近年來大規模邊坡破壞發生頻繁，在破壞時往往伴隨大量的土石在數十秒內滑動，造成災害。本研究利用大規模崩塌數值模擬，探討其滑動歷程以及影響範圍，期能在未來有助於劃定大規模邊坡破壞潛勢區滑動影響範圍。本研究中有兩個案例：中國茂縣新磨村邊坡破壞以及台南175縣道南勢坑地滑區。模擬中透過建構三維數值模型、不連續面切割來模擬現地地形與滑動塊體的堆疊，最後探討新磨村邊坡破壞的崩塌歷程，以及預測南勢坑地滑區崩塌後的影響範圍。
本研究所使用的是屬於分離元素法(Distinct Element Method, DEM)的3 Dimensional Distinct Element Code (3DEC)軟體。模擬時透過給定重力以及連續面摩擦角的改變來模擬塊體滑落。新磨村邊坡破壞模擬結果顯示在數值模擬時必須考慮塊體高速滑動時會產生不連續面摩擦角降低的自潤效果；此外，新磨村上方的塊體會明顯影響塊體的行為與堆積。南勢坑地滑的模擬結果則顯示該地區若發生滑動，將歷時大約30秒左右，在南勢坑溪中堆疊岩塊的影響長度可達390公尺，堆積高度則有30公尺。

Large-scale rock avalanche has occurred frequently in recent years. A large amount of sand and stone slide only in tens of seconds causing disasters. This study simulate the large-scale rock avalanche by using numerical simulation to explore its sliding history and its impact range. Help to delineate the impact potential area in large-scale rock avalanche in the future. There are two cases in this study: the Xinmao Landslide, which occurred in Xinmo Village, Mao County, China, and the Nan-Shi-Keng, which is located at 175 County Road in Tainan. In the simulation, a three-dimensional numerical model will be built and cut the discontinuous surfaceto simulate the stacking of the local terrain and the sliding block. Finally, discussing the landlside process of the slope of Xinmo Village, and predicting the impactrange of the Nanyukeng Landslide.
The three Dimensional Distinct Element Code (3DEC) software belonging to the Distinct Element Method (DEM) was used in this study. During the simulation, the block slip simulate by a given gravity and a change in the different friction angle in the joints. The simulation results of the landslide damage in Xinmo Village show that it is necessary to consider the self-lubricating effect of the friction angle reduction in the simulation when the block is sliding at high speed. In addition, the block above the Xinmo Village will significantly affect the behavior and accumulation of the simulation. The simulation results of the Nan-Shi-Keng sliding show that if the sliding occurs in the area, it will take about 30 seconds, and the stacking rock in the Nan-Shi-Keng River will have a temporary dam with 390 meters long and of 30 meters height.

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