一般認為深層崩塌是因為地下水位快速上升所造成，為了解深層崩塌與地下水位之關係，本研究採用九份二山堰塞湖邊坡之中值粒徑大小為試驗用砂，採用均勻粒徑，於砂箱設計不同坡度之邊坡，透過橫向及向上滲流提高邊坡之地下水位；試驗中記錄了崩塌發生過程中之地下水位變化，並以即時錄影來記錄崩塌發生時土石移動之過程，未來可透過物理模式，討論發生深層崩塌之成因及機制，提供深層崩塌物理模式之發展依據。

Generally speaking, deep seated landslide is caused by the fast rising of groundwater level. For the understand of the relationship between groundwater level and deep seated landslide, this study adopted the medium size of dammed lake in Chiufenerhshan as the sand of laboratory experiment to set up several slopes in the sand box. The seepage flow was forced into the slope by lateral/upward direction, so as to rise the groundwater level. The groundwater level fluctuation was recorded during the period of deep seated landslide. The instant recording of soil movement during the experiment was also executed. Finally, the cause and the mechanism of deep seated landslide was discussed based on the physical model. In other words, the outcome of this study can be the basis of physical model.