FIELD DATA ANALYSIS AND FUTURE PREDICTION METHOD OF MATERIAL DETERIORATIONS IN CUT-AND-COVER TUNNELS

開削トンネルにおける材料劣化の調査データの分析と将来予測に関する研究

In this paper, the authors have clarified the relationship between aging of subway cut-and-cover tunnels and rate of cracking that is caused by carbonation or chloride attack. First, field data analyses were carried out to characterize the material deterioration in the tunnels. Next, laboratory experiments were conducted to introduce a method of estimating the amount of corrosion products and the resulting expansion coefficient at the onset of cracking around a round steel. Finally, based on these findings, the statistical prediction method for material deteriorations was proposed and its usage in conjunction with numerical analyses was demonstrated. The proposed method is expected to be utilized for maintenance planning of tunnels, many of which were constructed about 40 years ago.　昨今，高度経済成長期に集中して整備された社会インフラの維持管理や更新が重要視されている．公共交通を支えてきた開削トンネルも40～80年の経年を迎えて，それらの維持管理に対する関心が高まっている．そこで本研究では，この際の補修数量を計画する指標となることを期待して，全国規模の将来予測シミュレーションを実施し，変状原因ごとに，経年とひび割れ発生割合の関係をまとめた．まず，現場調査データの統計分析から，開削トンネルにおける材料劣化の特徴を明らかにした．次に，室内試験から，腐食生成物に応じた丸鋼のひび割れ発生時の腐食量の算定手法を提案した．最後に，これらを用いた将来予測手法を構築して，それによるシミュレーション結果をまとめるとともに使用方法を示した．

• Record URL:
  https://doi.org/10.2208/jscejte.71.41
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=FIELD+DATA+ANALYSIS+AND+FUTURE+PREDICTION+METHOD+OF+MATERIAL+DETERIORATIONS+IN+CUT-AND-COVER+TUNNELS&author=T.+USHIDA&author=T.+NAKAYAMA&author=K.+Tsuno&author=K.+Shimamoto&author=S.+YAKITA&author=K.+TERADA&author=T.+KYOYA&publication_year=2015
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/21856575
• Authors:
  • USHIDA, Takashi
  • NAKAYAMA, Takashi
  • Tsuno, Kiwamu
  • Shimamoto, Keisuke
  • YAKITA, Shinji
  • TERADA, Kenjiro
  • KYOYA, Takashi
• Publication Date: 2015

Language

• English
• Japanese

Media Info

• Media Type: Web
• Pagination: pp 41-53
• Serial:
  • Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)
  • Volume: 71
  • Issue Number: 1
  • Publisher: Japan Society of Civil Engineers
  • ISSN: 2185-6575
  • Serial URL: https://www.jstage.jst.go.jp/browse/jscejte/-char/en

Subject/Index Terms

• TRT Terms: Carbonation; Chlorides; Cracking; Cut and cover tunneling; Deterioration; Maintenance; Subways
• Subject Areas: Bridges and other structures; Construction; Public Transportation; Railroads; I54: Construction of Tunnels;

Filing Info

• Accession Number: 01571476
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Jul 28 2015 4:01PM