Effect of frequency of cyclic loading on liquefaction and dynamic properties of saturated sand

The effect of frequency of cyclic loading on liquefaction and post-liquefaction resistance of original Ahmedabad sand has been presented in this technical paper. Saturated and consolidated specimens prepared to a particular relative density were subjected to varied frequencies at a constant cyclic stress ratio under undrained conditions. Specimens were cyclically loaded till liquefaction. It was observed that the rate of generation of excess pore water pressure increases with increase in frequency of cyclic loading as a result the cyclic liquefaction resistance decreases with increase in the loading frequency. From the study on dynamic properties, it is found that the shear modulus decreases and damping ratio increases with increase in frequency. The frequency of cyclic loading has no influence on the shear modulus at a particular shear strain. It is also seen that the shear modulus decreases and damping ratio increases with increase in shear strain.