研究生: |
陳秉睿 Pin-Jui Chen |
---|---|
論文名稱: |
以三維數值分析初步探討潛盾隧道在不同剪力波速地層中之受震行為 Preliminary studies on the seismic behavior of tunnel in soil layer with different shear wave velocity using three-dimensional numerical analysis |
指導教授: |
陳堯中
Yao-Chung Chen |
口試委員: |
陳希舜
Shi-Shuenn Chen 陳堯中 Yao-Chung Chen 陳韋志 Wei-Chih Chen |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2021 |
畢業學年度: | 109 |
語文別: | 中文 |
論文頁數: | 202 |
中文關鍵詞: | 數值分析 、潛盾隧道 、剪力波速 、勁度比 、受震反應 |
外文關鍵詞: | Numerical Analysis, Shield tunnel, Shear wave velocity, Stiffness ratio, Seismic response |
相關次數: | 點閱:418 下載:8 |
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地層剪力波速是衡量地盤特性之指標,實務上沿著隧道行進方向,可能發生地層剪力波速急遽變化。由文獻得知,勁度均勻之潛盾隧道前後段進入不同剪力波速地層,會發生受震反應不同之情形,使單一地震施予隧道不同強度作用力並造成負面影響。本研究將潛盾機開挖過程納入模擬,並考量土壤與結構互制作用,以地層與隧道勁度比定義不同剪力波速地層中隧道受震之彎矩變化,並延伸分析潛盾隧道對不同剪力波速地層之影響特徵,以初步探討潛盾隧道在不同剪力波速地層中之受震行為。
本研究應用三維有限差分數值軟體FLAC3D靜態及動態完全非線性模擬,先模擬潛盾工法施工輪進建立隧道模型,再將單一地盤假定成比例變化之剪力波速,並個別施加兩種不同大小且垂直隧道軸向之水平地震力,再建立無隧道模型與隧道模型相比較。
分析結果顯示:(1) 不同剪力波速地層會改變潛盾隧道之存在對土層及地表建物的影響程度,其中可分為剪力波速直接影響與峰值加速度主導的間接影響。(2) 勁度比對潛盾隧道受地震力作用的影響程度極大,在實務上設計隧道襯砌時,應避免全以提升勁度的方式作為耐震設計。
關鍵字:數值分析、潛盾隧道、剪力波速、勁度比、受震反應
Shear wave velocity is an index to measure the hardness of the ground. In practice, along the longitudinal direction of shallow tunnel, sharp transitions in shear wave velocity of ground may occur. This study considers the interaction of soil and structure, and the stiffness ratio of ground and tunnel is used to define the influence of tunnel moment under earthquake. Preliminary analysis of the impact of shield tunnels on ground with different shear wave velocity, and the seismic behavior of shield tunnel in ground with different shear wave velocity.
In this study, the 3D FDM software FLAC3D was used for static and dynamic fully nonlinear simulations. Simulate excavation first, then set different shear wave velocity at the ground, and input two shear waves with different peak accelerations for comparison.
According to the results of numerical analysis, the following conclusions can be obtained: (1) Different shear wave velocity will affect the impact of shield tunnels on soil and surface structures, which can be divided into direct effects and indirect effects dominated by peak acceleration. (2) The stiffness ratio has a great influence on the seismic force of the shield tunnel. When designing the tunnel lining in practice, the method of increasing the stiffness of the lining can’t be the only method of seismic design. Keyword: Numerical Analysis, Shield tunnel, Shear wave velocity, Stiffness ratio, Seismic response.
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