<p>Electro-osmosis (EO) treatment has been widely used in both geotechnical and environmental engineering in accelerating the consolidation process of soft soils and restoring contaminated soils, respectively. However, the coupled mechanisms between EO-induced consolidation and chemical transport remain unclear due to the knowledge gap between geotechnical and environmental fields. In this study, a novel coupled model associated with experimental and numerical validations for the horizontal EO consolidation and the heavy metal ions (HMIs) transport is established. The model incorporates the multiple factors, including EO, electromigration, advection, diffusion and adsorption. Meanwhile, nonlinear variation laws of soil characteristics for volume compressibility coefficient (VCC), hydraulic permeability coefficient (HPC) and electro-osmosis permeability coefficient (EOPC) with void ratio during the consolidation process are considered. Finally, EO experiments and simulation analyses have been conducted to accurately evaluate the effective ionic mobilities in soils and provide insight into the effects of consolidation parameters on the transport behaviors of HMIs. The results reveal that the addition of HMIs leads to a higher current value but a lower drainage volume. Increasing values of VCC and EOPC are both beneficial to HMI transport, whereas HPC has the opposite effect. The existence of lead contamination source results in a higher current value but a lower drainage volume. Overall, the study is of significant importance for understanding and calculating the influence of soil consolidation on the HMI transport process during EO treatment of contaminated soil.</p>