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Triaxial testing system for pressure core analysis using image processing technique.

J Yoneda1, A Masui, N Tenma

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A new triaxial testing system accurately measures the strength and deformation of deep-sea gas hydrate sediments. This system enables crucial insights into the mechanical behavior of these sensitive marine materials.

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Area of Science:

  • Geotechnical Engineering
  • Marine Geology
  • Petroleum Engineering

Background:

  • Deep-sea gas hydrate-bearing sediments are crucial for understanding geological stability and energy resources.
  • Investigating the mechanical properties of these sediments under in-situ conditions presents significant challenges.
  • Existing testing systems often require depressurization, altering sample integrity.

Purpose of the Study:

  • To introduce and validate a novel triaxial testing system for gas hydrate-bearing sediments.
  • To assess the strength, deformation, and permeability characteristics of these sediments.
  • To enable in-situ testing without compromising sample pressure.

Main Methods:

  • Development of an innovative triaxial testing system with a specialized sealing sleeve.
  • Transport of pressure cores without depressurization from storage to the triaxial cell.
  • Utilizing an image processing technique with digital photography to capture specimen deformation during compression tests.
  • Conducting tests under high confining and pore water pressures.

Main Results:

  • Successful measurement of material strength in gas hydrate-bearing sediments.
  • Evaluation of the failure mode under simulated deep-sea conditions.
  • Demonstration of the system's capability to maintain sample integrity during testing.
  • Acquisition of detailed deformation data through image processing.

Conclusions:

  • The newly developed triaxial testing system is effective for investigating the mechanical behavior of gas hydrate-bearing sediments.
  • The system allows for accurate strength and deformation measurements under high-pressure conditions.
  • This technology advances the study of deep-sea sediment properties and stability.