Using middle-scale shearing device

K0 consolidated-drained triaxial test and isotropically consolidated-drained triaxial test under different confining pressures are performed for three relative density overburden materials of a certain rockfill dam.Comparison and analysis are made to research the influence on the test results.The results show that total stress strain relationship regularities of the two tests are approximately identical.Yet there are some slight differences: The dilatancy of CK0D TEST is more obvious than CID TEST;Under different confining pressures

the difference between peak deviator stress（average amplitude） of the two tests is 3.9%;Average internal friction angles under various confining pressures in CK0D TEST are bigger than CID TEST.Corresponding to three differents densities（2.17

2.22

2.40 g/cm3）

the internal friction angles are 0.88

0.48

and 0.43 degree higher in CK0D TEST.As densities increase

the strengths of both two tests increase significantly.Moreover

strength indexes are nearly linearly increasing with the increase of density.Parameters of Duncan-Chang Model are given and compared.There is no statistics difference between the parameters obtained from the two tests.