In order to consider spatial effect of excavation engineering

Duncan-Chang nonlinear elastic model and Mohr-Coulomb ideal elastoplastic model attained by K0 consolidation and normal consolidation samples with CU tests are adopted; and the whole 3D finite element analysis of soft soil excavation engineering in Fuzhou city using 3D solid elements

shell elements and beam elements considering contact interactions is built which applies ABAQUS software. The response of the whole system during the construction of the foundation pit is done by numerical simulation “object tests”; and it is compared with the field measurements and 2D numerical simulation results. It is shown that compared with Mohr-Coulomb ideal elastoplastic model and 2D results

the results from 3D numerical simulation analysis using Duncan-Chang constitutive model parameters attained by K0 consolidation samples with CU tests are more reliable. It has distinct advantages and possesses of tremendous popularization and application value.