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Mechanical behaviour of low–medium density destructured White Chalk

Mechanical behaviour of low–medium density destructured White Chalk
Mechanical behaviour of low–medium density destructured White Chalk
Low- and medium-density White Chalk often destructures during civil engineering works, forming a putty that exhibits problematic low strengths in the short term but may build-up strength with time. The underlying mechanisms that control the mechanical performance of the material are not well understood. This paper explores the prospect of developing a framework to characterise the behaviour of chalk putty. To this end, triaxial tests were carried out using low- and medium-density reconstituted chalks produced by different methods. Using void ratio against mean effective stress results, a unique critical state line (CSL) is proposed, regardless of parent rock origin or the crushing process used to generate the putty material. The CSL was also found to satisfactorily fit independent test data by various authors, even though each independent sample material may have had different ‘intrinsic’ CSLs. This was suggested to stem from the similar particle characteristics of the chalks used. An assessment of the ageing effect indicates increases in strength as a result of densification due to consolidation and secondary compression, however, the end-of-test state could still be described using the CSL.
calcareous soils, chalk, shear strength
360-366
Alvarez Borges, Fernando Jesus
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Madhusudhan, BN
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e
Alvarez Borges, Fernando Jesus
9d9257b8-7421-4fd2-b4e8-adef24abeeee
Madhusudhan, BN
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e

Alvarez Borges, Fernando Jesus, Madhusudhan, BN and Richards, David (2020) Mechanical behaviour of low–medium density destructured White Chalk. Géotechnique Letters, 10 (2), 360-366, [jgele.20.00009]. (doi:10.1680/jgele.20.00009).

Record type: Article

Abstract

Low- and medium-density White Chalk often destructures during civil engineering works, forming a putty that exhibits problematic low strengths in the short term but may build-up strength with time. The underlying mechanisms that control the mechanical performance of the material are not well understood. This paper explores the prospect of developing a framework to characterise the behaviour of chalk putty. To this end, triaxial tests were carried out using low- and medium-density reconstituted chalks produced by different methods. Using void ratio against mean effective stress results, a unique critical state line (CSL) is proposed, regardless of parent rock origin or the crushing process used to generate the putty material. The CSL was also found to satisfactorily fit independent test data by various authors, even though each independent sample material may have had different ‘intrinsic’ CSLs. This was suggested to stem from the similar particle characteristics of the chalks used. An assessment of the ageing effect indicates increases in strength as a result of densification due to consolidation and secondary compression, however, the end-of-test state could still be described using the CSL.

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e-pub ahead of print date: 27 April 2020
Published date: June 2020
Keywords: calcareous soils, chalk, shear strength

Identifiers

Local EPrints ID: 441274
URI: http://eprints.soton.ac.uk/id/eprint/441274
PURE UUID: a7cf4b89-2845-4be0-a429-5881ea90490a
ORCID for Fernando Jesus Alvarez Borges: ORCID iD orcid.org/0000-0002-6940-9918
ORCID for BN Madhusudhan: ORCID iD orcid.org/0000-0002-2570-5934

Catalogue record

Date deposited: 08 Jun 2020 16:31
Last modified: 18 Feb 2021 17:23

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