ABSTRACT
Unsaturated soil mechanics properties are significantly important to geotechnical practice and have properties that differ from those of saturated soil. Particularly, compression properties, shear strength properties, and hydraulic properties for unsaturated soils occupied by the suction are defined as differences in the pore air pressure and pore-water pressure. There are a variety of experimental laboratory tests, which are developed in order to suction applications. The methods are classified as pressure technique using either a microporous membrane and high air entry disc, another is vapor pressure technique. The two differences in methods are closely related to concepts regarding each suction definition. The pressure technique is generally used in experimental tests in which obtained test results are widely published and useful to establish a constitute model for prediction of unsaturated soil behavior. The vapor pressure technique is possible to expand to high suctions.
