Volume 19, Issue 2 (June 1996)

    Direct and Indirect Permeability of Fissured Tills


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    Comparison of direct and indirect measurements of water permeability on relatively large undisturbed and compacted Scottish till specimens in rigid-wall (Rowe cells) and flexible-wall (triaxial cells) permeameters shows the interaction of macro-fabric, test method, evaluation basis, effective stress, and possibly sidewall leakage. At low stresses, the sidewall leakage in a Rowe cell is the most likely cause of the directly measured permeability, kd, and pore-pressure-dissipation-based permeability, kp, becoming higher than settlement-based permeability, ks. Similarly, fissures raise permeability measured in both permeameters. Generally, kp is higher than ks (or volume-change-based kv from triaxial cells) with ka in between but closer to ks (or kv). The differences decrease with increasing stresses; the reduction rate for fissured specimens is dependent on fissure coating thickness and permeability.

    Author Information:

    Hossain, D
    Toronto, Ontario

    Stock #: GTJ10341J

    ISSN: 0149-6115

    DOI: 10.1520/GTJ10341J

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    Title Direct and Indirect Permeability of Fissured Tills
    Symposium , 0000-00-00
    Committee D18