STP977

    Triaxial Testing of Marine Sediments with High Gas Contents

    Published: Jan 1988


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    Abstract

    Gas types, zonation present in marine sediments, the corresponding mechanism of bubble formation, and methods of performing traxial tests on gassy sediments are discussed. Gases (methane and hydrogen sulfide; methane gas predominates) may be found either in solution or in the bubble phase in the sediment. A method to estimate the amount of gas that theoretically comes out of solution is shown. The result of gas bubbles is a reduction in the bulk modulus of the pore fluid. The bulk modulus of a gas-water mixture decreases with incresing fluid pressure. Results of decreasing bulk modulus are shown to reduce the pore pressure increment per application of a load increment. Triaxial testing techniques are recommended when (1) gas is in solution, (2) gas is in the bubble phase, and (3) gas is still evolving.

    Keywords:

    gas, pore pressure, marine, sediments, triaxial


    Author Information:

    Rau, G
    Undergraduate student, Humboldt State University, Arcata, CA

    Chaney, RC
    Professor and director, Humboldt State University Marine Laboratory, Trinidad, CA


    Paper ID: STP29085S

    Committee/Subcommittee: D18.05

    DOI: 10.1520/STP29085S


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