A SIMPLE AUTOMATIC FALLING HEAD PERMEAMETER

The usual method of measuring the permeability of a homogeneous soil in the laboratory is a constant head or a falling head test. Of the two methods, the falling head test is more suitable for measuring the permeability of homogeneous clay as very small flow quantities are involved. The proposed method is to keep the conventional falling head test unchanged except to measure the falling head automatically through a very accurate differential pressure transducer. The low pressure end of the transducer is opened to the atmosphere to correct for changes in the atmospheric pressure over the 24 hour duration of a typical permeability test. By means of several repeated falling head permeability tests at different initial heads for the same effective stresses, it is demonstrated that reasonably reliable and repeatable measurements of permeabilities of clay can be made, provided that the applied head difference as a proportion of the current vertical stress is small, so that no significant consolidation or swelling is induced by the seepage head. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    Japanese Society of Soil Mech & Foundation Engrs

    Tokyo,   Japan 
  • Authors:
    • Tan, S A
  • Publication Date: 1989-3

Media Info

  • Features: References;
  • Pagination: p. 161-164
  • Serial:
    • SOILS AND FOUNDATIONS
    • Volume: 29
    • Issue Number: 1
    • Publisher: JAPANESE GEOTECHNICAL SOCIETY
    • ISSN: 0038-0806

Subject/Index Terms

Filing Info

  • Accession Number: 00492811
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1990 12:00AM