Using large-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 material of Shuangjiangkou earth dam. The behaviour of coarse-grained soil under K0-consolidation is investigated. The test results from K0 consolidated-drained tests are compared with those from isotropically consolidated-drained tests. The results show that the relationship between mean principal stress and volumetric strain and between deviatoric stress and deviatoric strain during the K0-consolidation can be fitted with power function. In the stage with steady pressure after K0-consolidation

the strain-time curve can be fitted with exponential function. The strength of K0 consolidated-drained triaxial shear test is slight greater than that of isotropically consolidated-drained test. The initial elastic modulus Ei and Poisson’s ratio vi obtained from K0 consolidated-drained triaxial test is larger than that from isotropically consolidated-drained test. The dilatancy K0-consolidated sample is more evident.