書誌事項
- タイトル別名
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- ANALYTICAL SUDY ON THE EFFECT OF PRE-GROUND IMPROVEMENT METHOD DURING SHALLOW TUNNEL EXCAVATION IN SANDY GROUND
抄録
During the construction of the Tohoku and the Hokuriku Bullet Train lines, several shallow tunnels were excavated in unconsolidated grounds using the New Austrian Tunnelling Method (NATM). In order to prevent settlements of ground tunnel and to ensure the stabilization of the cutting face of the tunnels, ground improvement was carried out in the above-mentioned fields. In the construction areas where the aboveground parts were unrestricted, the ground around the tunnels was improved by mixing in cement before the tunnel excavations; and thereafter, the tunnels were excavated using NATM. Various combinations of improved areas and levels of strength were tried in the fields, and the tunnels were excavated successfully. However, the mechanism of the effect of the ground improvement method and the influence of the improved strength, depth and width of the improved areas are not clearly understood.<br> In this study, 2D elasto-plastic finite element analyses are carried out to clarify the mechanism of the ground improvement method. The results of the numerical studies indicate that the ground improvement method used here can effectively prevent the settlement of the ground, as well as the settlement of the crown and the foot to the tunnel, by reinforcing the ground around the tunnel, and that the method becomes even more effective when the width of the improved areas are increased.
収録刊行物
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- 土木学会論文集Ｆ１（トンネル工学）
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土木学会論文集Ｆ１（トンネル工学） 68 (3), I_27-I_37, 2012
公益社団法人 土木学会
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詳細情報 詳細情報について
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- CRID
- 1390282680333684096
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- NII論文ID
- 130004559965
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- ISSN
- 21856575
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可