Test apparatus and method for field measurement of surface permeability

The permeability coefficient of the field surface is the essential parameter for analyzing both the slope stability and the small watershed rainfall yield. A new method and device is described for field measurement of the surface permeability coefficient. The device combines the advantages of a direct rainfall infiltration test and a two-ring infiltration test device to achieve a saturation surface with zero water pressure infiltration measurement of a slope. The permeability of surface soil can be obtained directly by proposed method. Infiltration tests on a mountainous basin are carried out, and the soil permeability and suction are obtained.