SEISMIC ISOLATION EFFECT FOR TUNNEL WITH SOFT ISOLATION LAYERS

• SHIMAMURA Sadao

  JAPAN SOCIETY OF CIVIL ENGINEERS

• KASAI Hiroshi

  JAPAN SOCIETY OF CIVIL ENGINEERS

• HARUUMI Masakazu

  JAPAN SOCIETY OF CIVIL ENGINEERS

Bibliographic Information

Other Title

• 免震層による矩形断面トンネルの横断方向に対する免震効果
• メンシンソウ ニ ヨル クケイ ダンメン トンネル ノ オウダン ホウコウ ニ タイスル メンシンコウカ

Abstract

This paper describes seismic isolation effects of soft layers installed directly around a rectangular shape tunnel and placed beside the tunnel as vertical walls. 2D-FEM analyses with different properties and arrangements of the soft layers and the ground were conducted. The results show that the soft layers can restrict propagation of shear forces effectively; the layer directly around the tunnel with shear modulus of 1/100-1/1, 000 of the ground can decrease the section forces due to earthquakes to half of the case without the layer. In cases with the 10cm and 30cm thick soft layers installed besides the tunnel as vertical walls. the section forces due to earthquakes can be reduced to 60-70% and 40-50%, respectively, of the case without the layers.

Journal

• Doboku Gakkai Ronbunshu

  Doboku Gakkai Ronbunshu 1999 (626), 27-36, 1999-07-21

  Japan Society of Civil Engineers

Keywords

• seismic isolation
• earthquake
• tunnel
• 2D-FEM analysis
• shear modulus
• section force

Details

• CRID: 1390282680286707840
• NII Article ID: 130003983319
• NII Article ID: 10002531095
• NII Book ID: AN10014020
• DOI: 10.2208/jscej.1999.626_27
• ISSN: 18827187
• ISSN: 02897806
• NDL BIB ID: 4819201
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4819201
• Web Site: https://www.jstage.jst.go.jp/article/jscej1984/1999/626/1999_626_27/_pdf
• Data Source:
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  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed