New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
Constitutive coupled modeling has developed rapidly in recent decades, with numerous new models published. However, few models consider dynamic porosity, and experimental validation of such a model remains a challenge due to multiple variables. In this study, a new constitutive model for unsaturated soil with dynamic porosity was developed based on mixture theory and nonequilibrium thermodynamics, then the model was validated using test data from two experimental studies that yielded good results (relative average error AVRE = 0.8631–1.3046, R2 = 0.9028–0.9981). The sensitivity of the model to the four primary parameters was analyzed to investigate the influence of model properties on the hydraulic and mechanical behavior. Results show that the calculation of volumetric strain is most sensitive to Young’s modulus (E), while the calculation of specific water volume is most sensitive to permeability (k). In addition, the sensitivity of the parameters changes with their value. Modeled results show that the porosity change significantly affects both hydraulic and mechanical behavior, even when soil undergoes relatively low deformation. Relative calculation error decreases notably after porosity change is considered (44.9% and 35.2% improvement in two different calculations). This study also finds that dynamic porosity affects the deformation energy of solids.
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Acknowledgments
This study was supported by the National Key R&D Program of China (No. 2019YFC1805503), the National Key R&D Program of China (No. 2018YFC1800905) and the Key Science and Technology Projects of the Inner Mongolia Autonomous Region (2019ZD001).
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 22 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 13, 2022
Accepted: May 14, 2022
Published online: Jul 25, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 25, 2022
ASCE Technical Topics:
- Coupling
- Dynamic models
- Engineering fundamentals
- Errors (statistics)
- Geomechanics
- Geotechnical engineering
- Hydraulic models
- Hydrologic models
- Material mechanics
- Material properties
- Materials engineering
- Mathematics
- Methodology (by type)
- Models (by type)
- Porosity
- Research methods (by type)
- Soil dynamics
- Soil mechanics
- Statistics
- Structural engineering
- Structural members
- Structural systems
- Validation
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