本研究利用STABL與PLAXIS模擬分析邊坡之穩定性，由於颱風豪雨及地震等自然 災害的影響，國內邊坡崩壞頻傳，為了解邊坡破壞之原因與尋求解決之方法，以九份地 區鄰近九份國小和阿里山五灣仔為研究對象，蒐集歷年災害資料與現地調查資料，並探 討兩地區之邊坡穩定性。邊坡穩定分析常運用極限平衡法，其因可快速得到一潛在滑動 面與安全係數，且假設簡單不用考慮土壤實際行為；相較之下，有限元素法則可求得邊 坡位移量、應力場變化及塑性區位置，並可運用折減係數法求得土體安全係數。最後探 討兩種方法(極限平衡法、有限元素法)之安全係數差異性，若分析過程加入監測系統數 據，則可更清楚分析邊坡之穩定性。

This study used the limit equilibrium methods(LEM) and finite element methods(FEM) to simulate the slope stability. Because of the rainfall of typhoons and earthquakes, the slope sliding disasters frequently occurring in Taiwan. To understand the mechanism of slope failures and look the way dealing with the solvent. Collecting the disaster data and field survey data for the calendar year, discussion on the slope stability of the two regions and compared each other at Jiu-Fen and Woo-wan-Tsai Area, Mt. Ali Road for the study. The LEM is usually used in slope stability analysis. It can find potential sliding surfaces and safety factors rapidly, assuming simple regardless of soil actual behavior. In contrast, the FEM can find a slope displacement and stress field variation and plastic zone locations, may reduction in soil strength parameters, and to obtain factor of safety. Finally, comparing the safety factors with two methods. If we combine the two methods (LEM and FEM) using monitored data in the field, we can analyze slope stability clearly.