To study the long-term deformation afterconstruction of high-filled soil under partial saturation

the rate sensitivityand creep tests of unsaturated compacted soil undercontrollable matric suction were carried out respectively

and the time-dependent corresponding relationship between themwas analyzed. The rate-sensitivity tests used the triaxial shear method atdifferent loading rates to analyze the effects of matric suction (0

100

200

and 300 kPa)

loading rate (0.4 and 0.02 mm/min)

and over-consolidation ratio(1

4

and 8) on the strength and deformation characteristics of the soil. The0.45

0.65

and 0.85 times of shear strength are determined to be thethird-order stress level loads of triaxial shear creep respectively. The triaxialshear creep tests of unsaturated compacted soil were carried out under fourcontrollable matric suction forces (0

100

200

and 300 kPa)

referring to theChen loading method

and under three stress level graded loading. The resultsshow that: 1) The rate sensitivity parameter of unsaturated compactedsoil decreases with the increase of matrix suction

and its rate sensitivityalso decreases. 2) With the increasing of matric suction

the initial maximumcreep rate

stable creep rate and creep deformation of unsaturated compactedsoil decrease significantly. 3) The strain rate-strain relationship linedetermined by the creep test is consistent with the strain rate-strain datapoints obtained by the rate sensitivity test

which proves that there is a certaintime-dependent corresponding relationship between the rate sensitivity andcreep

and this relationship becomes more significant with the increase ofmatrix suction.