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Abstract A series of one-dimensional electroosmotic consolidation experiments with the test tank built in-house were carried out on dredger filling. The current intensity，the drainage and the electric potential were monitored. The final water content，the shear strength，the coefficient of electroosmotic permeability，and some other indices were analyzed to investigate the influence of applying stepped voltages on electroosmotic consolidated dredge fillings. Test results showed that different programs of stepped voltage yielded quite different treatment efficiencies for dredge fillings；In comparison to applying 25 V constantly，the technique of stepped voltage reduced energy consumption，improved electroosmotic efficiency at later stage and raised water drainage，enhanced the soil shear strength near the cathode region effectively and reinforced the soil more homogeneous. Appropriately raising the initial voltage increased the water discharge of electroosmosis significantly. Very high initial voltage did not lead to further improvement in soil consolidation，but to more energy consumption.
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Received: 21 October 2013
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2014, Vol. 33 
