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堆積軟岩の長期挙動に関する調査試験研究(その3)

Investigation on time-dependent behavior of sedimentary rock (Phase 3)

山本 卓也*; 青木 智幸*; 城 まゆみ*

Yamamoto, Takuya*; Aoki, Tomoyuki*; Jo, Mayumi*

地下深部の堆積軟岩中に建設される地下施設の合理的な設計や施工・操業時の安全確保の観点から、空洞周辺岩盤の長期的な安定性を検討する必要がある。特に、堆積軟岩の時間依存性は未だそのメカニズムに不明な点が多く、重要な検討項目の一つであると考えられる。今年度は、これまでの研究で得られた知見の妥当性を確認しするとともに、平成17年度の地下施設建設に伴う地質環境変化予測の一環として、特に「ひずみの局所化」が生じた場合の空洞周辺岩盤中の掘削影響評価の考え方および支保等に与える影響を検討するための室内試験および解析評価を実施した

For the rational design of the underground facility and for the safety during construction and operation it is necessary to consider the long-term stability of the rock mass around a drift. Especially, the time-dependent behavior of sedimentary rock is important because the mechanism of time-dipenednt is not well understood. Here, laboratory tests of rock specimens collected from the borehole investigation and numerical analysis on the stability of the rock mass around a drift were discussed for last two years. In this year, additional laboratory tests were performed to confirm the several important knowledges for last two years. Moreover, the preliminary numerical analysis was carried out to predict the EDZ due to excavation of underground facility.

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