破壞面發生於非飽和土層之淺層邊坡破壞為最常見之邊坡破壞類型，常造成重大生命財產損失，現有之邊坡破壞預警模式是以雨量監控為指標之經驗法，為提高預警之準確性及時效性，本研究以解析法進行非飽和無限邊坡穩定分析，並發展一操作簡單且低成本之單剪試驗儀，以較符合現地邊坡破壞之應力狀態之非飽和土壤單剪試驗，求取土壤非飽和強度參數，搭配水力力學耦合試驗系統模擬雨水入滲淺層邊坡引致邊坡破壞實驗，實驗過程使用土壤水分感測元件，觀察降雨入滲試體之情況，觀察非飽和因水入滲造成土壤含水量變化與基質吸力變化對於邊坡穩定性影響，以元素模型試驗結果進行入滲引致非飽和淺層無限邊坡破壞理論之驗證，結果顯示本研究所發展之分析架構可預測邊坡依時性反應，具有可用於場址客製化具依時性特性之淺層邊坡破壞預警系統架構之潛力。

Shallow landslides that failure surfaces occurred on unsaturated soil have been a serisous issue nowadays. To improve the limiations of rainfall-based slope warning system that based on empirical correlations of case histories, a rigorous method that integrates the coupled hydro-mechanical analysis of an unsaturated slope is under development. The rigouous analysis will be used to develop an innovative framework for a customized, time-dependent warning system for shallow slide failures triggered by rainfalls. This study developed a low-cost, unsaturated direct simple shear test apparatus and used it to determine the unsaturated strength parameters for coupled hydro-mechanical analysis of an infinite slope subjected to shallow failure from infiltration. A physical element test that simulated the field stress and hydraulic conditions was performed to verify the theory for the infinite slope case. Soil moisture sensors were embedeed in the element test to measure the infiltration process and coupled with stress conditions and variations of strength in the unsaturated sample. Comparisons between the prediction and result of pyhsycial modeling show that the rigorous analsyis can rationally predict the time-dependent shallow landslideprocess. The potential of developing a customized, time-dependent warming system for shallow slide failure is promising.

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