A constitutive model for the hydro-chemo-mechanical behaviour of chalk

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The mechanical properties of soft, highly porous carbonate rocks are known to be significantly affected by water saturation: both stiffness and strength decrease for wetting in the short term and for chemical dissolution in the long term. Both processes mainly affect the bonds between the carbonate grains: immediately after inundation depositional bonds fall into suspension whereas diagenetic bonds dissolve more slowly. In this work a strain hardening hydro – chemo - mechanical coupled elasto-plastic constitutive model for soft carbonate rocks is presented. The concept of extended hardening rules is here enriched: weathering functions are determined by employing a micro to macro simple upscaling procedures. Chemical damage is introduced in the formulation by means of a scalar damage function and its temporal evolution is also described using a multiscale approach. A new term is added to the strain rate decomposition tensor in order to incorporate the dissolution induced chemical deformations developing once the soft rock is turned into a granular material. The reference material is chalk from Butser Hill in Hampshire. After calibration, the model is validated by performing finite element simulations of rigid footing experiments from literature.
LanguageEnglish
Title of host publicationEngineering in Chalk
Subtitle of host publicationProceedings of the Chalk 2018 Conference
EditorsJ. A. Lawrence, M. Preene, U. L. Lawrence, R. Buckley
Place of PublicationLondon
PublisherICE Publishing
Pages275-282
Number of pages8
ISBN (Electronic)9780727764089
ISBN (Print)9780727764072
DOIs
Publication statusPublished - 2018
EventEngineering in Chalk 2018 International Conference - Imperial College London, London, United Kingdom
Duration: 17 Sep 201819 Sep 2018
https://www.chalk2018.org/about/committees

Conference

ConferenceEngineering in Chalk 2018 International Conference
CountryUnited Kingdom
CityLondon
Period17/09/1819/09/18
Internet address

Fingerprint

chalk
soft rock
hardening
carbonate rock
dissolution
damage
upscaling
footing
temporal evolution
strain rate
wetting
stiffness
mechanical property
weathering
plastic
saturation
decomposition
calibration
carbonate
simulation

Cite this

Ciantia, M. (2018). A constitutive model for the hydro-chemo-mechanical behaviour of chalk. In J. A. Lawrence, M. Preene, U. L. Lawrence, & R. Buckley (Eds.), Engineering in Chalk: Proceedings of the Chalk 2018 Conference (pp. 275-282). London: ICE Publishing. https://doi.org/10.1680/eiccf.64072.275
Ciantia, Matteo. / A constitutive model for the hydro-chemo-mechanical behaviour of chalk. Engineering in Chalk: Proceedings of the Chalk 2018 Conference. editor / J. A. Lawrence ; M. Preene ; U. L. Lawrence ; R. Buckley. London : ICE Publishing, 2018. pp. 275-282
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abstract = "The mechanical properties of soft, highly porous carbonate rocks are known to be significantly affected by water saturation: both stiffness and strength decrease for wetting in the short term and for chemical dissolution in the long term. Both processes mainly affect the bonds between the carbonate grains: immediately after inundation depositional bonds fall into suspension whereas diagenetic bonds dissolve more slowly. In this work a strain hardening hydro – chemo - mechanical coupled elasto-plastic constitutive model for soft carbonate rocks is presented. The concept of extended hardening rules is here enriched: weathering functions are determined by employing a micro to macro simple upscaling procedures. Chemical damage is introduced in the formulation by means of a scalar damage function and its temporal evolution is also described using a multiscale approach. A new term is added to the strain rate decomposition tensor in order to incorporate the dissolution induced chemical deformations developing once the soft rock is turned into a granular material. The reference material is chalk from Butser Hill in Hampshire. After calibration, the model is validated by performing finite element simulations of rigid footing experiments from literature.",
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Ciantia, M 2018, A constitutive model for the hydro-chemo-mechanical behaviour of chalk. in JA Lawrence, M Preene, UL Lawrence & R Buckley (eds), Engineering in Chalk: Proceedings of the Chalk 2018 Conference. ICE Publishing, London, pp. 275-282, Engineering in Chalk 2018 International Conference, London, United Kingdom, 17/09/18. https://doi.org/10.1680/eiccf.64072.275

A constitutive model for the hydro-chemo-mechanical behaviour of chalk. / Ciantia, Matteo.

Engineering in Chalk: Proceedings of the Chalk 2018 Conference. ed. / J. A. Lawrence; M. Preene; U. L. Lawrence; R. Buckley. London : ICE Publishing, 2018. p. 275-282.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - The mechanical properties of soft, highly porous carbonate rocks are known to be significantly affected by water saturation: both stiffness and strength decrease for wetting in the short term and for chemical dissolution in the long term. Both processes mainly affect the bonds between the carbonate grains: immediately after inundation depositional bonds fall into suspension whereas diagenetic bonds dissolve more slowly. In this work a strain hardening hydro – chemo - mechanical coupled elasto-plastic constitutive model for soft carbonate rocks is presented. The concept of extended hardening rules is here enriched: weathering functions are determined by employing a micro to macro simple upscaling procedures. Chemical damage is introduced in the formulation by means of a scalar damage function and its temporal evolution is also described using a multiscale approach. A new term is added to the strain rate decomposition tensor in order to incorporate the dissolution induced chemical deformations developing once the soft rock is turned into a granular material. The reference material is chalk from Butser Hill in Hampshire. After calibration, the model is validated by performing finite element simulations of rigid footing experiments from literature.

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Ciantia M. A constitutive model for the hydro-chemo-mechanical behaviour of chalk. In Lawrence JA, Preene M, Lawrence UL, Buckley R, editors, Engineering in Chalk: Proceedings of the Chalk 2018 Conference. London: ICE Publishing. 2018. p. 275-282 https://doi.org/10.1680/eiccf.64072.275