GAS PRESSURE IN UNSATURATED OFFSHORE SOILS

Direct measurement of gas pressure within unsaturated offshore soils is very difficult because the gas occurs in the form of large, discrete bubbles. However, consideration of the soil structure and analysis of a continuum model for the soil suggest two independent sets of limits for the gas bubble pressure. Surface tension effects limit the difference between gas pressure and pore-water pressure, while cavity expansion and contraction considerations limit the difference between gas pressure and mean total stress. If the gas pressure lies within these limits, it should remain almost unaffected by changes to the total stress or pore-water pressure. These suggestions are supported by results from an oedometer test on a reconstituted soil sample containing large bubbles of methane gas.

• Corporate Authors:

  National Research Council of Canada

  Research Journals
  Ottawa, Ontario K1A 0R6,   Canada 
• Authors:
  • WHEELER, S J
  • Sham, W K
  • Thomas, S D
• Publication Date: 1990-2

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 79-89
• Serial:
  • CANADIAN GEOTECHNICAL JOURNAL
  • Volume: 27
  • Issue Number: 1
  • Publisher: National Research Council of Canada

Subject/Index Terms

• TRT Terms: Bubbles; Expansion; Marine soils; Methane; Oedometers; Pore water pressures; Pressure; Stresses; Surface tension; Unsaturated soils
• Uncontrolled Terms: Cavity expansion; Total stress
• Old TRIS Terms: Test results
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00494487
• Record Type: Publication
• Files: TRIS
• Created Date: May 31 1990 12:00AM