Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect
In order to evaluate the performance of deep geological disposal of radioactive waste, an underground research laboratory (URL) was constructed by Andra in the Callovo-Oxfordian (COx) claystone formation at the Meuse/Haute-Marne (MHM). The construction of URL induced the excavation damage of host fo...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775523002469 |
| _version_ | 1797351568713973760 |
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| author | Hao Wang Yu-Jun Cui Minh Ngoc Vu Jean Talandier |
| author_facet | Hao Wang Yu-Jun Cui Minh Ngoc Vu Jean Talandier |
| author_sort | Hao Wang |
| collection | DOAJ |
| description | In order to evaluate the performance of deep geological disposal of radioactive waste, an underground research laboratory (URL) was constructed by Andra in the Callovo-Oxfordian (COx) claystone formation at the Meuse/Haute-Marne (MHM). The construction of URL induced the excavation damage of host formations, and the ventilation in the galleries desaturated the host formation close to the gallery wall. Moreover, it is expected that the mechanical behaviour of COx claystone is time-dependent. This study presents a constitutive model developed to describe the viscoplastic behaviour of unsaturated and damaged COx claystone. In this model, the unsaturation effect is considered by adopting the Bishop effective stress and the van Genuchten (VG) water retention model. In terms of the viscoplastic behaviour, the nonstationary flow surface (NSFS) theory for unsaturated soils is used with consideration of the coupled effects of strain rate and suction on the yield stress. A progressive hardening law is adopted. Meanwhile, a non-associated flow rule is used, which is similar to that in Barcelona basic model (BBM). In addition, to describe the damage effect induced by suction change and viscoplastic loading, a damage function is defined based on the crack volume proportion. This damage function contains two variables: unsaturated effective stress and viscoplastic volumetric strain, with the related parameters determined based on the mercury intrusion porosimetry (MIP) tests. For the model validation, different tests on COx claystone under different loading paths are simulated. Comparisons between experimental and simulated results indicated that the present model is able to well describe the viscoplastic behaviour of damaged COx claystone, including swelling/shrinkage, triaxial extension and compression, and triaxial creep. |
| first_indexed | 2024-03-08T13:02:21Z |
| format | Article |
| id | doaj.art-8e37e40a00d84d6d89bc7ab0dc196520 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-03-08T13:02:21Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-8e37e40a00d84d6d89bc7ab0dc1965202024-01-19T04:55:17ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552024-01-01161303316Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effectHao Wang0Yu-Jun Cui1Minh Ngoc Vu2Jean Talandier3Ecole des Ponts ParisTech, Laboratoire Navier/CERMES, 6 et 8 avenue Blaise Pascal, Marne La Vallée cedex 2, 77455, France; Corresponding author.Ecole des Ponts ParisTech, Laboratoire Navier/CERMES, 6 et 8 avenue Blaise Pascal, Marne La Vallée cedex 2, 77455, FranceAndra, R&D Department, Châtenay-Malabry, 92290, FranceAndra, R&D Department, Châtenay-Malabry, 92290, FranceIn order to evaluate the performance of deep geological disposal of radioactive waste, an underground research laboratory (URL) was constructed by Andra in the Callovo-Oxfordian (COx) claystone formation at the Meuse/Haute-Marne (MHM). The construction of URL induced the excavation damage of host formations, and the ventilation in the galleries desaturated the host formation close to the gallery wall. Moreover, it is expected that the mechanical behaviour of COx claystone is time-dependent. This study presents a constitutive model developed to describe the viscoplastic behaviour of unsaturated and damaged COx claystone. In this model, the unsaturation effect is considered by adopting the Bishop effective stress and the van Genuchten (VG) water retention model. In terms of the viscoplastic behaviour, the nonstationary flow surface (NSFS) theory for unsaturated soils is used with consideration of the coupled effects of strain rate and suction on the yield stress. A progressive hardening law is adopted. Meanwhile, a non-associated flow rule is used, which is similar to that in Barcelona basic model (BBM). In addition, to describe the damage effect induced by suction change and viscoplastic loading, a damage function is defined based on the crack volume proportion. This damage function contains two variables: unsaturated effective stress and viscoplastic volumetric strain, with the related parameters determined based on the mercury intrusion porosimetry (MIP) tests. For the model validation, different tests on COx claystone under different loading paths are simulated. Comparisons between experimental and simulated results indicated that the present model is able to well describe the viscoplastic behaviour of damaged COx claystone, including swelling/shrinkage, triaxial extension and compression, and triaxial creep.http://www.sciencedirect.com/science/article/pii/S1674775523002469Callovo-Oxfordian (COx) claystoneExcavation damageTime-dependent behaviourSuctionViscoplastic model |
| spellingShingle | Hao Wang Yu-Jun Cui Minh Ngoc Vu Jean Talandier Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect Journal of Rock Mechanics and Geotechnical Engineering Callovo-Oxfordian (COx) claystone Excavation damage Time-dependent behaviour Suction Viscoplastic model |
| title | Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect |
| title_full | Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect |
| title_fullStr | Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect |
| title_full_unstemmed | Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect |
| title_short | Modelling the viscoplastic behaviour of Callovo-Oxfordian claystone with consideration of damage effect |
| title_sort | modelling the viscoplastic behaviour of callovo oxfordian claystone with consideration of damage effect |
| topic | Callovo-Oxfordian (COx) claystone Excavation damage Time-dependent behaviour Suction Viscoplastic model |
| url | http://www.sciencedirect.com/science/article/pii/S1674775523002469 |
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