Shape factors of cylindrical permeameters

Silvestri, Vincenzo; Samra, Ghassan Abou; Bravo-Jonard, Christian

doi:10.12989/gae.2011.3.1.017

Cited by 1 publication

(1 citation statement)

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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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