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

Matteo Ciantia

doi:10.1680/eiccf.64072.275

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

Matteo Ciantia (Lead / Corresponding author)

Civil Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 Citations (Scopus)

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.

Original language	English
Title of host publication	Engineering in Chalk
Subtitle of host publication	Proceedings of the Chalk 2018 Conference
Editors	J. A. Lawrence, M. Preene, U. L. Lawrence, R. Buckley
Place of Publication	London
Publisher	ICE Publishing
Pages	275-282
Number of pages	8
ISBN (Electronic)	9780727764089
ISBN (Print)	9780727764072
DOIs	https://doi.org/10.1680/eiccf.64072.275
Publication status	Published - 2018
Event	Engineering in Chalk 2018 International Conference - Imperial College London, London, United Kingdom Duration: 17 Sept 2018 → 19 Sept 2018 https://www.chalk2018.org/about/committees

Conference

Conference	Engineering in Chalk 2018 International Conference
Country/Territory	United Kingdom
City	London
Period	17/09/18 → 19/09/18
Internet address	https://www.chalk2018.org/about/committees

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10.1680/eiccf.64072.275

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title = "A constitutive model for the hydro-chemo-mechanical behaviour of chalk",

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.",

author = "Matteo Ciantia",

year = "2018",

doi = "10.1680/eiccf.64072.275",

language = "English",

isbn = "9780727764072",

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editor = "Lawrence, \{J. A.\} and M. Preene and Lawrence, \{U. L.\} and R. Buckley",

booktitle = "Engineering in Chalk",

publisher = "ICE Publishing ",

address = "United Kingdom",

note = "Engineering in Chalk 2018 International Conference ; Conference date: 17-09-2018 Through 19-09-2018",

url = "https://www.chalk2018.org/about/committees",

}

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 (Lead / Corresponding author).
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 proceeding › Conference contribution

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AU - Ciantia, Matteo

PY - 2018

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N2 - 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.

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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DO - 10.1680/eiccf.64072.275

M3 - Conference contribution

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SP - 275

EP - 282

BT - Engineering in Chalk

A2 - Lawrence, J. A.

A2 - Preene, M.

A2 - Lawrence, U. L.

A2 - Buckley, R.

PB - ICE Publishing

CY - London

T2 - Engineering in Chalk 2018 International Conference

Y2 - 17 September 2018 through 19 September 2018

ER -

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

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