黄河源区弯曲河流河岸带抗剪特性

Shearing Resistance of Meandering Rive Riparian Zone in Yellow River Source Region

[目的]为了定量化分析黄河源区弯曲河流河岸带根-土复合体的抗剪强度。[方法]在黄河源区河南县兰木措曲对2个河湾河岸边采取原位制样、室内试验分析的方式,测定根-土复合体抗剪强度。[结果]草甸型河岸带根-土复合体平均黏聚力可达18k Pa,其中河湾凹岸根-土复合体黏聚力比凸岸黏聚力平均约高10%,河湾两岸根-土复合体抗剪强度随着含水量的增大而减小。[结论]该研究为深入分析滨河植被对河岸的抗剪增强作用、减少河岸崩塌频率提供理论依据。

[ Objective ] The research aimed to quantitative｜y analyze the shear strength of soil-root composites in meandering river bank of Yellow River Source Region. [ Method ] The shear strengths of soil-root composites were measured by in situ sample preparation and direct shear tests at two river bends riparian zone in Lanmucuoqu, which is located in Henan county, Yellow River Source Region. [ Result] The average cohesion of soil-root composites reached 18 kPa,and concave bank cohesion was higher than convex band cohesion by 10%. The shear strength of fiver bends decreased with the water content increasing. [ Conclusion] The study can provide theoretical foundation for deep analysis of the riparian vegetation function on the enhancement of shear strength and the decrease of bank failure frequency.