Experimental study on dynamic deformation and dynamic strength of tailing sands

The properties of dynamic deformation and strength of tailing sands under various consolidation conditions are studied by triaxial tests.The result shows that the relationship between stress and strain can be described by Hardin model.The maximum dynamic shear elastic modulus and maximum dynamic shear in the model increase with the increase of consolidation stress ratio and effective confining pressure.The influences of consolidation stress ratio and effective confining pressure can be expressed by power function relationships with axial compressive pressure.The damping ratio increases with the increase of dynamic shear strain.The relationship between damping ratio and dynamic shear strain is almost independent of consolidation stress ratio and effective confining pressure.In spite of the consolidation condition,the relationship between damping ratio and reduction of dynamic shear elastic modulus ratio is linear in log-log coordinate.Dynamic shear stress at failure increases with the increase of consolidation stress ratio and effective confining pressure.The dynamic shear stress ratio is almost independent of effective confining pressure,but it decreases with the increase of consolidation stress ratio.