本文研究潛盾隧道於地層中之受震行為，土壤剪力波速為衡量地盤之重要指
標，在地震作用之下，土壤與潛盾隧道會產生互制行為，本研究使用三向度有限
元素法軟體PLAXIS-3D 分析，並搭配其軟體中之硬化土壤小應變模式，再根據
剪力波速為變數計算土壤各項參數。計算過程中先模擬潛盾靜態開挖之流程，再
於模型底部施加隧道縱向之地震力，並根據其計算之軸力、彎矩歷時，分析其環
片結構受震下之內力。
由於潛盾隧道存在之土層通常為不均質之土層，為了解不同土層交界面對隧
道受震行為的影響，本研究使用不同的地層剪力波速為變數，先探討單一剪力波
速之土層，隧道在不同地層剪力波速下之受震行為，再將地層一半以上設定為地
層剪力波速很小之軟弱土層，以上方為軟弱土層，下方為不同剪力波速之地層，
探討其上層與下層剪力波速之間的差距，以及交界面於隧道之位置(軟弱土層涵
蓋的範圍)對於隧道受震的影響，分析結果顯示，土層之交界面在受震下之行為
會產生類似剪切之行為，導致相較於單一土層之地層，隧道結構內力會有放大之
效果。

The purpose of this thesis was to study the seismic behavior of shield tunnel. Shear
wave velocity is an index to measure the hardness of the ground. Under the action of
earthquake, soil and shield tunnel will interact. In this study, the three-dimesional finite
element method software PLAXIS-3D was used, and the HSS model was used for soil
behavior. The shear wave velocity was used as a variable to calculate the soil parameters.
In the analysis process, the static excavation of shield tunnel was simulated first and
then the records of acceleration was applied at the bottom of the model, propagating
vertically upward. According to the result of axial force and bending moment, the
internal force of the lining under the earthquake is analyzed.
Since the soil layers which shield tunnel situated would usually have different
shear wave velocities. In order to understand the influence of the interface of different
soil layers on the seismic behavior of the tunnel, this study uses different shear wave
velocities as varaiables. First to discuss the seismic behavior of the tunnel between
different shear wave velocities of soil layer with a single shear wave velocity model.
Then about half of the layer is set as a weak soil layer with a small shear wave velocity,
the upper layer is a soft soil layer, and the lower layer is a layer with different shear
wave velocities, and the ratio between the upper and lower shear wave velocities would
affect the tunnel seismic behavior. The position of the interface relative to the tunnel
V
(the range covered by the soft soil layer) affects the tunnel on the earthquake. Results
show that abrupt changes of shear strain occur at the interface between the soil layers
under earthquake. Compared with the single soil layer, the internal force of the tunnel
lining will be amplified.

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