2017-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/707943摘要：近年來全球氣候變遷，極端降雨發生頻繁，常常辦隨洪水災害，造成人民生命財產損失。本研究計畫承續去年纖維加勁土壤單元之研究成果，今年將以物理模型試驗，探討纖維加勁土堤受滲流作用下之力學行為，並綜合評估纖維含量、長度與土壤粒徑分佈對土堤滲流、變形量與穩定性之影響。本研究也將探討纖維加勁土壤的鋪設厚度與鋪設位置對土堤在滲流作用下的影響。試驗過程，將以土壤水分計與孔隙水壓計量測土壤含水量與孔隙水壓的分佈與變化。此外，本研究也將透過質點影像測速儀(Particle image velocimetry, PIV)與影像處理法，分析與計算土堤在滲流作用下之變形量，並探討其破壞模式(如邊坡破壞或是土壤管湧或內部沖蝕破壞)。最後，本研究將對試驗結果進行數值模擬與驗證，利用數值分析計算土堤安全係數與其穩定性隨時間之變化。在驗證完成後，本研究也將進行一系列數值參數分析，用以發展在不同土壤與纖維參數組合下之最佳設計方法。本研究成果可應用於水工構造物的設計、修復與補強，對於氣候變遷，颱風豪雨作用下，有效控制水工構造物內土壤滲流與管湧破壞，增加其穩定性與安全性，以達到永續安全家園的最終目標。<br> Abstract: Because of the influence of global warming and El Nino in recent decades, the frequency and magnitude of extreme weather events has increased dramatically, which have caused severe flood disasters and subsequently affected many people and their properties. Expanding the research on fiber-reinforced soil in previous year, experimental model tests will be conducted in this year to investigate the mechanical behavior and stability of fiber-reinforced soil embankment subject to seepage. The effect of fiber content, length and soil grain size distribution on test seepage within embankments and deformation and stability of embankments will be evaluated. The distribution and variation of soil water content and porewater pressure will be monitored. Furthermore, the deformation and failure mode of embankments subject to seepage will be revealed using Particle image velocimetry (PIV) method. Last, numerical analyses will be performed to estimate the factor of safety of embankments. A series if parametric study will be conducted to identify the optimal combination of soil and fiber. In the context of disaster mitigation, the research results can be directly applied to the engineering projects, involving design and repair of river levees, earth dams, and river bank restoration, for controlling seepage within those waterfront structures effectively. The ultimate goal is to mitigate the typhoon or heavy rainfall induced damage or collapse of hydraulic infrastructures and to achieve a sustainable and safe homeland.纖維加勁土壤土堤防災Fiber-reinforced soilSoil embankment testDisaster mitigation