Numerical Simulation Of Ionic Solute Migration In Soil

In recent years, environmental pollution is more and more serious. When the pollutantsdiffuse with pore water in the soil, it is in the process of complex coupled multi-field. In orderto evaluate the long-term effects of pollutants in soil, it is important to establish amathematical model to take a numerical analysis of the coupled field. In the paper, itdevelopes the numerical analysis method for ionic solute. Meanwhile, the paper is about thechemo-hydro-mechanical coupled numerical analysis of the ionic solute migration in soil.In the paper, considering the Langmuir isotherm equation to describe nonlinearequilibrium sorption, develop the mathematical model of contaminant migration in porousmedium. The model is based on the migration mechanism of pollutants in porous medium andthe conservation of mass. The finite element model of the governing equations werediscretized with the Full Upwind Petrov-Galerkin Method (FUPG), and the program of themodel was developed. And using the solving program to analyse the influence of somemigration mechanism parameters to contaminant transportation.Based on the experimental results about effect of inoic solute to soil deformation andthe existing chemo-hydro-mechanical constitutive model, the paper defines pre-consolidationstress softening function. And it uses the softening function to reflect the influence ofpollution about soil physical mechanical properties. Considering the influence of pollutionabout soil physical mechanical properties, it developes the existing chemo-hydro-mechanicalconstitutive model. And through a simple numerical simulation examples for constitutivemodeling of soil chemical-mechanical coupling behavior, it verifys the validity of themodified constitutive model.Finally, the paper carries chemo-hydro-mechanical coupled numerical simulation by usethe developed FUPG finite element model of ionic solute and the developedchemo-mechanical constitutive model. It predictes the pollutant diffusion in soil and theinfluence of pollutant on soil mechanics properties in a long term.