植生複合材料應用於渠道內面工之研究

A Study of Composite Vegetation Materials Applied on Channel Lining

鄒禕(I Tsou) ； 鍾肇光(Chao-Kuang Chung) ； 邱敬翔(Ching-Hsiang Chiu)

《農業工程學報》 52卷3期 (2006/09) Pp. 89-98

https://doi.org/10.29974/JTAE.200609.0009

摘要

本研究以百喜草與土壤結合成之植生複合材料為研究對象。百喜草為臺灣目前主要推廣之一般邊坡、裸露地及蝕溝控制用草種，為水土保持重要方法之一。研究之目的為建立以此種植生複合材作為一般渠道工程設計施工時所需之各項基木資料。試驗設計以屏東科技火學土壤及高屏溪河川地上壤培養不同植生密度，不同植生土層厚度及不同生長時問之樣本，進行拉拔力試驗及剪力試驗。結果顯示，在相同的植生時問以及相同植生密度下，土壤凝聚力會隨著含水量的增加而降低，下降約87%~42%。相同的植生時間在高含水量35%時，凝聚力隨植生密度增加有顯著增加，約增加3.2~0.7倍。而固定含水量以及植生密度，培植時問愈久凝聚力愈大，同樣在高含水量35%時此現象更為明顯，凝聚力大約增加1.9~0.2倍。此外植生土壤之內摩擦角由含水量15%和41°下降至含水量35%時之26°。另外拉拔力試驗結果顯示，同樣含水量情況下，由植生時問60天增加至90天，學校土壤樣本拉拔力約增加2.3~2.1倍，高屏溪土壤樣本約增加2.5~1.7倍。比較學校土壤樣本之拉拔力約為高屏溪土壤植生樣本之1.7~1.9倍。

關鍵字

百喜草 ； 拉拔力試驗 ； 剪力試驗

並列摘要

This study is consider that Bahia grass and soil as a composite material for channel lining design. Bahia grass is one of the most important plants for soil conservation engineering. The purpose of the research will focus on measuring the basic design parameters of this composite material. Two types of soil, which are National Pingtung University of Science & Technology campus soil and Kaopin-river's riverbed soil, are chosen to develop composite samples with different vegetation density, soil depth and duration of growth. The samples, which are construct by root and soil, are using to process the analysis of pulling resistance and shear force and soil mechanics characteristics. The result shows that with the same duration and density cohesion decrease 870%~ 42% when moisture content increase. With high moisture content at 35% the cohesion increases about 3.2 to 0.7 times when vegetation density increase. Also the results show that at high moisture content cohesion increase about 1.9~0.2 times when growing duration increase. In addition to cohesion, the result shows that the angle of friction decrease from 41° at 15° moisture content to 26° at 35% moisture content. As for pulling resistance that increase about 2.3~2.1 times for campus soil sample and 2.5-l.7 times for riverbed soil, when growing duration increase from 60 to 90 days. Also the pulling resistance is about 1.7~l.9 times compare campus soil to riverbed soil sample.

並列關鍵字

Bahia grass ； Pulling resistance ； Shear force