Development of a soil constitutive model capable of simulating the liquification behavior under monotonic and cylic loading

Abstract

Currently, the development of a constituive model capable of simulating liquefaction behaviour is crucial as this phenomenon can cause catastrophic disasters and significant damage to infrastructure, buildings, and construction works. Although there have been many studies on material models that can simulate liquefaction behavior, most of these models have limitations, such as only being able to simulate certain loading conditions or requiring adjustments to input parameters to match experimental results. In this study, the author developed a material model based on an efficient and commonly used model, with the aim of simulating liquefaction behavior under uniaxial and cyclic loading, while also addressing the issue of Poisson's ratio being adjusted differently from experiments. This improved material model uses the real Poisson's ratio of the soil sample to set the value of the Poisson's ratio input into the material model, and the equation for the dilation will be adjusted accordingly. We compared the simulation results of the two models and observed that this improved material model can overcome the issue of not being able to simulate liquefaction when subjected to cyclic loading, allowing the model to simulate sudden increases in deformation and pore water pressure in the soil, improving the accuracy of the model. This result has significant implications for the development of constitutive models to simulate liquefaction and supports researchers in developing this material model to simulate other soil behaviors.