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Stiffness of destructured weak carbonate rock

Stiffness of destructured weak carbonate rock
Stiffness of destructured weak carbonate rock
The stiffness of destructured chalk, a silt-sized soft biomicrite, has been investigated using undrained triaxial tests equipped with bender elements (BE). The effects of potential fabric anisotropy on the BE-measured vertical small strain shear modulus (Gv0) has been assessed by testing remoulded material produced from parent chalks of different characteristics, and by reconstituting specimens at different moisture contents. The role of stress-induced anisotropy has been evaluated by consolidating specimens in either isotropic or one-dimensional conditions. Results revealed that the mean effective stress (p′) is the dominant parameter affecting Gv0, potentially due to the limited role of grain rearrangement and breakage during first-loading compression of fine-sized granular materials. Moderate effects on Gv0 were associated with inherent and induced anisotropy. At larger strains, stiffness degradation was found to be markedly non-linear, and degradation rates were most affected by the state of the material.
Stiffness, weak rocks, Chalk, Carbonate rocks
2297-0215
1-9
Birkhäuser
Alvarez-Borges, F. J.
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Bangalore Narasimha Murthy, Madhusudhan
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, D. J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Giovine, Pasquale
Mortara, Giuseppe
Mariano, Paolo Maria
Alvarez-Borges, F. J.
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Bangalore Narasimha Murthy, Madhusudhan
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, D. J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Giovine, Pasquale
Mortara, Giuseppe
Mariano, Paolo Maria

Alvarez-Borges, F. J., Bangalore Narasimha Murthy, Madhusudhan and Richards, D. J. (2018) Stiffness of destructured weak carbonate rock. Giovine, Pasquale, Mortara, Giuseppe and Mariano, Paolo Maria (eds.) In Micro to MACRO Mathematical Modelling in Soil Mechanics. Birkhäuser. pp. 1-9 . (doi:10.1007/978-3-319-99474-1_1).

Record type: Conference or Workshop Item (Paper)

Abstract

The stiffness of destructured chalk, a silt-sized soft biomicrite, has been investigated using undrained triaxial tests equipped with bender elements (BE). The effects of potential fabric anisotropy on the BE-measured vertical small strain shear modulus (Gv0) has been assessed by testing remoulded material produced from parent chalks of different characteristics, and by reconstituting specimens at different moisture contents. The role of stress-induced anisotropy has been evaluated by consolidating specimens in either isotropic or one-dimensional conditions. Results revealed that the mean effective stress (p′) is the dominant parameter affecting Gv0, potentially due to the limited role of grain rearrangement and breakage during first-loading compression of fine-sized granular materials. Moderate effects on Gv0 were associated with inherent and induced anisotropy. At larger strains, stiffness degradation was found to be markedly non-linear, and degradation rates were most affected by the state of the material.

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More information

Published date: 2018
Keywords: Stiffness, weak rocks, Chalk, Carbonate rocks

Identifiers

Local EPrints ID: 429686
URI: http://eprints.soton.ac.uk/id/eprint/429686
ISSN: 2297-0215
PURE UUID: 1f971460-7ae5-441d-8dee-1b799f256804
ORCID for F. J. Alvarez-Borges: ORCID iD orcid.org/0000-0002-6940-9918
ORCID for Madhusudhan Bangalore Narasimha Murthy: ORCID iD orcid.org/0000-0002-2570-5934

Catalogue record

Date deposited: 03 Apr 2019 16:30
Last modified: 04 Jun 2020 00:38

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Contributors

Author: F. J. Alvarez-Borges ORCID iD
Author: D. J. Richards
Editor: Pasquale Giovine
Editor: Giuseppe Mortara
Editor: Paolo Maria Mariano

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