AIR DIFFUSION THROUGH MEMBRANES IN TRIAXIAL TESTS

Cyclic tests on saturated sand samples yield difference in pore pressure resulting from various distances between the air-water interface and the soil specimen which are not as clear-cut as those obtained from triaxial tests on clay, thus precluding correction of pore pressure measurements for diffused air, especially for tests on sand of several hours duration. For stationary conditions the amount of diffused air in the specimen is independent of the length of the diffusion path. A possible solution to the problem may be to have a glycerine layer above the packing-membrane unit to prevent diffusion. During cyclic loading the slock membrane is able to follow small movements of the cell water without resistance. With this device, no measurable increase in pore pressure caused by air diffusion was noted.

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  • Supplemental Notes:
    • Discussion of Proceeding Paper 13250 by Wayne S. Pollard, Dwight A. Sangrey and Steven J. Poulos, October, 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • Winter, H
    • Goldscheider, M
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00183214
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13999
  • Files: TRIS
  • Created Date: Nov 14 1978 12:00AM