红柳根系对塔里木河岸坡土体起动规律影响研究

为了研究红柳根系对塔里木河岸坡土体起动的影响规律,对不同植被根系体积密度及不同的根系分布方式下的根-土复合体进行起动特性试验,并分析植被根系影响下起动切应力变化规律,得到了根系影响下河岸土体起动切应力与植被根系体积密度及土体干密度的定量关系式。试验结果表明:不同根系放置形式土体抗水流冲刷的由大到小分别为相交放置,竖直放置,倾斜放置。当有红柳根系覆盖河岸土体时,土体的起动切应力得到了明显提高。

Study on influence of red willow root system on starting law of soil on bank of Tarim River

In order to study the influence of red willow root system on the starting law of soil on the bank of the Tarim River, a starting characteristics test was carried out on the root-soil composites with different vegetation root system volume density and different root distribution patterns. The law of starting shear stress under the influence of vegetation root system was analyzed. The quantitative relationship between the starting shear stress of the riparian soil and the root density of the vegetation, the dry density of the soil under the influence of root system was obtained. The results showed that the soil erosion resistances of different root placement ranks as intersected placed＞vertical placed＞tilt. When the red willow roots cover the river bank soil, the starting shear stress of the soil can be obviously improved.