Abstract
Research is being conducted on the geomechanical properties of methane hydrate bearing soil due to increasing global energy demands. Mechanical behaviors of MHBS are greatly influenced by the temperature and pore pressure and it can only exist under a condition of low temperature and high pressure. It is of great significance to investigate such influences for the safe exploration of methane hydrate. This paper presents a numerical approach to study the mechanical properties of pore-filling type of MHBS under the influences of temperature and pore pressure by conducting DEM drained triaxial compression tests. The results show as the temperature decreases or pore pressure increases, the strength and elastic modulus of MHBS gradually increase, and the volumetric response switches from contractive to dilative. The direction of the contact between the particles forwards a vertical deflection with the development of the axial strain. The evolution rule of deviator fabrics of the strong contact \(F_{{_{11} }}^{s} - F_{{_{33} }}^{s}\) is similar to that of stress ratio \(q/p\)-axial strain. The macro behavior changes along with the micro response.
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Acknowledgments
The research was funded by the National Natural Science Foundation of China with grant Nos. 51179128, 51579178, Project of State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, of China with grant No. SLDRCE14-A-04. All the supports are greatly appreciated.
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He, J., Jiang, M.J., Liu, J. (2017). Effect of Different Temperatures and Pore Pressures on Geomechanical Properties of Pore-Filling Type of Methane Hydrate Soils Based on the DEM Simulations. In: Li, X., Feng, Y., Mustoe, G. (eds) Proceedings of the 7th International Conference on Discrete Element Methods. DEM 2016. Springer Proceedings in Physics, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-10-1926-5_86
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DOI: https://doi.org/10.1007/978-981-10-1926-5_86
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