Coeffcient of consolidation by the velocity method

Abstract

The velocity method described is based on reducing the curve representing the Terzaghi consolidation rate and an exponential settlement-time curve from oedometer tests to a form in which they are geometrically identical. The classical solution of the consolidation equation is given as a velocity plot and all experimental behaviour must be geometrically similar except for secondary compression. This curve may thus be used as an overlay for any experimental curve. Both curves are plotted to a double logarithmic scale and relationships can then be established by direct super-position of the two curves. The velocity method described thus overcomes the disadvantages of the traditional log t and t 90 methods that require graphical constructions that are not amenable to automatic processing. (TRRL)