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The effect of fabric on the behaviour of gold tailings

The effect of fabric on the behaviour of gold tailings
The effect of fabric on the behaviour of gold tailings
Undisturbed sampling of gold tailings, especially under the water table, is difficult and in many cases impossible. For this reason laboratory testing of tailings is generally conducted on reconstituted material. It has been shown that laboratory sample preparation methods can affect the mechanical behaviour of cohesionless soil and it is generally believed that the difference in mechanical behaviour is attributable to a difference in the fabric (particle arrangement) inherent in the preparation method. An experimental programme was conducted to (a) examine the fabric which ensues upon sample preparation and (b) to investigate the effect of any fabric differences on the mechanical behaviour of gold tailings. Comparison was made between the behaviour and fabric of undisturbed and reconstituted moist tamped and slurry deposited samples. The results from the experimental programme show that there is indeed a difference in fabric between undisturbed and reconstituted gold tailings samples. Slurry preparation generally replicates the fabric and behaviour of the undisturbed sample better than moist tamping, but neither fully replicates the undisturbed sample. At large strains, the samples reach a unique critical state friction angle, but at different stress states.

liquefaction, laboratory tests, stress path, microscopy, silts, stiffness, shear strength, fabric/structure of soils
0016-8505
187-197
Chang, N.
42b9208e-fda9-4293-a59c-d7bb29c87018
Heymann, G.
4f086d55-d1c1-48df-a1a3-b552571cb0d3
Clayton, C.
8397d691-b35b-4d3f-a6d8-40678f233869
Chang, N.
42b9208e-fda9-4293-a59c-d7bb29c87018
Heymann, G.
4f086d55-d1c1-48df-a1a3-b552571cb0d3
Clayton, C.
8397d691-b35b-4d3f-a6d8-40678f233869

Chang, N., Heymann, G. and Clayton, C. (2011) The effect of fabric on the behaviour of gold tailings. Geotechnique, 61 (3), 187-197.

Record type: Article

Abstract

Undisturbed sampling of gold tailings, especially under the water table, is difficult and in many cases impossible. For this reason laboratory testing of tailings is generally conducted on reconstituted material. It has been shown that laboratory sample preparation methods can affect the mechanical behaviour of cohesionless soil and it is generally believed that the difference in mechanical behaviour is attributable to a difference in the fabric (particle arrangement) inherent in the preparation method. An experimental programme was conducted to (a) examine the fabric which ensues upon sample preparation and (b) to investigate the effect of any fabric differences on the mechanical behaviour of gold tailings. Comparison was made between the behaviour and fabric of undisturbed and reconstituted moist tamped and slurry deposited samples. The results from the experimental programme show that there is indeed a difference in fabric between undisturbed and reconstituted gold tailings samples. Slurry preparation generally replicates the fabric and behaviour of the undisturbed sample better than moist tamping, but neither fully replicates the undisturbed sample. At large strains, the samples reach a unique critical state friction angle, but at different stress states.

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More information

Published date: July 2011
Keywords: liquefaction, laboratory tests, stress path, microscopy, silts, stiffness, shear strength, fabric/structure of soils
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 186033
URI: https://eprints.soton.ac.uk/id/eprint/186033
ISSN: 0016-8505
PURE UUID: 2235d241-fa2d-4d6e-92b9-03330fa458d1

Catalogue record

Date deposited: 11 May 2011 15:18
Last modified: 13 Aug 2017 07:16

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