Abstract
Numerous methods have been developed to measure the unsaturated permeability in multi-step outflow experiments. Silicon micro-powder (SMP) and Guangxi Guiping clay (GGC) have been conducted by transient outflow methods in this paper. The water release upon two-steps increase in matric suction. For each step of the experiment, the water outflow from the soil specimen is weighed in real time in order to determine the change of the water content in the specimen. As a gas pressure is exerted, the difference of the matric potential between the transient water content curve (TWCC) and the soil water retention curve (SWRC) at the same water content is calculated. This difference is considered to have the potential to drive the flow of pore water. Then, the unsaturated permeability can be calculated by using Darcy’s law. This two-steps measurement method agrees with the Gardner outflow analysis method (1956), which have the same ranges of variation for unsaturated permeability. Additionally, the test time is greatly reduced, and generally takes 10 days.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
ASTM D7664: Standard Test Methods for Measurement of Hydraulic Conductivity of Unsaturated Soils. Annual Book of ASTM Standards, vol. 4.09. ASTM International, West Conshohocken (2010)
Abuhejleh, A.N., Znidarčić, D., Illangasekare, T.H.: Permeability determination for unsaturated soils. In: Unsaturated Soils, pp. 163–174. ASCE (1993)
Benson, C.H., Gribb, M.M.: Measuring unsaturated hydraulic conductivity in the laboratory and field. Geotech. Spec. Publ. 68, 113–168 (1997)
Crescimanno, G., Iovino, M.: Parameter estimation by inverse method based on one-step and multi-step outflow experiments. Geoderma 68(4), 257–277 (1995)
Elzeftawy, A., Mansell, R.S.: Hydraulic conductivity calculations for unsaturated steady-state and transient-state flow in sand. Soil Sci. Soc. Am. J. 39(4), 599–603 (1975)
Figueras, J., Gribb, M.M., McNamara, J.P.: Design of a new automated multi-step outflow test apparatus. In: AGU Fall Meeting. AGU Fall Meeting Abstracts (2006)
Gardner, W.R.: Calculation of capillary conductivity from pressure plate outflow data. Soil Sci. Soc. Am. J. 20(3), 317–320 (1956)
Hwang, S., Powers, S.E.: Using a multi-step outflow technique to estimate unsaturated hydraulic conductivity function for quartz sands with variable interfacial properties. American Geophysical Union (2001)
Kunze, R.J., Kirkham, D.: Simplified accounting for membrane impedance in capillary conductivity determinations. Soil Sci. Soc. Am. J. 26(5), 421–426 (1962)
Kool, J.B., Parker, J.C., Van Genuchten, M.T.: Determining soil hydraulic properties from one-step outflow experiments by parameter estimation: I. Theory and numerical studies. Soil Sci. Soc. Am. J. 49(6), 1348–1354 (1985)
Klute, A.: The determination of the hydraulic conductivity and diffusivity of unsaturated soils1. Soil Sci. 113(4), 264–276 (1972)
Miller, E.E., Elrick, D.E.: Dynamic determination of capillary conductivity extended for non-negligible membrane impedance1. Soil Sci. Soc. Am. J. 22(6), 483–486 (1958)
Meerdink, J.S., Benson, C.H., Khire, M.V.: Unsaturated hydraulic conductivity of two compacted barrier soils. J. Geotech. Eng. 122(7), 565–576 (1996)
Parks, J.M., Stewart, M.A., McCartney, J.S.: Validation of a centrifuge permeameter for investigation of transient infiltration and drainage flow processes in unsaturated soils. ASTM Geotech. Test. J 35(1), 182–192 (2012)
Rijtema, P.E.: Calculation of capillary conductivity from pressure plate outflow data with nonnegligible membrane impedance. Institute for Land and Water Management Research (1959)
Raimbault, G.: Diffusivite et conductivite hydrauliques de materiaux ou sols non satures en eau - mesure en laboratoire. Bull. Liaison Lab. Ponts Chauss 145, 61–68 (1986)
Shao, L.T., Wen, T.D., Guo, X.X., Sun, X.: A method for directly measuring the hydraulic conductivity of unsaturated soil. Geotech. Test. J. 40(6), 20160197 (2017)
van Dam, J.C.: Inverse method to determine soil hydraulic functions from multi-step outflow experiments. Soil Sci. Soc. Am. J. 58(3), 647–652 (1994)
van Genuchten, M.T.: A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J. 44(5), 892–898 (1980)
Vanapalli, S.K., Garga, V.K., Brisson, P.: A modified permeameter for determination of unsaturated coefficient of permeability. Geotech. Geol. Eng. 25(2), 191–202 (2007)
Znidarcic, D., Mccartney, J.S.: Testing system for hydraulic properties of unsaturated nonwoven geotextiles. Geosynth. Int. 17(5), 355–363 (2010)
Znidarcic, D., Hwang, C. Bicalho, K. V.: Experimental determination of hydraulic characteristics for unsaturated soils. In: Juca, J.F.T., de Campos, T.M.P., Marinho, F.A.M. (eds.) Proceedings of the 3rd International Conference on Unsaturated Soils, vol. 3, pp. 1137–1141. Swets & Zeitlinger, Lisse (2002)
Zornberg, J.G., McCartney, J.S.: Centrifuge permeameter for unsaturated soils I: theory and experimental philosophy. ASCE J. Geotech. Geoenviron. Eng. 136(8), 1051–1063 (2010)
Acknowledgment
This research was funded by the National Natural Science Foundation of China (No. 51479023).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Wen, T., Shao, L., Guo, X. (2018). Rapidly Determining the Unsaturated Permeability by Transient Two-Steps Outflow Experiment. In: Hu, L., Gu, X., Tao, J., Zhou, A. (eds) Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0095-0_26
Download citation
DOI: https://doi.org/10.1007/978-981-13-0095-0_26
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-0094-3
Online ISBN: 978-981-13-0095-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)