A PROPOSAL OF INFLUENCE ASSESSMENTS OF GROUND BY SECOND TUNNEL EXCAVATION BASED ON FIRST TUNNEL EXCAVATION DATA

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  • AOKI Koichi
    社団法人 土木学会 山口大学大学院 理工学研究科 博士後期課程
  • IWAI Katsuhiko
    社団法人 土木学会 財団法人高速道路技術センター
  • SAGA Masanobu
    社団法人 土木学会 日本道路公団四国支社 高松技術事務所 技術指導課
  • SHINJI Masato
    社団法人 土木学会 山口大学 工学部社会建設工学科
  • NAKAGAWA Koji
    社団法人 土木学会 山口大学 臨床トンネル工学研究所

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Other Title
  • I期線トンネルを考慮したII期線施工時における影響予測法の提案

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It is necessary to prevent the first stage tunnel to be at minimum level of the influence when the adjoined second stage tunnel is being excavated. Although many examples of the prediction of the influence have been performed by numerical analyses, it is still difficult to evaluate the whole tunnels in respect of time and cost. A method for obtaining the size of plastic zone surrounding the two tunnels was presented in this paper. The safety of the tunnel construction may be judged by the occurrence of the plastic zone created at each stage of the tunnel construction. Moreover, construction method, support system, and management system for the second excavated tunnel can be designed by considering the plastic zone influence of the first excavated tunnel.

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