Abstract
Currently, the N value or shear wave velocity is generally used to estimate the liquefaction resistance. However the correlation between theses was not always good. Therefore, in order to investigate the correlation between relative density, dynamic shear modulus and liquefaction strength of sandy soils. A series of drained compression test and liquefaction test were conducted on Toyoura sand by using triaxial apparatus. And we measured the shear wave velocity during the test to calculate the dynamic shear modulus of specimen. It was found that the dynamic shear modulus was increased as the number of drained vertical cyclic loadings increases, which may indicate that the interlocking effect was enhanced by the drained vertical cyclic loading history. On the other hand, from the results of drained compression test and liquefaction test, the effect of changes in the microscopic structure of sandy soils due to drained vertical cyclic loading history on the drained compression strength and liquefaction strength became clear.
