The Centrifuge Modeling on the Tunnel Uplift in Liquefiable Soil under Different Base Input Motions

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Title:	The Centrifuge Modeling on the Tunnel Uplift in Liquefiable Soil under Different Base Input Motions
Authors:	杜志談;Tam, Do Chi
Contributors:	土木工程學系
Keywords:	離心機模擬;隧道隆起;液化土;阿里亞斯強度;Centrifuge modeling;Tunnel uplift;Liquefied soil;Arias Intensity
Date:	2024-07-31
Issue Date:	2024-10-09 14:50:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	由於目前的上浮預測方程式有其限制，物理模型耗時，數值模型的適用性受限，因此在液化土壤中覆蓋隧道上浮的研究已成為一個重要課題。本研究通過五個在 50 倍人工重力下進行的離心模型試驗來模擬嵌入飽和砂土中的矩形隧道的地震反應。結果顯示，隧道上浮主要受Arias強度的影響，並表明兩者之間存在強相關性，而其他指標如峰值地面加速度、峰值地面速度、峰值地面位移和累積絕對速度則與隧道上浮無相關性。此外，本研究還考察了矩形隧道在不同輸入運動下在液化土壤中的反應，包括最大地表位移、矩形隧道內傾斜破壞面的角度、隧道旋轉角度、隧道上浮、安全係數的變化、傳感器位移及液體流動的形成。研究結果強調了將Arias強度與上浮之間的關係納入預測方程式中的重要性。這一創新的方程式可以作為工程師的基準，為預測上浮提供參考。此外，本研究還增強了對在不同輸入運動下矩形隧道動態行為的理解;The investigation of the cut-and-cover tunnel uplift in liquefiable soil has become a significant concern due to the limitations of current uplift prediction equations, time-consuming physical models, and restricted applicability of numerical models. The study of 5 centrifuge tests at 50 g artificial gravity is conducted to simulate the seismic response of a rectangular tunnel embedded in saturated sandy soils. The results revealed that the tunnel uplift is primarily influenced by Arias Intensity and indicated a strong correlation, unlike other indices such as peak ground acceleration, peak ground velocity, peak ground displacement, and cumulative absolute velocity which showed no correlations with tunnel uplift. Moreover, the responses of a rectangular tunnel in liquefiable soil under different input motions such as maximum ground surface displacement, the angle of inclined failure surface in a rectangular tunnel, tunnel rotation angles, tunnel uplifting, variation of safety factor, sensor displacement, and formation of fluid flows were also examined. The findings highlight the significance of incorporating the relationship between Arias Intensity and uplift into a prediction equation. This innovative equation can serve as a benchmark for engineers, offering a reference for predicting uplift. Additionally, this study enhances the understanding of the dynamic behavior of the rectangular tunnel subjected to various input motions.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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