Volume 38 Issue 3
Jun.  2024
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2024  >  38(3): 263-272
Jiang Kaisong, Qi Chengzhi, Lu Chunsheng, Wang Zefan, Zhang Yujia. Elastic-plastic Constitutive Model Considering Structural Effects of Deep-sea Energy Soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(3): 263-272. doi: 10.3969/j.issn.1007-2993.2024.03.002
Citation: Jiang Kaisong, Qi Chengzhi, Lu Chunsheng, Wang Zefan, Zhang Yujia. Elastic-plastic Constitutive Model Considering Structural Effects of Deep-sea Energy Soil[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2024, 38(3): 263-272. doi: 10.3969/j.issn.1007-2993.2024.03.002
shu

Elastic-plastic Constitutive Model Considering Structural Effects of Deep-sea Energy Soil

doi: 10.3969/j.issn.1007-2993.2024.03.002
  • 1.

    Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • 2.

    Beijing International Cooperation Base for Urban Transportation Infrastructure Construction, Beijing 100044, China

  • 3.

    School of Civil and Mechanical Engineering, Curtin University, Perth 6845, Australia

  • Received Date: 2023-08-17
  • Accepted Date: 2024-03-08
  • Rev Recd Date: 2024-03-07
  • Publish Date: 2024-06-12
    Abstract
  • Deep-sea energy soil refers to deep-sea sediments where gas hydrates are filled in various modes within the pores. The filling effect of gas hydrates significantly impacts the density and porosity ratio of deep-sea energy soil. Additionally, the cementation effect of gas hydrates generates increasing bonding force with increasing saturation, jointly affecting the complex mechanical properties of deep-sea energy soil. Furthermore, deep-sea energy soil is a distinctive structural soil, wherein the particle framework, pore characteristics, and arrangement influence its strength, strain softening, and characteristics such as shear dilation and contraction. Within the framework of the CSUH model, this research reflected the compressibility characteristics of gas hydrates on energy soil by establishing pressure-hardening parameters related to gas hydrate saturation. Furthermore, considering the influence of gas hydrate filling effects, the actual initial porosity calculation formula for energy soil was derived and incorporated into the state parameters to reflect its shear dilation characteristics. Finally, utilizing structural parameters describing soil damage effects and cementation parameters related to gas hydrate saturation as hardening rules, an elastoplastic constitutive model for structural deep-sea energy soil considering gas hydrate filling effects was established. Comparative analysis with indoor experimental results validates the model's efficacy in effectively reflecting the complex mechanical properties of energy soil under various gas hydrate saturations and confining pressure conditions, including strain hardening and softening, as well as volume shear dilation and contraction.

     

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