Constitutive Modeling for Biocemented Calcareous Sands
Publication: International Journal of Geomechanics
Volume 24, Issue 8
Abstract
Microbially induced calcite precipitation is an environment-friendly method for improving stiffness, strength, and dilatancy of loose or weak soils. Although many experimental studies have been performed on biocemented sands, few efforts have been devoted to establishing constitutive models for such materials. A critical-state-based bounding-surface model for biocemented sands was proposed in this research. An exponential equation of the plastic deviatoric strain was used to describe the degradation in a biocemented bond. The established model was applied to predict the drained triaxial test results of biocemented calcareous sands at different confining pressures and biocementation levels. We found that the current proposed biocemented model can well predict the softening and dilation of biocemented calcareous sands.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published paper. The detailed derivation process on the degradation mechanism of biocements, the unit loading vector, the state-dependent dilatancy equation, the unit vector related to the state-dependent dilatancy equation, and the plastic modulus are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant nos. 41831282, 52078085, and 51922024) and the Natural Science Foundation of Chongqing, China (Grant no. cstc2019jcyjjqX0014). The authors thank Dr. L. Liu for providing the experimental data. The authors also thank Mr. B.Y. Wu, Mr. Q.Y. Fang, Mr. H. Zhao, and Mr. F. Liang for the suggestions provided during the theoretical derivation.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 24 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Apr 6, 2023
Accepted: Mar 25, 2024
Published online: Jun 10, 2024
Published in print: Aug 1, 2024
Discussion open until: Nov 10, 2024
ASCE Technical Topics:
- Calcareous soils
- Cement
- Concrete
- Constitutive relations
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Materials engineering
- Mathematics
- Microbes
- Organisms
- Soil dilatancy
- Soil mechanics
- Soil properties
- Soil strength
- Soils (by type)
- Tests (by type)
- Triaxial tests
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