Viscous effects, such as time-dependent response, are commonly observed in soft, sensitive soils and can pose significant challenges to both the superstructure and substructure in terms of serviceability. It has been observed that creep settlements can be comparable to primary settlements over long periods of time, highlighting the importance of considering these effects. Finite element models are widely utilized by researchers to analyze geotechnical problems, and accurate modeling of the viscous behavior of materials often requires complex constitutive models. The aim of this study was to demonstrate the time-dependent nature of soft, sensitive soils and to evaluate the use of ground improvement techniques, such as deep cement mix soil columns, in addressing this behavior. A parametric analysis of the lateral deformations of the diaphragm wall was also conducted. The finite element analysis was carried out using PLAXIS 2D, and three soil models were considered: the soft soil creep model, the soft soil model, and the Mohr–Coulomb model. The soft soil creep model was found to accurately predict the field behavior, as it accounts for the effect of secondary compression.