著者

高橋 浩 谷井 敬春 石松 辰博 進士 正人 中川 浩二

出版者

公益社団法人 土木学会

雑誌

トンネル工学研究発表会論文・報告集

巻号頁・発行日

no.12, pp.45-52, 2002

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In the construction of tunnel in squeezing rock, where the creep is taking a part, there is a need to consider about the displacement occur on the primary support. It is necessary to place the lining because the existence of long-time convergence. At the present, the design of the lining, the handling of the primary support, the design load in such ground condition above, have not established yet. In this paper, authors proposed the new consideration of total load acting on the lining from viewpoint of life cycle cost minimum in consideration of long-term degradation of the primary support strength and the ground.

著者

谷井 敬春 廣田 政矢 菊地 裕一 釜谷 薫幸 高橋 浩

出版者

Japan Society of Civil Engineers

雑誌

トンネル工学研究発表会論文・報告集 (ISSN:18849091)

巻号頁・発行日

vol.12, pp.297-302, 2002

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A large-scale collapse occurred when the face reached about 900m point from the east portal. Soil from collapse containing cobble gravels became an avalanche with a large amount of water, and has surged to the portal. Ground surface of 130m from collapse point was caving like Crater. These was no human damage and a little material damage though it was such a huge disaster. Countermeasures are as follows, caving area was restored with air-mortar, boring was done for drainage from the tunnel, grouting was done right under the collapse area. The tunneling work was completed from the record-breaking collapse two years later.