由於台灣山地約佔總面積之75%，邊坡崩塌事件頻繁，因坍方造成之災害時有所聞，因此不得不審慎做好邊坡穩定分析與護坡工程型式之選擇，以維護公眾生命及財產安全。本研究使用國內工程界常用之邊坡穩定分析程式STEDwin 2.64針對台灣北部地區之某路工段工程案例做簡化分析，先搜尋出其潛在滑動面，再利用Liang (2002)發表之程式UA Slope 2.1分析出一系列包括邊坡環境因素及擋土樁配置因素對於邊坡安全係數之影響，以提供未來工程實務中在擋土樁在邊坡工程中之施工參考。
本研究分析結果顯示，邊坡剖面之幾何形狀、崩積土層厚度、地下水位高度、鑽掘樁樁徑、鑽掘樁樁間距、樁徑與樁間距之比值及鑽掘樁安置位置，皆會對安全係數造成不同及或多或少的影響，其中以相同邊坡剖面之幾何形狀做分析時，鑽掘樁安置位置對邊坡安全係數之影響最為顯著。

The mountains accounted for 75% of land area of Taiwan, so slope failure occurs frequently. Therefore, we must do our best to analyze the stability of slope and to choose the slope protection measure so that we can ensure people’s safety against accidents and financial losses. This research conducts a series analysis on hypothetical cased that are developed according to a colluvium soil slope case along a highway in northeastern Taiwan. First, the potential slip surface is searched using the commonly used slope stability program STEDwin 2.64. Then, the computer program UA Slope 2.1 newly developed by Liang (2002) is used to study the effect of the influencing factors on safety factor, including slope environment factor and drilled shaft factor.
The analytical results indicated that the geometric of slope, the depth of colluvium layer, the height of groundwater level, the diameter of drilled shaft, the spacing of drilled shaft, and the position of drilled shaft affect the safety factor to different degree. For the same geometric of slope, the position of drilled shaft has the most significant influence on the factor of safety.

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