Experimental Investigation on Dynamic Characterization of Equi-Proportionate Silt-Sand Range Pond Ash at High Strain

摘要

In the present study, it was attempted to investigate the cyclic resistance of equi-proportionate silt-sand range pond ash (with 50% fines) at relatively high shear strains using the strain-controlled cyclic triaxial test. The cyclic triaxial tests have been performed considering the effect of relative compaction (97-99%), cyclic shear strain (0.6-1.35%), frequency of loading (0.3-1 Hz) and effective confining pressure (50-100 kPa) on cyclic resistance of pond ash. Dynamic characteristics such as dynamic shear modulus and damping ratio of equi-proportionate silt-sand range pond ash was evaluated for all the parameters considered at high shear strain. The maximum value of the dynamic shear modulus and damping ratio of pond ash observed in this study was 6534.8 kPa and 23.64%, respectively. The dynamic shear modulus and damping ratio of pond ash was decreased from 6534.8 to 5023.87 kPa and 23.64 to 14.17% with the increase in shear strain amplitude from 0.6 to 1.35%. Besides, few relationships were established between the amount of energy dissipated until liquefaction and parameters influencing liquefaction using an energy concept.