In order to understand and master the dynamic characteristics of sandy soil with different silt contents, the authors carried out many indoor dynamic triaxial tests for five groups of sandy with silt which took from Panjin and Xiamen. Under the conditions of consolidation pressure of 100 kPa, 200 kPa, 300 kPa, stationary vibration frequency H=1 and cyclic loading, the authors found that the effective cohesion increases and the effective internal friction angle decreases with the increase of the silt contents. During the liquefied scope, the cementation and the strength have been increased with the increase of the silt contents.
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