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地層処分における多連設坑道の設計手法について

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

林 克彦; 岸 裕和; 武部 篤治*

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

高レベル放射性廃棄物の地層処分施設は、地下300m以深に多数の坑道を並列に配置(以下、多連設坑道)する従来あまり例のない構造物である。当機構においては、当初は従来の単一トンネルモデルによる設計が行われてきた。しかし、この方法では掘削に伴う坑道群特有の緩み領域を把握できないため、新たに坑道群を考慮できる多連設坑道モデルによる設計方法を検討している。

The geological disposal facility for high-level radioactive waste has the new structure that consists of many tunnels in parallel (multi tunnels). 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.

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