Title: Design criteria of protective filters based on particle shape and gradation parameters

Authors: Nasir Ahmad Rather; Mohd Akbar Lone; Abdul Qayoom Dar; Saeid Eslamian; Bintul Huda Mir; Bilal Ahmad Dar

Addresses: Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, 190006, India ' Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, 190006, India ' Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, 190006, India ' Department of Water Engineering, College of Agriculture, Isfahan University of Technology, 8415683111, Isfahan, Iran ' Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, 190006, India ' Department of Civil Engineering, National Institute of Technology, Srinagar, Jammu and Kashmir, 190006, India

Abstract: This study presents design criteria of protective filters for different shapes of filter material and subsequently the effect of shape parameters of filter particles on its design. The filter-base combination tests have been conducted in the laboratory for different shapes of filter material, i.e., elliptical, sub-rounded, irregular and elongated. The shape parameters considered in the study are sphericity, shape factor, flatness ratio and elongation ratio. It was observed that the design criteria varied with the shape of filter particles even if the gradation of the filter material was similar. The design criteria in the form of empirical equations have been developed on the basis of D₁₅ of filter mass, d₈₅ of base, permeability (k) of filter mass and shape parameters of filter mass.

Keywords: filter; shape; sphericity; shape factor; design criteria; permeability; gradation.

DOI: 10.1504/IJHST.2020.104990

International Journal of Hydrology Science and Technology, 2020 Vol.10 No.1, pp.102 - 122

Received: 04 Sep 2017
Accepted: 16 Mar 2018
Published online: 10 Feb 2020 *

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