邊坡因降雨量及地下水滲流導致崩塌，本研究以Hong(2017)所推導之邊坡破壞理論公式，透過室內試驗，包括夯實試驗、達西定律之K值試驗、壓密排水三軸試驗，獲取理論所需參數，再帶入邊坡破壞理論公式，計算發生崩塌之臨界地下水位。研究結果可推得臨界地下水位與坡面高度關係圖，當斜坡坡度等於內摩擦角，無水深仍會產生滑動，並推出臨界水深與斜坡高度相同之斜坡角度，提供相關實務設計監造及安全監測應用之參考。 Hillslope usually collapses due to rainfall and groundwater seepage. This study uses the theoretical formula of slope failure derived from Hong (2017). Laboratory experiment, including the compaction test, the K value test of Darcy's law, and the compaction drainage triaxial test were executed to obtain the parameters in theoretical equation, which can calculate the critical groundwater level where the collapse occurs. The results of the study can be used to derive the relationship between the critical groundwater level and the slope height. When the slope is equal to the internal friction angle, the water-free depth will still produce slippage, and the slope angle with the same critical depth and slope height will be introduced to provide relevant practical design supervision and safety. This study can be applied in the environmental monitoring of landslide.
