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緩衝材のオーバーパック支持力性能に関する検討

Assessment on Bearing Capacity of Buffer Material to Overpack

平井 卓; 棚井 憲治 ; 菊池 広人*; 高治 一彦*; 大沼 敏*

Hirai, Takashi; Tanai, Kenji; Kikuchi, Hirohito*; Takaji, Kazuhiko*; Onuma, Satoshi*

緩衝材に求められるオーバーパック支持性能や応力緩衝性能に関しては、「第2次取りまとめ」において、設定された仕様の人工バリアに対する安定性やオーバーパック作用応力の評価を行っている。しかし、設定された仕様の安全裕度や設計根拠については必ずしも明確ではない。そこで、安全裕度や設計根拠を明確にするために、人工バリアにおける緩衝材中でオーバーパックが変形する場合の作用荷重と変形の関係や破壊に至るような極限荷重が存在するかなどについて、縮小模型試験と解析を用いた検討を実施した。検討の結果、オーバーパックの円筒軸方向の変形の増加に対して、作用荷重の増加は減少する傾向にあるものの、周辺の岩盤など剛性の高い境界による緩衝材の拘束効果により明確な極限荷重は現れず、変形が大きくなれば変形量と作用荷重の関係を関数で近似できることが明らかになった。

The objective of this report is to clarify the characteristics of the bearing capacity of the buffer material against the deformation of the overpack in the engineered barrier system. In the second progress report by JNC, it was reported that the well designed engineered barrier system is stable and safety on mechanical support of the overpack to ensure stability and stress which acts on the overpack by some analysis. However, the degree of the capacity to the ultimate state and the background datas of the design are not necessary clarified in the report. Therefore it is considered to be mportant to assess the ultimate state and make the relationship clear between deformation and bearing capacity of the overpack in the engineered barrier system. So the scale test and the simulation analysis were carried out for the longitudinal deformation of the overpack in the saturated buffer material constrained by the host rock. From the result of the scale test and the analysis it appears that the bearing capacity is increasing with the deformation of the overpack even if the bearing capacity is over the yielding force and the relationship between deformation and bearing capacity can be approximately expressed by the simple fanction.

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