To study the post-liquefaction stress-strain relationship of saturated Nanjing sand

shear moduli reduction in the liquefaction state

the dilation state and the unloading state were investigated under different loading conditions. As results

the effective confining pressure

the initial shear loading

and the amplitude of cyclic loading have less effect on shear moduli reduction of saturated Nanjing sand in the liquefaction state and the dilation state. However

these factors have great effect on shear moduli reduction of saturated Nanjing sand in the unloading state. As the effective confining pressure and the cyclic loading amplitude increasing

the post-liquefaction shear moduli of saturated Nanjing sand in unloading stage are all stronger and the shear moduli soften faster under the subsequent cyclic loadings. Meanwhile

as the initial shear stress increasing

the post-liquefaction shear moduli of saturated Nanjing sand are also stronger

but it softens slower under the subsequent cyclic loadings. Based on the test results

the decay function of the shear moduli of saturated Nanjing sand in different loading stages are also given.