Thermal Migration Characteristics of Core Wall Dam Flow in Shangdian Reservoir Based on COMSOL

GUI Dongdong

doi:10.3969/j.issn.1004-7328.2026.03.019

Abstract：To study the leakage and failure mechanism of the core dam of Shangdian Reservoir,the Johansen mathematical thermal conductivity model was introduced,and the influence of the geometric and physical characteristics of the core wall on the flow heat transfer of the core dam was studied based on the COMSOL numerical calculation platform.Research has shown that the permeability coefficient of the core wall will change the head value and infiltration line of the core wall dam,especially the stable period of the infiltration line will be affected.In contrast,the permeability coefficient of the core wall has a higher impact on the single width seepage volume of the dangerous area than the total single width seepage volume of the core wall.As the permeability coefficient of the core wall increases,the temporal changes in the temperature field of the core wall dam will not be affected,but will only alter the temperature distribution level of the core wall dam.The inclination of the core wall has a relatively small impact on the water head value of the core wall dam,but it will change the balance of the seepage line of the dam body.At the same time,the inclination of the core wall has less effect on the single width seepage flow of the dangerous area than the total single width seepage flow of the core wall.The inclination of the core wall will change the temporal trend of the temperature field of the core wall dam and shorten the stable period of the temperature field of the core wall dam.The research conclusion has certain reference significance for the coupling study of seepage field and temperature field of reservoir core wall dam,as well as the exploration of leakage failure mechanism.