Abstract: This paper presents the shear band test results on the remolded red clay samples. Form the undrained triaxial test results, the shear failure modes were observed and the stressstrain characteristics were evaluated. The conditions that lead to the formation of the shear band in the sample were discussed and the inclination angle of the shear band was also measured and calculated. The results indicate that, under the undrained triaxial test conditions, the four different shear band shapes can be developed: single band, subsingle band, double bands with "T" shape and more than two parallel bands. There are significant different between the measured and predicted shear band inclination angles and the measured angle is generally greater than the predicted angle. The inclination angle predicted with MohrCoulomb theory is closer to the measured value. The heterogeneous soil property is the main factor leading to the development of the shear band, the loading magnitude and the boundary conditions are also the influence factors of the shear band formations. The inclination angle of the shear band is also influenced by the magnitude of the confining pressure and the dry density of the remolded sample.

Key words: Red Clay, Shear Band, Inclination Angle, Influence Factor