Development of numerical simulation code for the salt accumulation/precipitation ocuur in the buffer material

Kimura, Makoto; Fujita, Tomoo ; Sazarashi, Masami

For the purpose of developing of the coupled Thermo-Hydro-Mechanical-Chemical(THMC) simulation code which is available to the prediction of the salt accumulation/precipitation, a chemical reaction model paid attention to unsaturated buffer material is discussed. In the THMC simulation code, chemical reaction model such as ion-exchange and surface complexation which are based on water-retention form and infiltration history under the unsaturated condition is considered. Some results of THMC simulation against the laboratory test are shown and it is found that mass-transport under the unsaturated/saturated condition is suitable but necessary to consider the change of solid/liquid ratio for the chemical reaction.