Experimental study on strength and shear band characteristics of sand under biaxial rotation of principal stresses
In order to deepen the understanding of soil stress direction dependence,biaxial rotation of principal stresses was realized by integrating specimen rotation and stress rotation,and a series of undrained fixed-axis shear tests were carried out on saturated dense sand.The results show that the strength of sand is closely related to the principal stress direction and the specimen bedding angle,and is subject to the coupling effect of these two factors.With the increase of the principal stress direction and the specimen bedding angle,the phase transition strength decreases gradually,and the failure strength is first enhanced and then reduced.However,there are differences in the coupling effects of various principal stress directions and specimen bedding angles on the phase transition strength and the failure strength.Furthermore,it is found that the development pattern of the shear band is mainly affected by the principal stress direction.
soil mechanicssandbiaxial rotation of principal stressstress direction dependencestrengthshear band
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