Journal Published Online: 01 June 1996
Volume 19, Issue 2

Direct and Indirect Permeability of Fissured Tills



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, Canada
Pages: 12
Price: $25.00
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Stock #: GTJ10341J
ISSN: 0149-6115
DOI: 10.1520/GTJ10341J