Abstract:

Taking the loess-like silty clay in Sanmenxia area for the study object, using undrained test method on the improved triaxial test instrument,the unsaturated soils triaxial test were carried out by controlling the different dry densities and moisture contents of the remoded soil preparing to different states of samples. The test results show that the matrix suction of loess-like silty clay has a close relationship with the changes of the soil basic state; particularly, in the same moisture content and the same confining pressure, the matrix suction under the different dry densities conditions will increase firstly and then decrease as the saturation increasing. which can be analyzed by the parameters of the structural body making up with the soil particles in the unit soil.

Key words: unsaturated soil, matrix suction, dry density, moisture content, saturation