Abstract: A series of experiments about dynamic triaxial apparatus were carried out to study the dynamic response behavior of silt from Hangzhou Bay. We studied the influence of structure, loading frequency, dynamic stress on dynamic strain, critical cyclic stress ratio, and the dynamic strength. The test results implied that, under the same loading conditions,the remoded samples are more likely to undergo structural failure than the undisturbed ones in smaller cycles. However, the dynamic strength of undisturbed soil is greater than that of remoded ones. Structural impact become an important factor influencing the dynamic strength of soil samples, the influence increased with the increase of dynamic stress, and decreased with the increase of frequency. On the other hand, the variation of loading frequency has significant effect on the dynamic characteristics of silt, the more frequency increased, the more cycles sample required to reach a failure, at the same time, the critical cyclic stress ratio of silt is also enlarged.

Key words: Hangzhou Bay, silt, cyclic loading, structure, dynamic strength