三维植被网加筋草皮坡面土壤侵蚀试验研究

Experimental research on soil erosion of turf slope reinforced by 3D vegetation net

为研究植草型生态护坡的抗坡面侵蚀性能,对比设置三维植被网加筋材料前后草皮护坡的植被防护效果,探讨加筋材料提高草皮抗侵蚀性能的作用机理,在实验室内进行了草皮护坡坡面冲刷模型试验.试验结果表明:当坡面流流速大于2 m/s时,天然草皮的侵蚀模数较之裸露边坡平均减小了90%以上,草皮防护作用随流速的增大而减弱;设置三维土工网垫后,加筋草皮的侵蚀模数较之纯草皮减小了50%以上,防护优势随着流速的增大愈加显著;天然草皮能有效地控制坡面侵蚀,设置三维植被网加筋材料可以大大提高草皮的防护效果,其作用机理表现在边坡土体加筋作用、覆盖防护作用、增强草皮侧向连续性3个方面.

Laboratory model experiments on slope scouring were performed to investigate the erosion-resisting characteristics of ecological slope protection. The effects of turf slope protection before and after reinforcement by 3D vegetation net were compared, and the mechanism of erosion-control by reinforced material was studied. The experimental results show that, when the flow velocity along the slope is over 2m/s, the natural turf protection reduces the erosion modulus of slope by over 90%, and the effect of slope protection weakens with the increase of flow velocity, meanwhile the setting of 3D vegetation net further reduces the erosion modulus by over 50%. Therefore, the natural turf has great effects on slope erosion-control and 3D vegetation net can greatly improve the effect of slope protection. The mechanism of slope protection by 3D vegetation net was described as the following aspects： reinforcement of slope soil, coverage and protection of slope soil, enhancement of side-continuity of turf.