IN-SITU VOLUME-CHANGE PROPERTIES BY ELECTRO-OSMOSIS--EVALUATION

Johnston takes issue with Mitchell and Banerjee's assumption that the soil is uniform and therefore of constant specific resistivity. He cites his own experience where, because of unavoidable nonhomogeneities in a natural soil mass when electro-osmosis is applied, the voltage and therefore the porewater pressure gradients immediately adjacent to the undrained electrodes are high. This leads to a very rapid increase of porewater pressures to their final steady-state values at the undrained electrode that may be considered instantaneous. Although the "electrically homogeneous" solution did produce quite acceptable agreement with the experimental average degree of consolidation by virtue of the curve fitting processes and further with values of c sub v obtained from the isotropic and electro-osmotic stages of testing, it did not predict with any degree of accuracy the porewater pressure isochrones for the whole of each specimen. The authors reply that this problem should not exist for the solutions developed for interpretation of consolidation properties from the results of electro-osmosis measurements by the method presented in their paper. They concede there may be other complicating factors such as thermal effects, gas evolution, and electrochemical effects, but feel that these are separate problems.

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  • Accession Number: 00335546
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 16287 Proceeding
  • Files: TRIS
  • Created Date: Oct 28 1981 12:00AM