To address the lack of accurate evaluation methods for the mechanical properties of remolded soils with varying structural levels,this study adopts a combined cement-salt particle modification technique to prepare artificially structured specimens.Samples with different cement contents (0%,2%,3%,4%,and 5%) are subjected to consolidated undrained triaxial tests to systematically investigate their stress-strain characteristics and shear strength evolution laws at different structural levels.The results show that with the increase of cement content,the peak strength and initial stiffness of the soil are significantly improved.The stress-strain curves transition from strain-hardening to strain-softening,indicating a shift from plastic to brittle behavior as structure increases.Peak strength increases linearly with confining pressure,while the initial modulus increases with the power function of the confining pressure and is linearly related to cement content.Based on the above experimental results,a comprehensive stress-strain mathematical model is constructed by integrating the Duncan-Chang model with the exponential softening stage.The model has high fitting accuracy (R2＞0.99) and can accurately describe the mechanical properties of soil under various conditions.For practical applications,a cement content of 3%-4% is recommended to balance strength enhancement and brittleness control.This work provides theoretical support for the constitutive modeling and foundation improvement of structured marine soft soil.