三维土工网垫植草护坡性能试验

Experimental study of properties of slope protection through grass jetting on 3D geomat

通过边坡模型正交试验,在不同降雨强度下分析了网垫类型、草籽密度、土质和坡度等4个因素对三维网垫植草护坡性能的影响。结果表明,坡面侵蚀模量在模拟小雨时受影响因素显著性高低顺序为草籽密度、坡度、土质和网垫类型,而暴雨时网垫类型对侵蚀模量的影响明显增加,且采用三维网垫植草护坡时坡面侵蚀模量相比无护坡时减少了5倍左右,三维网垫植草护坡抗冲刷效果明显;由网垫、根系和土组成的坡面浅层加筋土复合体的等效黏聚力随深度的增加总体上呈逐渐减少的趋势,且二者之间呈现三次曲线变化关系;坡面采用厚度大的网垫和植物根系密度较大时都会使坡面浅层土的渗透系数增加。

Based on ecological slope protection models by orthogonal tests, comparative experimental study of properties of slope protection through grass jetting on 3D geomat considered types of 3D geomat, density of grass seeds, types of soil and slope gradient are conducted under different rain intensity. The results show that the sequence of sensibilities for erosion modulus is density of grass seeds, slope gradient, types of soil and 3D geomat under the condition of simulating light rain, geomat can play a remarkable role to erosion modulus under the condition of simulating rainstorm, the erosion modulus for slope protection by grass jetting 3D geomat reduces 5 times than non-protection natural slope. Equivalent cohesion of soil-grass-geomat compound decreases with the increase of depth, and curvilinear regression between equivalent cohesion and depth is cubic polynomial expression. Permeability coefficient of surface soil tends to increase with thicker geomat and bigger density of grassroots.