THERMAL SCIENCE

International Scientific Journal

Tian-Xiang Ao

,

Ming-Zhong Gao

,

Zhao Le

,

Meng Xu

,

Yi-Kun Yang

,

Ming-Zhu Qi

PFC/FLAC 3-D COUPLED FLEXIBILITY FOR NATURAL GAS HYDRATE NUMERICAL SIMULATION TRIAXIAL EXPERIMENTAL STUDY

ABSTRACT
In this study, based on the PFC-FLAC discrete-continuous coupled analysis method, we constructed a model of gas hydrate-bearing sediments (GHBS) and conducted triaxial compression numerical simulation experiments. The results show that high confining pressure (>5 MPa) destroys the cementation of hydrate, and the stiffness of GHBS specimens increases with increasing confining pressure. The strength and stiffness of highly saturated (>40%) GHBS specimens increase with the increase of saturation, but the destructive brittleness increases as well. In terms of microscopic contact force, the enclosing pressure effect inhibits the particle motion and the GHBS specimens show anisotropy after loading damage. The results of this study contribute to a better understanding and prediction of the macroscopic and microscopic mechanical properties of gas hydrate sediments, which is of great significance for the safe and efficient exploitation of gas hydrates.
KEYWORDS
natural gas hydrate, triaxial compression test, numerical model
PUBLISHED ONLINE: 2025-06-01
DOI REFERENCE: https://doi.org/10.2298/TSCI2502345A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 2, PAGES [1345 - 1350]
REFERENCES
  1. Li, F., et al., Formation Mechanism of Core Discing During Drilling Under Deep In-Situ Stress Environment: Numerical Simulation And Laboratory Testing, Journal of Central South University, 30 (2023), 10, pp. 3303-3321
  2. Yang, Y. K., et al., Laboratory Simulation of Natural Gas Hydrate Formation and Low Disturbance Drilling, Thermal Science, 28 (2024), 4B, pp. 3547-3552
  3. Miyazaki, K., et al., Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment, Journal of Geophysical Research-Solid Earth, 116 (2011), IDB06102
  4. Hyodo, M., et al., Mechanical and Dissociation Properties of Methane Hydrate-Bearing Sand in Deep Seabed, Soils and Foundations, 53 (2013), 2, pp. 299-314
  5. Kajiyama, S., et al., Experimental Investigation on the Mechanical Properties of Methane Hydrate-Bearing Sand Formed with Rounded Particles, Journal of Natural Gas Science and Engineering, 45 (2017), Sept., pp. 96-107
  6. Jiang, M. J., et al., The DEM Analysis of Geomechanical Properties of Cemented Methane Hydrate-Bearing Soils at Different Temperatures and Pressures, International Journal of Geomechanics, 16 (2016), 3, ID04015087
  7. Jiang, M. J., et al., Study of Mechanical Behavior and Strain Localization of Methane Hydrate Bearing Sediments with Different Saturations by a New DEM Model, Computers and Geotechnics, 57 (2014), Apr., pp. 122-138
  8. You, Z. S., et al., A Numerical Investigation on the Mechanical Properties of Hydrate-Bearing Sand Using Distinct Element Method, Journal of Natural Gas Science and Engineering, 96 (2021), ID104328
  9. Dou, X. F., et al., The 3-D DEM Modelling on Mechanical Weakening of Gas Hydrate-Bearing Sandy Sediments During Hydrate Dissociation, Computers and Geotechnics, 154 (2023), 17, ID105116
  10. Brugada, J., et al., Discrete Element Modelling of Geomechanical Behaviour of Methane Hydrate Soils with Pore-Filling Hydrate Distribution, Granular Matter, 12 (2010), 5, pp. 517-525
  11. Wang, N. N., et al., Macro-Micro Mechanical Behavior Research on Gas Hydrate Bearing Coal Based on Parallel Bonding Model, Journal of China Coal Society, 49 (2024), S1, pp. 314-326
  12. Tizpa, P., et al., The PFC/FLAC 3-D Coupled Numerical Modelling of Shallow Foundations Seated on Reinforced Granular Fill Overlying Clay with Square Void, Computers and Geotechnics, 161 (2023), ID105574
  13. Yan, R. T., et al., Constitutive Model for Gas Hydrate-Bearing Soils Considering Hydrate Occurrence Habits, International Journal of Geomechanics, 17 (2017), 8, ID04017032
  14. Gou, H., et al., Numerical Analysis of Perforated Symmetric Fissures on Mechanical Properties of Hole-Containing Sandstone, Applied Sciences-Basel, 13 (2023), 15, 16, ID8780
  15. De La Fuente, M., et al., Modelling Methane Hydrate Saturation in Pores: Capillary Inhibition Effects, Energies, 14 (2021), 18, ID5627
  16. Wei, D., et al., Estimation of Gas Hydrate Saturation Regarding the Hydrate Morphology in Hydrate-Bearing Sands in the Qiongdongnan Basin, South China Sea, Pure and Applied Geophysics, 180 (2023), 7, pp. 2757-2773
  17. Lee, Y., et al., Influence of CH4 Hydrate Exploitation Using Depressurization and Replacement Methods on Mechanical Strength of Hydrate-Bearing Sediment, Applied Energy, 277 (2020), ID115569
  18. Xu, Z. H., et al., A Parameter Calibration Method for PFC Simulation: Development and A Case Study of Limestone, Geomechanics and Engineering, 22 (2020), 1, pp. 97-108
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PFC/FLAC 3-D coupled flexibility for natural gas hydrate numerical simulation triaxial experimental study

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence