Centrifuge modeling of freezing behavior of clay

摘要

In this research, three kaolin soil columns were subjected to freezing temperatures ― two under ramp-freezing and one under step-freezing conditions. One was frozen at 1g, whereas the others were frozen at 35g.frozen in this research. At 35g they simulated freezing behavior in full-seale columns 4m in depth, with a water table 1m below the soil surface. The following conclusions were drawn High initial water content acted to: reduce the depth of freezing; increase the immediately accessible supply of pore water available for freezing; and allow suction pressures to be sustained in the zone preceding the freezing front. Centrifugal acceleration was proven to influence the magnitude and development of frost heave, but the ratio of heave/depth of freezing was roughly the same in both models. The freezing regime strongly influenced the development of frost heave in terms of magnitude and rate. Ramp-freezing led to greater and more prolonged cooling induced compression, and much greater ultimate heave. High water content and lower permeability of the clay led to freezing response that differed from that observed in columns of silt.