本研究嘗試藉由現場監測土壤在暴雨下水分變化情形探討邊坡滑移之行為，針對台20線道路邊坡進行土壤表層體積含水量、基質吸力以及邊坡相對位移監測，繪製土壤水分特性曲線，以了解其相互之間關係，並利用有限元素分析軟體ABAQUS，進行滲流分析。
本研究於台20線選定兩處場址，於此二場址埋設土壤水分探測計、土壤吸力計、雨量觀測計、邊坡相對位移計與資料擷取器，於固定時間前往監測場址收集監測資料，並依此進行初步分析研究。
研究監測結果與數值軟體分析結果顯示，邊坡表層土壤的基質吸力在降雨之後明顯下降，並在降雨停止後逐漸回升，且邊坡表層在基質吸力下降階段發生滑移現象，與非飽和土壤理論相符。依此可推斷本研究所建立之監測系統可真實的監測邊坡位移與基質吸力之間的關係

In this study, vertical array sensors are used to monitor the change of the soil moisture to investigate the behavior of sliding of soil slope. The matric suction, volumetric water content and the relative displacement of the slope of Tai-20 are monitored to understand their mutual relations. The finite element analysis program, ABAQUS, is used for seepage analysis.
In this study, two sites had been chosen at Tai-20 roadway. The soil moisture sensor, soil tensiometer, rain gauge, the slope relative displacement meter and the datalogger were set in these sites. The monitoring data was collected to analyze and study for a period of time.
Monitoring and numerical analysis results show that the matric suction of slope decreased significantly after rainfall, and gradually recovered after the cessation of rainfall. Sliding of the slope surface occurs when matric suction is decreasing, which is consistent with the theory of unsaturated soil mechanics. According to this study, the system is able to monitor the relation of matric suction and displacement accurately.

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