鋼管排樁工法在防治土石流及崩塌地之應用

The Application of Steel Pipe-Wall method to Curb the Happening of Debris Flow and to Control Landslide Area

許聖富(Sheng-Fu Sheu)

《水保技術》 9卷4期 (2014/11) Pp. 1-7

摘要

本文首先說明如何以「鋼管排樁工法」抑制土石流發生及整治崩塌地之具體作法，並以三個工程案例簡要說明鋼管排樁工法在崩塌地防治上之概念應用。其次扼要解析地表逕流水深、不安定層厚度、臨界水力坡降等參數，對可能啟動土石流發生的啟動機制，以及促使土石流發生的「啟動臨界點」及「起始潰散點」概念；並以三種基岩層情境進行初步模擬及RIDO計算例，說明鋼管排樁之受力及變位情形；另建議採用「大口徑鋼管鑽探工法」配合傳統鑽探取樣作業，以完整取得崩塌地及土石流潛勢區域土石堆積處不安定層（滑動層）和安定層（基岩層）之地質組成及土石構造資料；最後提出施工實務討論與建議事項，希望有助於強化土石流及崩塌地之防治工作。

關鍵字

崩塌地 ； 土石流 ； 鋼管排樁工法 ； 啟動臨界點 ； 起始潰散點

並列摘要

In this paper, the author firstly proposes a feasible way to curb the happening of debris flow and to control landslides by using the steel pipe-wall method. And meanwhile three practical applications are also provided. Secondly the author simply states how depth of surface runoff, depth of unstable layer, and critical hydraulic gradient to relatively trigger the debris flow. Afterward, three calculation examples (two analyzed by RIDO) are presented to show the bending and deformation of the steel-pipe wall. And using large-scale steel pipe boring method in accordance with the traditional geological prospecting to completely search the soil conditions of the stable and unstable layers on the sliding areas and potential debris flow torrents is also suggested. Finally, some suggestions and conclusions are presented. Hopefully, the works for controlling debris flow and landslide area can be effectively improved.

並列關鍵字

landslide area ； debris flow,steel pipe-wall method ； triggering critical point ； initial collapsing point