抄録
The stability of the repository of high-level radioactive waste (HLW) disposal was discussed. To examine the effect of the degradation of crystalline rock on the behavior of near field of the repository, the damage exapansion model was applied with the varying boundary conditions for one million years. The elastic model, the constant degradation model and the hypothetical progressive degradation models were examined. It was observed from the analyzed results that the damage would be developed locally at the spring line and crown of repository tunnel. At about one hundred years after closure of repository, the damage evolution would be finished even if the degradation progressed so long.
