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The 1D normal compression line and structure permitted space of low-medium density chalk

The 1D normal compression line and structure permitted space of low-medium density chalk
The 1D normal compression line and structure permitted space of low-medium density chalk
The one-dimensional (1D) normal compression behaviour of low–medium density chalk is investigated by way of high-pressure oedometer tests on intact and reconstituted specimens. Test results reveal that a single 1D normal compression line (NCL) exists for reconstituted chalks within the assessed density range, a feature that has not been reported previously. Laser diffraction particle-size analyses and scanning electron microscopy indicate that the ‘uniqueness’ of the NCL may be associated with comparable grain shapes and size distributions, and to grain breakage. These observations underscore the applicability of critical state concepts to describe the mechanical behaviour of reconstituted chalk. The compression paths of intact samples and the NCL for reconstituted chalk define an intact density-controlled structure-permitted space, which is used to estimate macroscopic bond strength. These calculations show that low-density intact chalk is far more reliant on cement bonds than medium density intact chalk to tolerate loading without exhibiting plastic straining. Therefore, the increase in intact strength observed with greater densities appears to result principally from stronger fabric, rather than stronger bonding.
298-304
Alvarez Borges, Fernando J.
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Madhusudhan, B.N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Alvarez Borges, Fernando J.
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Madhusudhan, B.N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e

Alvarez Borges, Fernando J., Madhusudhan, B.N. and Richards, David J. (2018) The 1D normal compression line and structure permitted space of low-medium density chalk. Géotechnique Letters, 8 (4), 298-304, [18-P-091R2]. (doi:10.1680/jgele.18.00091).

Record type: Article

Abstract

The one-dimensional (1D) normal compression behaviour of low–medium density chalk is investigated by way of high-pressure oedometer tests on intact and reconstituted specimens. Test results reveal that a single 1D normal compression line (NCL) exists for reconstituted chalks within the assessed density range, a feature that has not been reported previously. Laser diffraction particle-size analyses and scanning electron microscopy indicate that the ‘uniqueness’ of the NCL may be associated with comparable grain shapes and size distributions, and to grain breakage. These observations underscore the applicability of critical state concepts to describe the mechanical behaviour of reconstituted chalk. The compression paths of intact samples and the NCL for reconstituted chalk define an intact density-controlled structure-permitted space, which is used to estimate macroscopic bond strength. These calculations show that low-density intact chalk is far more reliant on cement bonds than medium density intact chalk to tolerate loading without exhibiting plastic straining. Therefore, the increase in intact strength observed with greater densities appears to result principally from stronger fabric, rather than stronger bonding.

Text
Alvarez-Borges, F. J. et al. (2018) Géotechnique Letters - Version of Record
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More information

Accepted/In Press date: 24 October 2018
e-pub ahead of print date: 31 October 2018
Published date: December 2018

Identifiers

Local EPrints ID: 427899
URI: http://eprints.soton.ac.uk/id/eprint/427899
PURE UUID: 12bc50ba-60b6-4d28-a2ef-0790f7275aba
ORCID for Fernando J. Alvarez Borges: ORCID iD orcid.org/0000-0002-6940-9918
ORCID for B.N. Madhusudhan: ORCID iD orcid.org/0000-0002-2570-5934

Catalogue record

Date deposited: 01 Feb 2019 17:30
Last modified: 07 Oct 2020 02:05

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