Retrogressive sliding can be observed in groundwater-induced landslides. The major inducing factor of this phenomenon is the fluidization in the down-hillslope and the soil of the bottom-layers. Moreover, when the water content in the area around the groundwater input pipe surpasses 29%, sag in the upper soil layer can also occur. As the groundwater discharge increases in experiments with the same slope, the equilibrium time needed to achieve landslide equilibrium gets shorter and the durations of landslides also decrease. As the slope in experiments with the same level of groundwater discharge increases, the equilibrium time required to achieve landslide equilibrium gets shorter, the landsliding area in a specific time period gets larger and the total landsliding area also decreases.由地下水誘發自由端邊坡滑動現象，崩塌型態屬於後退型崩塌。主要誘發因子為滲透水分造成下層土壤流動化及地下水輸入管鄰近區域因土壤土體底層水分飽和度超過29%而產生土壤下陷現象。在相同坡度的邊坡滑動實驗中，地下水量越增加，達到邊坡滑動平衡的時間越短且發生滑動次數越少；而在相同輸入地下水量的邊坡滑動實驗中，坡度越增加則達邊坡滑動平衡時間越短、有越高比例的滑動面積集中在特定時段，且總滑動面積也會因此減少
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