The role of particle shape on hydraulic conductivity of granular soils captured through Kozeny–Carman approach

Nguyên, Thanh Trung; Indraratna, Buddhima

doi:10.1680/jgele.20.00032

Cited by 27 publications

(8 citation statements)

References 17 publications

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“…Kozeny-Carman -or simply KC-formulations have been successfully employed to incorporate microstructural effects derived from particle shape in granular soils (e.g. Nguyen & Indraratna, 2020) or porosity distribution in compacted bentonite (Chen et al, 2020). Microstructural effects in KC might be implemented through tortuosity (e.g.…”

Section: Relation Of Permeability To Microstructural Featuresmentioning

confidence: 99%

The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete

et al. 2022

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An attractive approach to reduce the carbon footprint of deep soil mixing (DSM) is to replace Portland cement-based binders by geopolymers based on metakaolin. Safe design requires a good understanding of the mechanical and hydraulic properties of the improved ground but very little is known about metakaolin-soil mixtures. For instance, shrinkage during curing is a significant issue for metakaolin-based concretes but has not been previously studied in soilcretes. In this work the permeability and strength of sand and silty sand based metakaolin soilcretes are studied under different curing conditions. The development of microcracks induced by geopolymer shrinkage is confirmed through a microstructural study using mercury intrusion porosimetry, scanning electron microscopy and X-Ray computed tomography. The influence of microporosity and binder filling on permeability and strength is clarified adapting wellestablished soil models. A modified Kozeny-Carman formulation is proposed for permeability. A mixture ratio model is calibrated to represent strength. In general, the metakaolin stabilised materials present excellent mechanical and hydraulic properties, although these are very sensitive to curing conditions.

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Section: Relation Of Permeability To Microstructural Featuresmentioning

confidence: 99%

The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete

et al. 2022

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“…The influence of the grain shape on the permeability values, considering the two differentiated characteristics of sphericity and angularity, was addressed almost a century ago (Fair and Hatch 1933). Classical values of the shape factor α are 1.1 for rounded sands, 1.25 for medium angularity sands, and 1.4 for angular sands (Loudon 1952), but new values and analytical solutions are being proposed (Silvestri et al 2011;Nomura et al 2018;Nguyen and Indraratna 2020). Although this factor should be considered in drainage calculations for crushing quarry waste, as a function of the obvious differences in grain shape with regard to aggregates from gravel pits, the shape factor is not addressed in this study.…”

Section: Estimate Permeability From Granulometric Datamentioning

confidence: 99%

New granulometric expressions for estimating permeability of granular drainages

Díaz-Curiel

Miguel²,

Biosca

et al. 2022

Bull Eng Geol Environ

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This paper describes a new formulation for estimating the permeability of drainages composed of natural sands with no clay content, starting from the parameters obtained from the grain size distribution. The conventional relationships for estimating permeability are functions of granulometric factors and porosity. However, for media typically used as drainage, the grain size grading is a determinant factor, so the porosity dependence can be replaced by a function of the average grain size and grading. The methodology used in this study consists of fitting a set of measured permeability values to a joint expression of the average grain size and the granulometric grading coefficient. To this end, a new effective diameter that can be obtained numerically and graphically is defined, and the permeability relationship is solely dependent on this diameter. To estimate later changes in drainage packing and the consequent variations in porosity, a contrasting modification of the Kozeny–Carman equation is established. This equation considers the grain size grading and is applicable to any granular media.

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“…The KC equation shows good performance in predicting the permeability of porous media. A large number of scholars have successfully applied the KC equation to the prediction of the permeability of coarse-grained soil [14][15][16]. Recently, some scholars have extended the scope of application to the permeability prediction of fine-grained soil by substituting the effective porosity into the KC equation [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A New Modified Model of the Streaming Potential Coupling Coefficient Depends on Structural Parameters of Soil-Rock Mixture

2021

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The streaming potential effect in soil-rock mixture (SRM) is related to the compactness and rock content, but there is no model to quantitatively describe this behavior. In this paper, the Kozeny–Carman (KC) equation is modified by using the compactness and rock content. Then, the modified KC equation is substituted into the equation of streaming potential coupling coefficient. A new modified model of streaming potential coupling coefficient that depends on the compactness, rock content, particle shape, and particle gradation is proposed. The reliability of the new modified model is tested by experiments, and the applicable scope of the model is obtained. The results show that when the rock content is 30%, the permeability coefficient prediction accuracy of the modified KC equation is higher in the range of 85–95% compactness. The new modified model of the streaming potential coupling coefficient represents well the control of the compactness (75–95%) on the coupling coefficient. When the compactness remains 85%, the permeability coefficient calculated by the modified KC equation in the range of 10–70% rock content is consistent with the experimental data. The influence of the rock content (10–90%) on the coupling coefficient is well described by the new modified model of the streaming potential coupling coefficient. The new modified model of streaming potential coupling coefficient is helpful to quantitatively evaluate the internal structure evolution of embankment dam by using streaming potential phenomenon.

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The role of particle shape on hydraulic conductivity of granular soils captured through Kozeny–Carman approach

Cited by 27 publications

References 17 publications

The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete

The effect of curing conditions on the hydromechanical properties of a metakaolin-based soilcrete

New granulometric expressions for estimating permeability of granular drainages

A New Modified Model of the Streaming Potential Coupling Coefficient Depends on Structural Parameters of Soil-Rock Mixture

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