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Small-strain shear stiffness of compacted bentonites for Engineering Barrier Systems

Small-strain shear stiffness of compacted bentonites for Engineering Barrier Systems
Small-strain shear stiffness of compacted bentonites for Engineering Barrier Systems
The shear modulus (G) of two different bentonites was measured by means of a resonant column apparatus. The samples were compacted at different dry densities and degrees of saturation and tested with different confinement pressures and strains levels for studying the influence of these parameters on the shear modulus. The results show similar tendencies in both bentonites: the shear modulus increases as the dry density increases and exhibits maximum shear modulus when degree of saturation is around 80%. An empirical equation, taking into account the microstructure of the clays, is used to evaluate the shear modulus at small strains as a function of dry density and degree of saturation. Although the values of the shear modulus measured are similar in both bentonites for a given stress and degree of saturation, there is difference in the elastic strain limit of the soil. Bentonite clay is going to be part of the Engineered Barrier System (EBS) in deep geological disposal facilities for the long-term confinement of spent nuclear fuel. In order to fully understand their long-term performance, their behaviour in shearing conditions should be assessed.
Resonant Column, Shear modulus, Engineered barrier systems, Suction, Effective degree of saturation, Macro structure
2352-3808
1-12
Pintado, X.
bff0eb56-80e4-43d3-b1d8-5415110b3872
Romero, E.
7d251d2e-c193-4e24-a809-a930209d8c2c
Suriol, J.
ce004803-81a0-44fa-9064-a2639e61e6f5
Lloret, A.
847ccf0b-e77b-4a31-abd8-37b8a9f44d53
Madhusudhan, B. N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Pintado, X.
bff0eb56-80e4-43d3-b1d8-5415110b3872
Romero, E.
7d251d2e-c193-4e24-a809-a930209d8c2c
Suriol, J.
ce004803-81a0-44fa-9064-a2639e61e6f5
Lloret, A.
847ccf0b-e77b-4a31-abd8-37b8a9f44d53
Madhusudhan, B. N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c

Pintado, X., Romero, E., Suriol, J., Lloret, A. and Madhusudhan, B. N. (2019) Small-strain shear stiffness of compacted bentonites for Engineering Barrier Systems. Geomechanics for Energy and the Environment, 18, 1-12. (doi:10.1016/j.gete.2018.12.001).

Record type: Article

Abstract

The shear modulus (G) of two different bentonites was measured by means of a resonant column apparatus. The samples were compacted at different dry densities and degrees of saturation and tested with different confinement pressures and strains levels for studying the influence of these parameters on the shear modulus. The results show similar tendencies in both bentonites: the shear modulus increases as the dry density increases and exhibits maximum shear modulus when degree of saturation is around 80%. An empirical equation, taking into account the microstructure of the clays, is used to evaluate the shear modulus at small strains as a function of dry density and degree of saturation. Although the values of the shear modulus measured are similar in both bentonites for a given stress and degree of saturation, there is difference in the elastic strain limit of the soil. Bentonite clay is going to be part of the Engineered Barrier System (EBS) in deep geological disposal facilities for the long-term confinement of spent nuclear fuel. In order to fully understand their long-term performance, their behaviour in shearing conditions should be assessed.

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Review-GETE_2017_60_XP - Accepted Manuscript
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Accepted/In Press date: 6 December 2018
e-pub ahead of print date: 11 December 2018
Published date: June 2019
Keywords: Resonant Column, Shear modulus, Engineered barrier systems, Suction, Effective degree of saturation, Macro structure

Identifiers

Local EPrints ID: 427359
URI: http://eprints.soton.ac.uk/id/eprint/427359
ISSN: 2352-3808
PURE UUID: 02329d56-1b55-4270-8368-5ee76cb37f13
ORCID for B. N. Madhusudhan: ORCID iD orcid.org/0000-0002-2570-5934

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Date deposited: 14 Jan 2019 17:30
Last modified: 07 Oct 2020 05:09

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