Unsaturated Soil Mechanics: Fundamental Challenges, Breakthroughs, and Opportunities
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 5
Abstract
Forum papers are thought-provoking opinion pieces or essays founded in fact, sometimes containing speculation, on a civil engineering topic of general interest and relevance to the readership of the journal. The views expressed in this Forum article do not necessarily reflect the views of ASCE or the Editorial Board of the journal.
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Data Availability Statement
All the experimental data reported are available from the corresponding author by request.
References
Akin, I. D., and W. J. Likos. 2014. “Specific surface area of clay using water vapor and EGME sorption methods.” Geotech. Test. J. 37 (6): 1016–1027.
Akin, I. D., and W. J. Likos. 2020. “Suction stress of clay over a wide range of saturation.” Geotech. Geol. Eng. 38 (1): 283–296. https://doi.org/10.1007/s10706-019-01016-7.
Alonso, E. E., A. Gens, and A. Josa. 1990. “A constitutive model for partly saturated soils.” Géotechnique 40 (3): 405–430. https://doi.org/10.1680/geot.1990.40.3.405.
Bear, J., and J. J. Nitao. 1995. “On equilibrium and primary variables in transport in porous media.” Transp. Porous Media 18 (2): 151–184. https://doi.org/10.1007/BF01064676.
Benson, C. H., D. E. Daniel, and P. B. Gordon. 1999. “Field performance of compacted clay liners.” J. Geotech. Geoenviron. Eng. 125 (5): 390–403. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:5(390).
Bishop, A. W. 1959. “The principle of effective stress.” Teknisk Ukeblad 106 (39): 859–863.
Brooks, R. H., and A. T. Corey. 1964. Hydraulic properties of porous media, hydrology paper 3. Fort Collins, CO: Colorado State Univ.
Butt, H.-J., and M. Kappl. 2009. Surface and interfacial forces. Berlin: Wiley.
Chen, F. H. 1975. Foundations on expansive soils. Amsterdam, Netherlands: Elsevier.
Ching, R. K. H., J. Sweeney, and D. G. Fredlund. 1984. “Increase in factor of safety due to soil suction for two Hong Kong slopes.” In Vol. 1 of Proc., 4th Int. Symp. on Landslides, 617–623. Toronto: Canadian Geotechnical Society.
Coleman, J. D. 1962. “Stress/strain relations for partly saturated soils.” Géotechnique 12 (4): 348–350. https://doi.org/10.1680/geot.1962.12.4.348.
Corte, A., and A. Higashi. 1960. Experimental research on desiccation cracks in soil. Wilmette, IL: US Army Snow Ice and Permafrost Research Establishment.
Derjaguin, B. V., N. V. Churaev, and V. M. Muller. 1987. The Derjaguin—Landau—Verwey—Overbeek (DLVO) theory of stability of lyophobic colloids: Surface forces, 293–310. Boston: Springer.
Dong, Y., and N. Lu. Forthcoming. “Measurement of suction stress and soil deformation at high suction range.” Geotech. Test. J.
Duan, C., R. Karnik, M.-C. Lu, and A. Majundar. 2012. “Evaporation- induced cavitation in nanofluidic channels.” Proc. Natl. Acad. Sci. 109 (10): 3688–3693. https://doi.org/10.1073/pnas.1014075109.
Edlefsen, N., and A. Anderson. 1943. “Thermodynamics of soil moisture.” Hilgardia 15 (2): 31–298.
Fredlund, D. G., and S. Houston. 2009. “A protocol for assessment of unsaturated soils properties for geotechnical practice.” Can. Geotech. J. 46 (6): 694–707. https://doi.org/10.1139/T09-010.
Fredlund, D. G., and N. R. Morgenstern. 1977. “Stress state variables for unsaturated soils.” J. Geotech. Eng. Div. 103 (5): 447–466.
Fredlund, D. G., and H. Rahardjo. 1993. Soil mechanics for unsaturated soils. New York: Wiley.
Fredlund, D. G., and A. Xing. 1994. “Equations for the soil-water characteristic curve.” Can. Geotech. J. 31 (4): 521–532. https://doi.org/10.1139/t94-061.
Frydman, S., and R. Baker. 2009. “Theoretical soil-water characteristic curves based on adsorption, cavitation, and a double porosity model.” Int. J. Geomech. 9 (6): 250–257. https://doi.org/10.1061/(ASCE)1532-3641(2009)9:6(250).
Hansson, K., J. Simunek, M. Mizoguchi, L.-C. Lundin, and M. T. van Genuchten. 2004. “Water flow and heat transport in frozen soil: Numerical solution and freeze-thaw applications.” Vadose Zone J. 3 (2): 693–704. https://doi.org/10.2136/vzj2004.0693.
Hilf, J. W. 1956. An investigation of pore water pressure in compact cohesive soils. Denver: US Dept. Interior and Bureau of Reclamation.
Holtz, W. G., and H. J. Gibbs. 1956. “Triaxial shear tests on pervious gravelly soils.” J. Soil Mech. Found. Div. 82 (1): 1–22.
Houston, S. L. 2019. “It is time to use unsaturated soil mechanics in routine geotechnical engineering practice.” J. Geotech. Geoenviron. Eng. 145 (5): 02519001. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002044.
Houston, S. L., P. Stauffer, M. West, E. Bradford, and W. Houston. 2018. “Use of the net partial wetting factor (NPWF) method of computation of remaining heave: A forensic study.” In Proc., 2nd Pan-Am. Conf. on Unsaturated Soils. Reston, VA: ASCE.
Israelachvili, J. N. 2011. Intermolecular and surface forces. San Diego: Academic.
Iwata, S. 1972. “Thermodynamics of soil water. I: The energy concept of soil water.” Soil Sci. 113 (3): 162–166. https://doi.org/10.1097/00010694-197203000-00003.
Khalili, N., F. Geiser, and G. E. Blight. 2004. “Effective stress in unsaturated soils: Review with new evidence.” Int. J. Geomech. 4 (2): 115–126. https://doi.org/10.1061/(ASCE)1532-3641(2004)4:2(115).
Khalili, N., and M. H. Khabbaz. 1998. “A unique relationship for for the determination of shear strength of unsaturated soils.” Géotechnique 48 (5): 681–687. https://doi.org/10.1680/geot.1998.48.5.681.
Khorshidi, M., and N. Lu. 2016. “Intrinsic relation between soil water retention and cation exchange capacity.” J. Geotech. Geoenviron. Eng. 143 (4): 04016119. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001633.
Khorshidi, M., N. Lu, I. D. Akin, and W. J. Likos. 2017a. “Intrinsic relationship between specific surface area and soil water retention.” J. Geotech. Geoenviron. Eng. 143 (1): 04016078. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001572.
Khorshidi, M., N. Lu, and A. Khorshidi. 2017b. “Intrinsic relationship between matric potential and cation hydration.” Vadose Zone J. 15 (11). https://doi.org/10.2136/vzj2016.02.0001.
Likos, W. J., and N. Lu. 2001. “Automated measurement of total suction characteristics in high-suction range: Application to assessment of swelling potential.” Transp. Res. Rec. 1755 (1): 119–128. https://doi.org/10.3141/1755-13.
Likos, W. J., and N. Lu. 2003. “An automated humidity system for measuring total suction characteristics of clays.” Geotech. Test. J. 28 (2): 178–189.
Likos, W. J., N. Lu, and W. Wenszel. 2011. “Performance of a dynamic dew point method for moisture isotherms of clays.” Geotech. Test. J. 34 (4): 373–382.
Likos, W. J., H. W. Olsen, L. Krosley, and N. Lu. 2003. “Measured and estimated suction indices for swelling potential classification.” J. Geotech. Geoenviron. Eng. 129 (7): 665–668. https://doi.org/10.1061/(ASCE)1090-0241(2003)129:7(665).
Likos, W. J., X. Song, M. Xiao, A. Cerato, and N. Lu. 2019. “Fundamental challenges in unsaturated soil mechanics.” In Geotechnical fundamentals for addressing new world challenges, Springer series in geomechanics and geoengineering, edited by N. Lu and J. K. Mitchell. Cham, Switzerland: Springer International Publishing.
Liu, Z., and X. Yu. 2013. “Physically based equation for phase composition curve of frozen soils.” Transp. Res. Rec. 2349 (1): 93–99. https://doi.org/10.3141/2349-11.
Low, P. F. 1951. “Force fields and chemical equilibrium in heterogeneous systems with special reference to soils.” Soil Sci. 71 (6): 409–418.
Lu, N. 2008. “Is matric suction a stress variable?” J. Geotech. Geoenviron. Eng. 134 (7): 899–905. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:7(899).
Lu, N. 2016. “Generalized soil water retention equation for adsorption and capillarity.” J. Geotech. Geoenviron. Eng. 142 (10): 04016051. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001524.
Lu, N. 2019. “Revisiting axis translation for unsaturated soil testing.” J. Geotech. Geoenviron. Eng. 145 (7): 02819001. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002055.
Lu, N., J. Godt, and D. Wu. 2010. “A closed-form equation for effective stress in variably saturated soil.” Water Resour. Res. 46 (5). https://doi.org/10.1029/2009WR008646.
Lu, N., and W. J. Likos. 2004. Unsaturated soil mechanics. New York: Wiley.
Lu, N., and W. J. Likos. 2006. “Suction stress characteristic curve for unsaturated soil.” J. Geotech. Geoenviron. Eng. 132 (2): 131–142. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:2(131).
Lu, N., and C. Zhang. 2019. “Soil sorptive potential: Concept, theory, and verification.” J. Geotech. Geoenviron. Eng. 145 (4): 04019006. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002025.
Malusis, M. A., and C. D. Shackelford. 2002. “Chemico-osmotic efficiency of a geosynthetic clay liner.” J. Geotech. Geoenviron. Eng. 128 (2): 97–106. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:2(97).
Martin, R. T. 1960. “Adsorbed water on clay: A review.” Clays Clay Miner. 9 (1): 28–70. https://doi.org/10.1346/CCMN.1960.0090104.
Matyas, E. L., and H. S. Radhakrishna. 1968. “Volume change characteristics of partially saturated soils.” Géotechnique 18 (4): 432–448. https://doi.org/10.1680/geot.1968.18.4.432.
Mitchell, J. K., and K. Soga. 2005. Fundamentals of soil behavior. New York: Wiley.
Murphy, K. D., J. S. McCartney, and K. S. Henry. 2015. “Evaluation of thermo-mechanical and thermal behavior of full-scale energy foundations.” Acta Geotech. 10 (2): 179–195. https://doi.org/10.1007/s11440-013-0298-4.
Nitao, J. J., and J. Bear. 1996. “Potentials and their role in transport in porous media.” Water Resour. Res. 32 (2): 225–250. https://doi.org/10.1029/95WR02715.
Oh, W. T., and S. K. Vanapalli. 2011. “Modelling the applied vertical stress and settlement relationship of shallow foundations in saturated and unsaturated sands.” Can. Geotech. J. 48 (3): 425–438. https://doi.org/10.1139/T10-079.
Olsen, H. W. 1969. “Simultaneous fluxes of liquid and charge in saturated kaolinite.” Soil Sci. Soc. Am. J. 33 (3): 338–344. https://doi.org/10.2136/sssaj1969.03615995003300030006x.
Or, D., and M. Tuller. 2002. “Cavitation during desaturation of porous media under tension.” Water Resour. Res. 38 (5): 19-1–19-14. https://doi.org/10.1029/2001WR000282.
Or, D., J. M. Wraith, and A. W. Warrick. 2002. “Soil water content and water potential relationships.” Soil Phys. Companion 1 (5): 49–84.
Peron, H., T. Hueckel, L. Laloui, and L. Hu. 2009. “Fundamentals of desiccation cracking of fine-grained soils: Experimental characterisation and mechanisms identification.” Can. Geotech. J. 46 (10): 1177–1201. https://doi.org/10.1139/T09-054.
Rahardjo, H., X. W. Li, D. G. Toll, and E. C. Leong. 2001. “The effect of antecedent rainfall on slope stability.” In Unsaturated soil concepts and their application in geotechnical practice, 371–399. Dordrecht, Netherlands: Springer.
Revil, A., and N. Lu. 2013. “Unified water isotherms for clayey porous media.” Water Resour. Res. 49 (9): 1–15. https://doi.org/10.1002/wrcr.20426.
Seed, H. B., R. J. Woodward, and R. Lundgren. 1962. “Prediction of swelling potential for compacted clays.” J. Soil Mech. Found. Div. 88 (3): 53–87.
Shackelford, C. D., N. Lu, M. A. Malusis, and K. M. Sample-Lord. 2019. “Research challenges involving coupled flows in geotechnical engineering.” In Geotechnical fundamentals for addressing new world challenges: Springer series in geomechanics and geoengineering, edited by N. Lu and J. K. Mitchell. Cham, Switzerland: Springer International Publishing.
van Genuchten, M. T. 1980. “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J. 44 (5): 892. https://doi.org/10.2136/sssaj1980.03615995004400050002x.
van Olphen, H. 1977. An introduction to clay colloid chemistry. New York: Wiley.
Zhang, C., and N. Lu. Forthcoming. “Intermolecular pressure-based soil freezing curve” Water Resour. Res.
Zhang, C., and N. Lu. 2018a. “What is the range of soil water density? Critical reviews with a unified model.” Rev. Geophys. 56 (3): 532–562. https://doi.org/10.1029/2018RG000597.
Zhang, C., and N. Lu. 2018b. “Measuring soil-water density by helium pycnometer.” J. Geotech. Geoenviron. Eng. 144 (9): 02818002. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001929.
Zhang, C., and N. Lu. 2019a. “Augmented BET equation for water adsorption on soils.” Vadose Zone J. 18 (1): 190011.
Zhang, C., and N. Lu. 2019b. “Unitary definition of matric suction.” J. Geotech. Geoenviron. Eng. 145 (2): 02818004. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002004.
Zhang, C., and N. Lu. 2020a. “Soil sorptive potential: Its determination and predicting soil water density.” J. Geotech. Geoenviron. Eng. 146 (1): 04019118. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002188.
Zhang, C., and N. Lu. 2020b. “Unified effective stress equation for soil.” J. Eng. Mech. 146 (2): 04019135. https://doi.org/10.1061/(ASCE)EM.1943-7889.0001718.
Zheng, Q., and D. J. Durben. 1991. “Liquids at large negative pressures: Water at the homogeneous nucleation limit.” Science 254 (5033): 829–832. https://doi.org/10.1126/science.254.5033.829.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 5 • May 2020
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/.
History
Received: Sep 18, 2019
Accepted: Oct 30, 2019
Published online: Mar 12, 2020
Published in print: May 1, 2020
Discussion open until: Aug 12, 2020
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