Strain-Dependent Dynamic Properties of Remolded Sand-Clay Mixtures

A series of undrained cyclic torsional simple shear tests using hollow cylindrical torsional shear apparatus was carried out to investigate the dynamic shear moduli and damping properties of clayey specimens with various sand contents and plasticity indices. The clayey soils used were collected from various sites along the coast of west Japan. Among these clayey soils, a clay sample with intermediate plasticity and another with high plasticity were mixed with silica sand at different proportions in order to examine the dynamic properties of sand-clay mixtures. In addition, experiments were carried out on undisturbed and remolded natural clay specimens with various plasticities. The effects of plasticity, loading frequency and confining pressure on the strain dependent normalized shear modulus and damping ratio were examined. Based on the results, empirical correlations for predicting the normalized shear modulus and damping ratio of remolded sand-clay mixtures at various shear strain levels were proposed.

[1]  M. Novak,et al.  Dynamic properties of some cohesive soils of Ontario , 1981 .

[2]  I. M. Idriss,et al.  Moduli and Damping Factors for Dynamic Analyses of Cohesionless Soils , 1986 .

[3]  Rolando P. Orense,et al.  Initial Shear Modulus of Remolded Sand-Clay Mixtures , 2008 .

[4]  Takeji Kokusho,et al.  CYCLIC TRIAXIAL TEST OF DYNAMIC SOIL PROPERTIES FOR WIDE STRAIN RANGE , 1980 .

[5]  Fumio Tatsuoka,et al.  Advanced laboratory stress-strain testing of geomaterials , 2001 .

[6]  F. E. Richart,et al.  Elastic Wave Velocities in Granular Soils , 1963 .

[7]  B. Hardin,et al.  VIBRATION MODULUS OF NORMALLY CONSOLIDATED CLAY , 1968 .

[8]  V. S. Chandrasekaran,et al.  Behavior of Marine Sand-Clay Mixtures under Static and Cyclic Triaxial Shear , 2005 .

[9]  F. E. Richart,et al.  EFFECTS OF STRATINING ON SHEAR MODULUS OF CLAYS , 1976 .

[10]  Fumio Tatsuoka,et al.  Hysteretic Damping of Sands under Cyclic Loading and its Relation to Shear Modulus , 1978 .

[11]  R. Dobry,et al.  Effect of Soil Plasticity on Cyclic Response , 1991 .

[12]  B. Andreasson.  Dynamic Deformation Characteristics of a Soft Clay , 1981 .

[13]  T. Kokusho,et al.  DYNAMIC PROPERTIES OF SOFT CLAY FOR WIDE STRAIN RANGE , 1982 .

[14]  W. F. Marcuson,et al.  Time Effects on Dynamic Shear Modulus of Clays , 1972 .

[15]  Fumio Tatsuoka,et al.  EFFECTS OF GRAIN SIZE AND GRADING ON DYNAMIC SHEAR MODULI OF SANDS , 1977 .

[16]  T. Mitachi,et al.  Strain rate effects on shear modulus and damping of normally consolidated clay , 1995 .