FINITE ELEMENT SIMULATION OF ELECTRO-OSMOTIC CONSOLIDATION FOR IMPROVING CONTAMINATED SOIL

Abstract

ABSTRACT In recent years, geotechnical soil problem have increased because various types of contaminants such as petroleum products, organic contaminants and heavy metals as a result of expansion and development of urban and industrial activities, so it is very important to investigate the impacts of contaminants on the geotechnical properties of soil and investigate a suitable technique for the remediation of soil. In this study a numerical model is proposed for electro-osmotic consolidation of improved contaminated soil by coupling the seepage field, electric field, and the stress and strain field. The soil mass deformation, pore-water pressure and the electrical voltage are the basic variables in the governing equations. Two-dimensional finite element model by used software Comsol v.5, developed to simulate the electro-osmotic consolidation process, predicting of soil mass displacement. As a methodology of research in general three interface model, first one is mechanical solid model to explain displacement and deformation under constant load (250kN/m) . The second model is Darcy's model to variety of hydraulic permeability of soil mass during consolidation is incorporated in the control equations. The boundary conditions for electrical field, seepage flow and displacement can be adequately simulated. Third model deals with the effect of electrical model where used various dimension of electrode (anode and cathode) various length ( 2.5, 3, 4m)and distance between as.( 1.5, 2, 2.5m)