Abstract
Relative hydraulic conductivity is an important input parameter for water balance models, which are commonly used to evaluate the performance of soil covers. In this paper, pore-network modeling was utilized to analyze the influence of pore distribution characteristics on relative hydraulic conductivity at various water saturations in soils. A drainage process of water slowly invaded by air was simulated to assign various saturations in pore networks. The pore networks have 30 × 30 × 30 pores, with log-normally distributed pore diameters in different mean values and standard deviations. Numerical results indicated that the increase in standard deviation and the decrease in the mean value of the pore diameters lead to a decrease in saturated hydraulic conductivity. Larger standard deviation or lower mean value of the pore diameters can result in more evident right-skewed pore diameter distribution. This provides more throats for water to flow at a given saturation, and thus a larger relative hydraulic conductivity in the pore network.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Benson C, Abichou T, Albright W, Gee G, Roesler A (2001) Field evaluation of alternative earthen final covers. Int J Phytorem 3(1):105–127
Abichou T, Liu X, Tawfiq K (2006) Design considerations for lysimeters used to evaluate alternative earthen final covers. J Geotech Geoenviron Eng 132(12):1519–1525
Zhan LT, Li GY, Jiao WG, Wu T, Lan JW, Chen YM (2016) Field measurements of water storage capacity in a loess–gravel capillary barrier cover using rainfall simulation tests. Can Geotech J 54(11):1523–1536
Waugh WJ, Benson CH, Albright WH (2009) Sustainable covers for uranium mill tailings, USA: alternative design, performance, and renovation. In: ASME 2009 12th international conference on environmental remediation and radioactive waste management. American Society of Mechanical Engineers, Liverpool, pp 639–648
Khire MV, Benson CH, Bosscher PJ (1997) Water balance modeling of earthen final covers. J Geotech Geoenviron Eng 123(8):744–754
Khire MV, Benson CH, Bosscher PJ (2000) Capillary barriers: design variables and water balance. J Geotech Geoenviron Eng 126(8):695–708
Meerdink JS, Benson CH, Khire MV (1996) Unsaturated hydraulic conductivity of two compacted barrier soils. J Geotech Eng 122(7):565–576
Benson C, Gribb M (1997) Measuring unsaturated hydraulic conductivity in the laboratory and the field. Geotechnical Special Publication, Austin, pp 113–168
Fatt I (1956) The network model of porous media. Soc Petrol Eng 1956:207
Gostick J, Aghighi M, Hinebaugh J, Tranter T, Hoeh MA, Day H, Spellacy B, Sharqawy MH, Bazylak A, Burns A, Lehnert W (2016) OpenPNM: a pore network modeling package. Comput Sci Eng 18(4):60–74
Gostick JT, Ioannidis MA, Fowler MW, Pritzker MD (2007) Pore network modeling of fibrous gas diffusion layers for polymer electrolyte membrane fuel cells. J Power Sources 173(1):277–290
Sutera SP, Skalak R (1993) The history of Poiseuille’s law. Annu Rev Fluid Mech 25(1):1–20
Jang J, Narsilio GA, Santamarina JC (2011) Hydraulic conductivity in spatially varying media—a pore-scale investigation. Geophys J Int 184(3):1167–1179
Adamson AW, Gast AP (1967) Physical chemistry of surfaces, 6th edn. Wiley, Hoboken
Phadnis HS, Santamarina JC (2011) Bacteria in sediments: pore size effects. Geotech Lett 1(4):91–93
Acknowledgements
The authors acknowledge financial support from the National Science Fund for Distinguished Young Scholars (No. 51625805) and program of China Scholarships Council (No. 201706320096).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Li, G., Zhan, L., Dai, S. (2019). Influence of Pore Distribution Characteristics on Relative Hydraulic Conductivity in Soil Covers—A Pore-Scale Numerical Investigation. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2224-2_42
Download citation
DOI: https://doi.org/10.1007/978-981-13-2224-2_42
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-2223-5
Online ISBN: 978-981-13-2224-2
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)