Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33324
標題: 樁結構物防治土石流功效之試驗
Experiment on Controlling Debris Flowe with Pile Structures
作者: 徐宏銘
HSU, HUNG MING
關鍵字: Debris Flow;土石流;Pile Structure;樁
出版社: 水土保持學系
摘要: 
本研究利用模型試驗,配合不同土砂材料、流量及坡度進行室內渠槽試驗
,探討在改變 樁結構物之樁數及排數下,對於土石流發生及流動狀態下
之影響。經分析結果如下:
1.樁結構物之主要作用為增加土體之抗滑動阻力,而增加樁密度Dr可提高
土體之總抗滑 動阻力,同時降低單樁之平均受力。
2.利用無因次分析推導出堆積土體滲流破壞之時間
t=0.013(Dt)^0.046*(tanψ)^5.47*(sinθ)^-0.59*(sinθi)^0.068*(hp)
^0.077* (Lp)^0.923*(k)^-1
n=96,r=0.99** 其中
k:土砂滲透係數; θ:堆積土體坡度;
Dt:總樁密度; hp:水位面與堆積土體表面距離;
ψ:土體內摩擦角; Lp:樁在土體中之長度;
θi:滲流線坡度;
3.對於土石流之流動段而言,樁結構物之相對開口寬度(b/dmax)對防砂效
果有明顯之 影響,同時複排樁及樁排距較寬之系列其防砂效果較佳。
4.由於結構物型態不同,樁結構物之防砂效果不如一般開口式防砂壩。

The purpose of this paper was going to know the influence on
occurrence and flowing of debris flow with changing
compose of piles. The model experiments were conducted in
a flume channel with different soil materials、water
discharges and the steepness of channel bed. And the results
were concluded as follows.
1. Increasing resistance force on sediment was the main function
of the pile structures. Increasing pile density Dr could
reduce the laterally loaded force on each pile.
2.Using the dimensional analysis could derive an equation for
estimating the time of sediment breakdown by seepage,
that was t=0.013(Dt)^0.046*(
tanψ)^5.47*(sinθ)^-0.59*(sinθi)^0.068*(hp)^0.077*
n=96,r=0.99 (Lp)^0.923*(k)^-1
where
k:Darcy coefficient permeability; θ:slope of sediment;
Dt:total pile density; Lp:lenth of pile in
sediment; ψ:angle of internal friction;
θi:slope of seepage line; hp:distance between
ground water level and sediment surface;
3.The interval of piles had much influence on controlling debris
flow in the flow section. Piles constructed with several rows
had more effects for controlling debris flow.
4.Pile structures had less effect than the opening types of
check dam for controlling debris flow.
URI: http://hdl.handle.net/11455/33324
Appears in Collections:水土保持學系

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