Details
| Original language | English |
|---|---|
| Journal | Journal of Rock Mechanics and Geotechnical Engineering |
| Early online date | 13 Dec 2023 |
| Publication status | E-pub ahead of print - 13 Dec 2023 |
Abstract
An elastoplastic constitutive model based on the Modified Cam Clay (MCC) model is developed to describe the mechanical behaviour of soils cemented via microbially induced calcite precipitation (MICP). It considers the increase of the elastic stiffness, the change of the yield surface due to MICP cementation and the degradation of calcium carbonate bonds during shearing. Specifically, to capture the typical contraction-dilation transition in MICP soils, the original volumetric hardening rule in the MCC model is modified to a combined deviatoric and volumetric hardening rule. The model could reproduce a series of drained triaxial tests on MICP-treated soils with different calcium carbonate contents. Further, we carry out a parametric study and observe numerical instability in some cases. In combination with an analytical analysis, our numerical modelling has identified the benefits and limitations of using MCC-based models in the simulation of MICP-cemented soils, leading to suggestions for further model development.
Keywords
- Contraction-dilation transition, Elastoplasticity, MFront, Microbially induced calcite precipitation (MICP), Modified cam clay (MCC), OpenGeoSys
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
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In: Journal of Rock Mechanics and Geotechnical Engineering, 13.12.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modelling of the elastoplastic behaviour of the bio-cemented soils using an extended Modified Cam Clay model
AU - Wang, Xuerui
AU - Silbermann, Christian B.
AU - Nagel, Thomas
AU - Nackenhorst, Udo
N1 - Funding Information: This research was funded by the German Research Foundation (DFG) (Grant No. NA 330/20–1). We thank the OpenGeoSys community and Thomas Helfer for support.
PY - 2023/12/13
Y1 - 2023/12/13
N2 - An elastoplastic constitutive model based on the Modified Cam Clay (MCC) model is developed to describe the mechanical behaviour of soils cemented via microbially induced calcite precipitation (MICP). It considers the increase of the elastic stiffness, the change of the yield surface due to MICP cementation and the degradation of calcium carbonate bonds during shearing. Specifically, to capture the typical contraction-dilation transition in MICP soils, the original volumetric hardening rule in the MCC model is modified to a combined deviatoric and volumetric hardening rule. The model could reproduce a series of drained triaxial tests on MICP-treated soils with different calcium carbonate contents. Further, we carry out a parametric study and observe numerical instability in some cases. In combination with an analytical analysis, our numerical modelling has identified the benefits and limitations of using MCC-based models in the simulation of MICP-cemented soils, leading to suggestions for further model development.
AB - An elastoplastic constitutive model based on the Modified Cam Clay (MCC) model is developed to describe the mechanical behaviour of soils cemented via microbially induced calcite precipitation (MICP). It considers the increase of the elastic stiffness, the change of the yield surface due to MICP cementation and the degradation of calcium carbonate bonds during shearing. Specifically, to capture the typical contraction-dilation transition in MICP soils, the original volumetric hardening rule in the MCC model is modified to a combined deviatoric and volumetric hardening rule. The model could reproduce a series of drained triaxial tests on MICP-treated soils with different calcium carbonate contents. Further, we carry out a parametric study and observe numerical instability in some cases. In combination with an analytical analysis, our numerical modelling has identified the benefits and limitations of using MCC-based models in the simulation of MICP-cemented soils, leading to suggestions for further model development.
KW - Contraction-dilation transition
KW - Elastoplasticity
KW - MFront
KW - Microbially induced calcite precipitation (MICP)
KW - Modified cam clay (MCC)
KW - OpenGeoSys
UR - http://www.scopus.com/inward/record.url?scp=85180585312&partnerID=8YFLogxK
U2 - 10.1016/j.jrmge.2023.09.015
DO - 10.1016/j.jrmge.2023.09.015
M3 - Article
AN - SCOPUS:85180585312
JO - Journal of Rock Mechanics and Geotechnical Engineering
JF - Journal of Rock Mechanics and Geotechnical Engineering
SN - 1674-7755
ER -