Studies on the design method of multi tunnels in geological disposal facility

Hayashi, Katsuhiko; Kishi, Hirokazu; Takebe, Atsuji*

The geological disposal facility for high-level radioactive waste has the new structure that consists of many tunnels in parallel (multi tunnels) at 300 m under the ground. Our organization designed this facility by using single tunnel model at the beginning, however we realized that this method can not predict where is excavation disturbed zone that is caused by excavation as multi tunnels characteristics. Now we are investigating the new design methodology with multi tunnel models that takes into account of their behavior for improving design accuracy.