Laboratory Test on Volumetric Characteristics of Saturated Sea Sand Under Cyclic Loading

The deformation of sea coast or sandy deposits caused by earthquakes can lead to catastrophic damages to various port structures ,The volumetric deformation is mainly induced by densification of sand during the dissipation of excess pore water preassure created by cyclic loading,Based on laboratory test ,the reconsolidation volumetric characteristics of saturated sea sand are investigated.The experiments are conducted with a newly-developed multi-functional triaxial test equipemnt.Two types of dynamic loads are applied to the samples to clarify different kinds of affecting factors ,It is found that the reconsolidation volumetric strain is correlated not only to the excess pore water pressure aand the maximum shear strain during the dynamic loading,but also to the effective confining pressure,A new formula is put forward to calculate the volumetric strain during reconsolidation.