The dip-slope Chiu-fen-erh-shan landslide, estimated to have a volume of 36 × 10⁶ m³, was triggered by the Mw 7.6 Chi-Chi earthquake. The debris covered an area of 1.95 km² and claimed 36 lives. Although different discrete element methods have been applied to simulate the postfailure behavior of the Chiu-fen-erh-shan landslide in the last two decades, the lateral and dip-slope rock movements, the impact of the sliding debris against the hill in front of the slope toe and its final deposition have not been fully simulated. The major objective of this study was to investigate the possibility of applying three-dimensional (3D) numerical modeling code 3DEC to numerically model the debris movement and deposition of the Chiu-fen-erh-shan landslide under the impact of the Chi-Chi earthquake. By incorporating the spacing and orientation information of the joints and bedding planes, the slope was modeled as an assemblage of polyhedrons. Seismic ground motions were simultaneously applied in three dimensions. The shoveling effect was considered to erode the hill in front of the slope toe so as to extend the impact area and match more closely actual depositional topography. This study showed that the 3DEC simulations captured essential 3D characteristics of the landslide and resulted in a postfailure configuration similar to that observed in the field.

Chiu-fen-erh-shan山倾坡估计为36×10 ⁶  m ³，是由Mw 7.6 Chi-Chi地震引发的。碎片覆盖了1.95 km ²的区域夺走了36条生命 尽管在过去的二十年中，已经采用了不同的离散元方法来模拟潮峰山滑坡的破坏后行为，包括横向运动和倾斜坡运动，滑动碎屑对山前山坡的影响。坡脚趾及其最终沉积尚未得到完全模拟。这项研究的主要目的是研究在Chi-Chi地震的影响下应用三维（3D）数值建模代码3DEC对Chiu-fen-erh-shan滑坡的泥石运动和沉积进行数值模拟的可能性。通过结合节理和层理平面的间距和方向信息，将坡度建模为多面体的组合。同时在三个维度上应用了地震地震动。铲土作用被认为侵蚀了坡脚趾前的山丘，从而扩大了影响范围并更接近实际的沉积地形。这项研究表明，3DEC模拟捕获了滑坡的基本3D特征，并导致了类似于野外观察到的失效后构造。