eng, 2000, 126(2):157
[8]	Tavakoli Dastjerdi M H, Habibagahi G, Nikooee E. Effect of confining stress on soil water retention curve and its impact on the shear strength of unsaturated soils. Vadose Zone J, 2014, 13(5):1
[9]	Irfan M, Uchimura T. Modified triaxial apparatus for determination of elastic wave velocities during infiltration tests on unsaturated soils. KSCE J Civ Eng, 2016, 20(1):197
[10]	Pham H Q. A Volume-Mass Constitutive Model for Unsaturated Soils[Dissertation]. Saskatchewan:University of Saskatchewan, 2005
[13]	Miller C J, Yesiller N, Yaldo K, et al. Impact of soil type and compaction conditions on soil water characteristic. J Geotech Geoenviron Eng, 2002, 128(9):733
[14]	Hu R, Chen Y F, Liu H H, et al. A water retention curve and unsaturated hydraulic conductivity model for deformable soils:consideration of the change in pore-size distribution. Géotechnique, 2013, 63(16):1389
[15]	Zhou A N, Sheng D C, Carter J P. Modelling the effect of initial density on soil-water characteristic curves. Géotechnique, 2012, 62(8):669
[16]	Fleureau J M, Verbrugge J C, Huergo P J, et al. Aspects of the behaviour of compacted clayey soils on drying and wetting paths. Can Geotech J, 2002, 39(6):1341
[18]	Bolt G E. Physico-chemical analysis of the compressibility of pure clays. Géotechnique, 1956, 6(2):86
[24]	Sillers W S, Fredlund D G, Zakerzadeh N. Mathematical attributes of some soil-water characteristic curve models. Geotech Geol Eng, 2001, 19(3):243
[25]	Sun D A, Sheng D C, Xu Y F. Collapse behaviour of unsaturated compacted soils with different initial densities. Can Geotech J, 2007, 44(6):673
[26]	Lee I M, Sung S G, Cho G C. Effect of stress state on the unsaturated shear strength of a weathered granite. Can Geotech J, 2005, 42(2):624
[27]	Rostami A, Habibagahi G, Ajdari M, et al. Pore network investigation on hysteresis phenomena and influence of stress state on the SWRC. Int J Geomech, 2013, 15(5):04014072