COEFFICIENT OF PERMEABILITY FROM AC ELECTROOSMOSIS EXPERIMENTS. I: THEORY

Electrochemical changes and gas generation from prolonged application of a direct current electric field limit the use of electroosmosis techniques in determining soil properties. The authors of this paper develop a method that uses a weak alternating current (AC) as the driving force to minimize these adverse effects. The governing partial differential equation for one-dimensional AC electroosmosis is presented for an experimental situation in a companion paper. Three boundary conditions are identified that reflect the possible range for a closed boundary. Transient and steady-state solutions are determined for ideal undrained boundary conditions. Analytical steady-state solutions are given for the two nominally undrained boundary conditions. The solutions reveal that small deformation of the boundary cavity as well as impedance effects due to relatively low permeability of an equivalent porous stone play an important role in pore-pressure responses. Techniques based on the steady-state solutions for backcalculating the coefficient of permeability are presented.

Language

  • English

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: p. 346-354
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00720458
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 29 1996 12:00AM