Coarse grained soils have been widely used in engineering construction because of the advantages of high shear strength

easy compactability

small deformation and so on. There is still few research on dynamic properties of coarse grained soils

and theoretical research lagged behind the practices. In engineering designs

coarse grained soils were usually regarded as nonliquefiable soils. However

reports of after-earthquake surveys both in China and abroad show that coarse grained soils were serious liquefied. Therefore

under a given earthquake shaking

coarse grained soils with loose to moderate density have much potential to be liquefied. In this study

a Cyclic-mobility constitutive model

which can describe the cyclic-mobility and liquefaction characteristics of soils

was employed to discover the dynamic characteristics of coarse grained soils. On the basis of model parameters calibration

the different influencing factors which affecting dynamic properties of coarse grained soils were further studied

such as the friction between loading plates and specimen

gravitational force of specimen

cyclic shear ratio

confining pressure and loading frequency. The results show that Cyclic-mobility constitutive model can well reproduce the stress-strain characteristics of coarse grained soils under undrained triaxial test

gravitational field and the friction between loading plates and specimen have some effects on the laboratory element test results of coarse grained soils. Under lower confining pressure or higher cyclic shear stress ratio

thephenomenon of larger dynamic strain and the uneven distribution of dynamic strain inside samples will be more obvious. The distributions of volumetric strain inside samples are similar under lower loading frequencies

however

the combined action of high loading frequency and cyclic shear stress ratio will cause large damage on the sample. In the triaxial test

when studying the dynamic response of soil elements at different locations by triaxial test

attention should be paid to the arrangement of strain sensors

and the results should be considered comprehensively and corrected appropriatel.