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Permeability Coefficient of Low Permeable Soils as a Single-Variable Function of Soil Parameter
Open AccessTechnical Note

Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil

by Bo Huang 1,2, Chang Guo 1,2, Yao Tang 1,2,*, Jiachen Guo 1,2 and Linfeng Cao 1,2
1
MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China
2
Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou, 310058, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(12), 2514; https://doi.org/10.3390/w11122514
Received: 12 November 2019 / Accepted: 26 November 2019 / Published: 28 November 2019
An accurate estimation of soil permeability is essential in geotechnical engineering. Transparent soil provides a promising experimental material to visualize pore-scale fluid flow, although the permeability characteristic of transparent soil remains unclear. As a result of the replacement of the fluid and solid phase, the permeability coefficient of transparent soil is usually several times or even more than ten times smaller than that of natural soil with the same particle size distribution and porosity. Fused quartz sand is used as the solid phase in this proposed transparent soil, which exhibits a similar mechanical behavior but different permeability to those of natural sand. Due to its low cost and eco-friendly characteristic, a mixture of mineral oil and aliphatic hydrocarbon is proposed as the liquid phase, which can achieve the same refractive index as the fused quartz sand after calculating the material proportion. Through a series of laboratory tests, the permeability of the transparent soil is obtained; the permeability is affected by the fluid dynamic viscosity, fluid density, particle size, particle size distribution, void ratio, and pore morphology. A hierarchical approach is introduced to quantitatively evaluate the effect of the particle shape on the permeability. Based on the experimental results, a modified Kozeny–Carman model is proposed for the prediction of transparent soil permeability, which can guide the preparation of transparent soil samples in further experimental studies.
Keywords: modified Kozeny–Carman model; particle size distribution; permeability; particle shape; transparent soil modified Kozeny–Carman model; particle size distribution; permeability; particle shape; transparent soil
MDPI and ACS Style

Huang, B.; Guo, C.; Tang, Y.; Guo, J.; Cao, L. Experimental Study on the Permeability Characteristic of Fused Quartz Sand and Mixed Oil as a Transparent Soil. Water 2019, 11, 2514.

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