As a classic elastoplastic constitutive model

the Cam Clay model can precisely describe the stress-strain relationship of remolded and normally consolidated clay. While soil stress experiences unloading or cyclic loading

the soil may become overconsolidated. An overconsolidated soil shows different mechanical behavior compared to its normally consolidated counterpart. To investigate the mechanical properties of overconsolidated soil

a subloading-surface Cam Clay model

which takes overconsolidation factor into account

is introduced. Then a comparative analysis is carried out for the triaxial compression tests and shear tests of overconsolidated soil

and the stress-strain relationship and OCR variation of the soil under cyclic loading are also studied in detail. The results show that overconsolidation factor can significantly influence the mechanical properties of soil

and the soil has higher yield strength than its normally consolidated counterpart. In addition

the dynamic response of free field under earthquake incidence is analyzed

showing that the influence of overconsolidation factor plays a very important role in the seismic response of soil ground

especially under high-magnitude earthquake incidence. Based on the results of the free-field analysis

the nonlinear dynamic response of a typical pile-soil coupled system under earthquake incidence is analyzed. The results show that the high-frequency component of structure is significantly suppressed by the influence of soil nonlinearity. Because the soil quickly turns into overconsolidated state under cyclic loading

its strength increases significantly

if the subloading-surface Cam Clay model is adopted

when the overconsolidation factor is taken into account

especially under the incidence of high-magnitude earthquake. Therefore

to guarantee the accuracy and reliability of the simulation for pile supported structure under earthquake incidence

it is necessary to account for the overconsolidation effect.