Developing a constitutive model able to describe soil behaviours under monotonic loading

Abstract

Nowadays, developing a constitutive model for soil has been popular as soil reacts differently with various loading conditions. There have been many studies that are conducted to develop a constitutive model for soil. However, these models are only able to describe the behaviours of soils under certain loading conditions, and the input parameters for soils have to be modified that are different from the data collected from the experiment to fit the simulation results to the experiment results. In this study, a constitutive model is developed based on a well-known and effective constitutive model in the literature and emphasizes the unreal input of Poisson’s ratio issue. The developed model employs the real Poisson’s ratio as the input parameter and the hardening and dilatancy formulations will be improved. By comparing the simulation results of the original and developed model with the experimental data, the developed model can overcome the problems of overreacting and underestimating the hardening and dilatancy parameters when inputting the real value of Poisson’s ratio. This result plays a significant role in developing a constitutive model and contributes to the research field a developed model so that researchers can continue to develop this model to describe soil behaviours.