Abstract
The occurrence habits and content of hydrates significantly impact the mechanical behavior of sediments. Therefore, the established constitutive model should reasonably describe the stress–strain relationship with the change in the hydrate content under different occurrence habits. In the framework of the unified hardening model, the effective degree of hydrate saturation, damage parameters, and hardening parameters of structural sand are introduced into the yield function to consider the occurrence habits and damage of cementation. A new elastoplastic constitutive model of gas hydrate-bearing sediments is established. The results show that the cementation is more evident with the effective hydrate content variations. Furthermore, with an increase in the load, the cementation is weakened and the strength decreases. In addition, the greater the effective degree of hydrate saturation, the more pronounced the strength decrease. A comparison of the model prediction with triaxial confining pressure test data shows that the proposed constitutive model can adequately describe the stress–strain relationship of sediments under different hydrate content and occurrence habits, which indicates the rationality of the presented model.
Article highlights
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(1)
An expression of cohesion considering the influence of hydrate occurrence habits and damage to hydrate cementation is proposed.
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(2)
The hardening parameter of the structural soil is used to modify the yield function so as to reflect the effects of the initial structure and structural damage.
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(3)
The proposed model can better describe the mechanical behavior of gas hydrate-bearing sediments.
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- UH:
-
Unified hardening model
- GHBS:
-
Gas hydrate-bearing sediments
- DEM:
-
Discrete element method
- CSUH:
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Unified hardening constitutive model of clay and sand
- NCL:
-
Normal consolidation curve
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant Nos. 51774018, 12172036), Program for Changjiang Scholars and Innovative Research Team in University (IRT_17R06), BUCEA Doctor Graduate Scientific Research Ability Improvement Project (Grant No. DG2021003), and the BUCEA Post-Graduate Innovation Project (Grant No. PG2021007).
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Wang, Z., Qi, C., Yu, H. et al. Elastoplastic constitutive model for gas hydrate bearing sediments considering hydrate occurrence habits. Geomech. Geophys. Geo-energ. Geo-resour. 8, 190 (2022). https://doi.org/10.1007/s40948-022-00494-z
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DOI: https://doi.org/10.1007/s40948-022-00494-z