國內與邊坡穩定相關之規範多以整體安全係數作為考量之依據，但因並未詳細要求安全係數之分析過程，每當發生災害時，便容易由此產生爭議。傳統用於分析上的極限平衡法可快速得到一潛在滑動面與安全係數，至今仍為工程界所信賴，但因切片法各有不同假設，使用時需仰賴工程師本身之經驗與素養判斷。本文採不同商用程式、切片法與搜尋方法，針對不同實際案例與設計邊坡進行一系列之極限平衡法分析。以43組簡單設計邊坡、自然邊坡與土石壩案例，指出分析過程之注意事項，並就造成不確定性之三種因素作探討。 研究結果顯示，分析圓弧滑動面時，商用程式有最明顯的影響效果，搜尋方法次之，而切片法造成之影響最具規律而得以預測；分析非圓弧滑動面時，則須考慮搜尋方法與切片法對該案例之適用性，篩選掉異常條件後再行討論。 ;The norms related to slope stability in Taiwan are generally based on the overall factor of safety, but the analysis process for safety factor is not required in detail. Whenever a disaster coming, it is easy to be controversial. Conventional limit equilibrium method for analysis can quickly get a potential surface and factor of safety. It’s still trusted by the engineering community. Engineers need to rely on their experience, because these methods of slices have different assumptions. In this paper, a series analysis for 43 cases by limit equilibrium method. Different commercial program, search method and method of slices are used to analyze simple slopes, natural slopes, and embankment dam. Points out the emphasis of the analysis process, and discusses the three factors that cause the uncertainty. The results show that the commercial program has the most significant effect on the analysis of the circular sliding surface, and search method is second. The influence of the slicing method is the most regular and predictable. When analyzing the non-circular surface, applicability of search methods and method of slices for the case needs to be considered.
