In order to study the influence of stress path on the constitutive relations for reshaped clay

the triaxial compression tests under stress paths with drainage in cases of increased

constant and decreased mean normal stress and undrained conventional triaxial compression test have been carried out

the stress-strain relations under the four stress paths are obtained.Through visualization the three-dimensional surfaces of shear and volume strain in the whole stress field under the four stress paths are given respectively by numerical modeling.In addition

the four families of shear and volume yield loci are plotted respectively.It is found through comparing the deformation results under the four stress paths that there are obvious differences in the stress ranges

the strain peaks

the shapes of strain surfaces and the trends of variation of volume yield loci

however

for the four families the shear yield loci are similar.These results demonstrate that the influence of stress path on the constitutive relations of clay is considerably large and could not be neglected

and it relates to the effective mean normal stress closely.