本研究為對台20線選定之兩場址，進行淺層邊坡監測，兩場址分別埋設土壤吸力計、土壤水分探測計、傾斜管、雨量觀測計。每個月至監測現場蒐集監測資料及檢查儀器運作。
文中將蒐集之土壤之基質吸力與體積含水量繪製對應之變化關係，並用不同的土壤水分特性曲線模型，利用數值分析軟體MATLAB求取其對應關係之模式參數，以獲取非飽和土壤之土壤水分特性曲線。進而使用ABAQUS有限元素分析軟體，對於邊坡進行降雨後的含滲流之穩定分析，以了解非飽和土壤邊坡之穩定機制。
在分析監測之土壤之基質吸力與體積含水量，文中使用四個不同的土壤水分特性曲線方程式進行耦合，對於監測值皆有良好的耦合效果。另外，根據ABAQUS分析軟體與監測之結果顯示，表層的邊坡土壤於降雨後體積含水量上升，而基質吸力隨之下降，邊坡於淺層發生滑移的情形，待降雨停止後，基質吸力逐漸回升，此與非飽和土壤之理論相符。藉此了解推論監測系統與數值模擬非飽和土壤淺層邊坡於降雨後之穩定行為。

In this study, two shallow slope sites had been chosen at Tai-20, to install the monitoring equipment. The soil tensiometer, soil moisture sensor, rain gauge, and inclinometer were installed in these sites. The monitoring data was collected, and the sensors were checked monthly.
The relationship of matric suction and volumetric water content can be fit the soil water characteristic curve by the numerical software, MATLAB, in this study. The finite element analysis program, ABAQUS, is used for seepage and stability analysis of the unsaturated slope using the soil water characteristic curve.
The fitting result of the relationship between the matric suction and volumetric water content is well agreement with four difference soil water characteristic curve models. Both the numerical analysis and monitoring results show that the volumetric water content of the shallow slopes increased, and the matric suction of shallow slope decreased significantly after rainfalls. The matric suction gradually recovered after cessation of rainfalls. Sliding of the shallow slope begins to occur when the matric suction is decreasing. The monitoring system and the numerical analysis are able to interpret the behavior of the shallow slope after rainfalls.

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