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Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples

Author

Listed:
  • Xudong Zhang

    (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Yiming Zhu

    (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Zhanfeng Ying

    (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

  • Tingting Luo

    (Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China)

Abstract

Studying the strength and deformation properties of sediments containing gas hydrates is one of the key problems during the process of hydrate resource exploitation. In this paper, considering the effects of temperatures (−5, −3, −1 °C), confining pressures (0.5, 1, 2 MPa) and porosities (40%, 80%) on the dynamic modulus characteristics of sediments containing methane hydrates, several dynamic loading experiments were conducted. The results show that the sediment structure was more easily destroyed under a larger amplitude of dynamic loading. According to the dynamic stress–strain curves, the skeleton curves of the sediment samples were obtained, and it was shown that the deformation behaved with elastic characteristics in the initial stage, and then plastic deformation increased gradually and played a leading role with the increase in external loading. The maximum dynamic elastic modulus of sediments was reduced under the conditions of higher temperature and porosity, and effectively enhanced under higher confining pressure. Finally, on the basis of the Hardin–Drnevich equivalent model, and considering the influences of temperatures and confining pressures on model parameters, a viscoelastic constitutive model applied to analyze the dynamic modulus characteristics of sediments containing methane hydrate was established. The comparison showed that these calculated values of sediments’ dynamic elastic modulus accorded quite well with the experimental values.

Suggested Citation

  • Xudong Zhang & Yiming Zhu & Zhanfeng Ying & Tingting Luo, 2019. "Experimental Investigation on the Dynamic Modulus Properties of Methane Hydrate Sediment Samples," Energies, MDPI, vol. 12(22), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:22:p:4277-:d:285394
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    References listed on IDEAS

    as
    1. Yanghui Li & Yongchen Song & Weiguo Liu & Feng Yu, 2012. "Experimental Research on the Mechanical Properties of Methane Hydrate-Ice Mixtures," Energies, MDPI, vol. 5(2), pages 1-12, January.
    2. Li, Yanghui & Liu, Weiguo & Zhu, Yiming & Chen, Yunfei & Song, Yongchen & Li, Qingping, 2016. "Mechanical behaviors of permafrost-associated methane hydrate-bearing sediments under different mining methods," Applied Energy, Elsevier, vol. 162(C), pages 1627-1632.
    3. Yang, Lei & Ai, Li & Xue, Kaihua & Ling, Zheng & Li, Yanghui, 2018. "Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation," Energy, Elsevier, vol. 163(C), pages 27-37.
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