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Hydrodynamic behaviour of compacted granite sawdust from the dimension stone industry of Pontevedra (Spain): experimental and modelling

Falcon-Suarez, Ismael; Juncosa-Rivera, Ricardo; Vardon, Phil; Rammlmair, Dieter; Günter, Thomas; Noell, Ulla; Delgado-Martín, Jordi. 2016 Hydrodynamic behaviour of compacted granite sawdust from the dimension stone industry of Pontevedra (Spain): experimental and modelling. Environmental Earth Sciences, 75 (5), 421. 10.1007/s12665-015-5112-1

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© Springer Science+Business Media B.V. 2016 This document is the author’s final manuscript version of the journal article, incorporating any revisions agreed during the peer review process. Some differences between this and the publisher’s version remain. You are advised to consult the publisher’s version if you wish to cite from this article. The final publication is available at link.springer.com
FalconSuarez_etal_2016_finaldraf.pdf - Accepted Version

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Abstract/Summary

Two large-scale column experiments have been performed to test the hydrodynamic behaviour of unsaturated, compacted granite sawdust—a material produced during the dressing of dimension stone in Pontevedra (Spain). One of the columns was equipped with psychrometers and capacitance probes while, in the other, a radial array of 80 electrodes made possible a time-dependent 3D electrical resistivity survey. All these devices allowed investigating and modelling the progressive saturation of the material. The study includes a straightforward methodology developed to calibrate the resistivity signals based on standard Proctor-compacted specimens. The progressive saturation of the granite sawdust reveals different stages: initially, an uneven advance of the saturation front (fingering) occurs; later on, this feature vanishes and is replaced by a more regular advance of the saturation front. Numerical analysis of the results shows that the yield capacity of the granite sawdust is ~0.39 m3 m?3 and a saturated hydraulic conductivity ~2 × 10?6 m s?1. The latter, which corresponds to the specific standard Proctor compaction, is not sufficient to support the use of granite sawdust for compacted-single-layer capping structures. Nonetheless, increased compaction efforts or improved design criteria (multilayer systems or capillary barriers) can keep bearing when considering granite sawdust for this purpose.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s12665-015-5112-1
ISSN: 1866-6280
Additional Keywords: Sustainable waste management; Sanitary landfills; Unsaturated soil behaviour; Hydraulic conductivity; Yield capacity; Water fingering
Date made live: 05 May 2016 12:25 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513555

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