THE MULTIPLIED TUNNEL SUPPORT SYSTEM APPLIED TO SQUEEZING GROUND CONDITION

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  • KITAGAWA Shuzo
    社団法人 土木学会 基礎地盤コンサルタンツ (株)
  • KAJIWARA Yuzo
    社団法人 土木学会 日本鉄道建設公団企画室補佐
  • SHINJI Masato
    社団法人 土木学会 山口大学 工学部社会建設工学科

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  • 施工時差を考慮した多重支保工法の膨張性地山トンネルに対する適用
  • セコウ ジサ オ コウリョ シタ タジュウシホコウホウ ノ ボウチョウセイ ジヤマ トンネル ニ タイスル テキヨウ

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Abstract

To deal with the large deformation due to squeezing ground at the Iiyama Tunnel of the Hokuriku Shinkansen, the placement of the tunnel supports were taken into two phases. The idea of the different stages is based on two phenomena according to NATM theory. The first is the tendency of the earth pressure which allowing the lining to displace. The other is the effect of the closed shotcrete lining on the large earth pressure. From the trial excavation, we confirm that the displacement of the lining could be controlled by performing the thin secondary shotcrete layer, even after the first lining was yielded. The numerical analysis results show that the support system could be kept stable by placing the secondary lining at the distance of 3.5 times of the tunnel diameter from the tunnel face.

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