Infiltration flow in unsaturated soils often occars in engineering;and unsaturated hydraulic conductivity is one of important topics of unsaturated soils. Using the pressure-plate extractor

the soil-water characteristic curves under different compactive water contents and different compactive efforts are obtained. The corresponding saturated permeability coefficient is gotten by the variable water level method. Combined with the soil-water characteristic curves and saturated permeability coefficient

based of Van Genuchten model and Fredlund model

permeability of remoulded unsaturated clay under different compactive conditions is discussed in detail. The results show that the permeability coefficient decreases with the increase of compactive water content; and the its difference reduces with the increase of suction; and permeability coefficient can be assumed identical when the suction reaches 1 MPa. The permeability coefficient of samples compacted with standard Proctor compactive efforts and reduced Proctor compactive efforts are very similar. The value of is about 0.01 in saturated state

and increases with the suction increases. When the suction reaches 1 MPa

the value becomes 0.1 gradually.