Surface topographical analysis of geomembranes and sands using a 3D optical profilometer

Vangla, P and Latha, G M (2017) Surface topographical analysis of geomembranes and sands using a 3D optical profilometer. In: GEOSYNTHETICS INTERNATIONAL, 24 (2). pp. 151-166.

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Abstract

Understanding the stress-displacement response of granular materials and their interfaces with geosynthetics through surface topographical analysis is evolving as a new area of potential interest. Recent developments in optical techniques coupled with digital image recording have enabled the measurement of the surface topographical features of sand particles and geosynthetics, which can be applied to measure the shear-induced surface changes in geomembranes. This paper presents one of the latest, advanced surface measurement techniques based on coherence correlation interferometry using a 3D optical profilometer. An experimental technique was developed to measure the surface topography of sand particles, and the shear-induced surface changes in a smooth geomembrane caused by sand particles of different mean sizes, in interface direct shear tests. As the measured surfaces consisted of form andwaviness along with roughness, appropriate filters were applied to remove form andwaviness and measure the roughness of the surfaces. The selection of these filters for different cases and the spatial variability of surface roughness measurements are discussed. The results of the surface topographical analysis of sand particles of three different sizes, geomembranes sheared by sands of three different mean sizes, and their repeatability, are presented. The stress-displacement response of the sand-geomembrane interfaces is correlated to the surface changes on sheared geomembranes through visual observations and roughness quantifications.

Item Type:	Journal Article
Publication:	GEOSYNTHETICS INTERNATIONAL
Publisher:	ICE PUBLISHING, INST CIVIL ENGINEERS, 1 GREAT GEORGE ST, WESTMINISTER SW 1P 3AA, ENGLAND
Additional Information:	Copy right for this article belongs to the ICE PUBLISHING, INST CIVIL ENGINEERS, 1 GREAT GEORGE ST, WESTMINISTER SW 1P 3AA, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	20 May 2017 06:04
Last Modified:	20 May 2017 06:04
URI:	http://eprints.iisc.ac.in/id/eprint/56936

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