Abstract
The mathematical description of the water flux and swelling mechanism during wetting of unsaturated, compacted clay, is complex. The number of variables is greater than the number of available equations, and, additional relationships, theoretical or empirical, are required in order to assist in the development of a solvable framework. This paper aims at providing relevant relations based on a series of simple, one-dimensional swelling tests performed on a highly plastic, compacted clay, as well as advancing understanding of the wetting-flow-swelling mechanism. Linear relationships were observed between the percent swell and the quantity of water entering the specimens for a range of initial water contents, initial dry densities, gravity heads and vertical confining stresses. This result is upheld to a degree of saturation of approximately 85%, at which it is expected that air voids become occluded. The slopes of the linear relationships were observed to increase with increasing initial moisture content and dry density (counter-intuitively), and with decreasing gravity head and vertical stress. This observation is discussed in relation to the double porosity structure of compacted clay. The end of the linear relationship appears to coincide closely with the end of primary swelling. The linear relationships may be useful in development of additional equations for describing the water flux—swell process.
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References
Alonso EE, Pinyol NM, Gens A (2013) Compacted soil behaviour: initial state and constitutive modelling. Geotechnique 63(6):463–478
Assouline S, Selker J (2017) Introduction and evaluation of a Weibull hydraulic conductivity-pressure head relationship for unsaturated soils. Water Resour Res 53(6):4956–4964
ASTM (2014) D4546–14; Standard test methods for one-dimensional swell or collapse of soils
Baker R, Frydman S (2009) Unsaturated soil mechanics; critical review of physical foundations. Eng Geol 106:26–39
Belchoir IRM, Casagrande MDT, Zornberg JG (2017) Swelling behavior evaluation of a lime-treated expansive soil through centrifuge test. J Mater Civil Eng 29(12):04017240
Brooks RH, Corey AT (1964) Hydraulic properties of porous media. Hydrology papers, Colorado State University, 3
Buckingham E (1907) Studies on the movement of soil moisture. Bureau of Soils, Washington, D.C.: U.S. Department of Agriculture, Bulletin, 38
Delage P, Audiguier M, Cui YJ, Howat DM (1996) Micro-structure of a compacted silt. Can Geotech J 33(1):150–158
Dineen K, Colmenares JE, Ridley AM, Burland JB (1999) Suction and volume changes of a bentonite-enriched sand. Geotech Eng 137:197–201
Elsharief AM, Sufian M (2018) Time rate of swelling of compacted highly plastic clay soil from Sudan. MATEC Web Conf 149:02032
Fredlund DG, Rahardjo H, Fredlund MD (2012) Unsaturated soil mechanics in engineering practice. Wiley, New Jersey
Frydman S, Weisberg E (1991) A study of centrifuge modeling of swelling clay. In: Ko H-Y, McLean F (eds), Proceedings of the international conference—Centrifuge 91, Balkema publishers, Boulder, Colorado, pp 113–120
Gens A (2010) Soil-environment interaction in geotechnical engineering. Geotechnique 60(1):3–74
Gens A, Alonso EE (1992) A framework for the behaviour of unsaturated expansive clays. Can Geotech J 29:1013–1031
Gens A, Alonso EE, Suriol J, Lloret A (1995) Effect of structure on the volumetric behavior of a compacted soil. In: Proceedings of the first international conference on unsaturated soils, pp 83–88
Kassif G, Livneh M, Wiseman G (1969) Pavements on expansive clays. Jerusalem Academic Press, Jerusalem
Khalili N, Loret B (2001) An elasto-plastic model for non-isothermal analysis of flow and deformation in unsaturated porous media: formulation. Int J Solids Struct 38:8305–8330
Kim D-J, Jaramillo RA, Vauclin M (1999) Modeling of soil deformation and water flow in a swelling soil. Geoderma 92(3):217–238
Li X, Zhang LM (2009) Characterization of dual-structure pore-size distribution of soil. Can Geotech J 46:129–141
Miao L, Houston SL, Cui Y, Yuan J (2007) Relationship between soil structure and mechanical behavior for an expansive unsaturated clay. Can Geotech J 44:126–137
Nachum S, Talesnick M, Frydman S (2020) Effect of external hydraulic head on swelling of unsaturated clay. In: Proceedings of the 4th European conference on unsaturated soils—UNSAT2020, Lisbon
Philip JR (1968) Kinetics of sorption and volume change in clay-colloid pastes. Soil Res 6(2):249–267
Philip JR (1970) Flow in porous media. Annu Rev Fluid Mech 2(1):177–204
Pusch R (1982) Mineral-water interactions and their influence on the physical behavior of highly compacted Na bentonite. Can Geotech J 19:381–387
Rao AS, Phanikumar BR, Sharma RS (2004) Prediction of swelling characteristics of remoulded and compacted expansive soils using free swell index. Q J Eng GeolHydrogeol 37:217–226
Richards LA (1931) Capillary conduction of liquids through porous mediums. Physics 1(5):318–333
Romero E, Gens A, Lloret A (1999) Water permeability, water retention and microstructure of unsaturated compacted Boom clay. Eng Geol 54:117–127
Romero, EM (1999) Characterization and thermo-hydro mechanical behavior of unsaturated Boom clay: An experimental study. PhD Thesis. Departament D'Enginyeria del Terreny I Cartografica, Escola Tecnica Superior D'Enginyers de Camins Canals I Ports, Universsitat Politecnica de Catalonia. Barcelona, Spania
Sivakumar V, Zain J, Gallipoli D, Solan B (2015) Wetting of compacted clays under laterally restrained conditions: initial state, overburden pressure and mineralogy. Geotechnique 65(2):111–125
Sivapullaiah PV, Sridharan A, Stalin VK (1996) Swelling behaviour of soil-bentonite mixtures. Can Geotech J 33:808–814
Smiles DE, Rosenthal MJ (1968) The movement of water in swelling materials. Soil Res 6(2):237–248
Talesnick LM, Nachum S, Frydman S (2020) K0 determination using improved experimental technique. Geotechnique. https://doi.org/10.1680/jgeot.19.P.019
Tarantino A, De Col E (2008) Compaction behavior of clay. Geotechnique 58(3):199–213
Tovey NK, Frydman S, Wong KY (1973) A study of swelling clay in the scanning electron microscope. In: Proceedings of the 3rd international conference on expansive soils, Haifa Israel, vol 2, pp 45–54
Udukumburage RS, Gallage C, Dawes L (2019) Investigation of the effect of initial water content and surcharge on volume change behaviour of compacted grey vertosol. In: Proceedings of the 13th Australia New Zealand conference on geomechanics, pp 1029–1033
Van Genuchten MT (1980) A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci Soc Am J 44(5):892–898
Vanapalli S, Lu L (2012) A state-of-the art review of 1-D heave prediction methods for expansive soils. Int J Geotech Eng 6(1):15–41
Warrick AW (2003) Soil water dynamics. Oxford University Press
Yong RN (1973) On the physics of unsaturated flow in expansive clay. In: Proceedings of the third international conference on expansive clays, Haifa, Israel vol II, pp 1–9
Zaslavsky D (1964) Saturated and unsaturated flow equation in an unstable porous medium. Soil Sci 98(5):317–321
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Nachum, S., Talesnick, M. & Frydman, S. Swelling of Compacted Clay as Affected by Quantity of Water Intake and Soil Structure. Geotech Geol Eng 40, 4961–4974 (2022). https://doi.org/10.1007/s10706-022-02193-8
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DOI: https://doi.org/10.1007/s10706-022-02193-8