本研究以堰塞壩體形成原因、破壞機制及其穩定性分析之文獻作為開端，再由瞭解邊坡斜面堆積土體與堰塞壩體的幾何參數在崩潰過程中隨時間之變化著手，深入進行系列性的實驗與探討。最終，可利用本研究導得之「連續崩潰流量模式」，適當地模擬堰塞壩體受溢流及滲流破壞時的崩潰流量變化；而在「堰塞壩體破壞實驗」中得到：三維堰塞壩體的崩潰峰流量來臨時間較二維堰塞壩體為快，且三維壩體在溢流前會先發生壩體內部之補注再行溢流；另外，當溢流水所受的阻抗增加時，則會以增加水深、提高位能並減低流速之方式對壩前土砂進行「壓力侵蝕」。而透過「河岸邊坡破壞實驗」，本研究進一步規納得到邊坡斜面堆積土體的崩壞過程與其堆 積型態、有無堰塞壩體之蓄水效應甚至堰塞壩形成初始型態間的關係。其中，本研究由該實驗結果提出「崖錐堆積轉化為穩定殘坡」之機制。 The effects of side slope soil body and nature dam's geometric parameter on the collapsing process of landslide dam is experimentally examined in this study. A“continual flow model of dam collapsing” is proposed to simulate the dam collapsing suitably caused by overtopping or pipping. According to experimental results, the peak discharge for 3-D dam collapsing comes earlier than that for 2-D dam collapsing. The talus deposits will transform into stable residual slope after side slope inclined stacking soil body collapsing by “the channel bank collasping ”.
