KLD草毯抗侵蚀特性研究

Study on anti-erosion characteristics of KLD grass carpet

试验研究了一种生态护坡材料——KLD草毯的抗冲特性和抗雨淋侵蚀特性。试验表明,由于KLD草毯具有较大的孔隙率,在水流的冲刷作用下,草毯内的土壤不断被水流侵蚀。植物根系的固土作用能提高草毯的抗冲能力,但是草毯袋内的土壤损失率仍然偏大,KLD草毯不宜用于水下的边坡防护。雨淋侵蚀试验表明,KLD草毯具有很好的渗透性,可有效降低地表径流,其表面的塑料丝网和植被可显著减小降雨的击溅力,生长的植物根系也起到了固土和保土作用;在大暴雨条件下,草毯袋内土壤损失率不超过3%,大暴雨持续1 h后,袋内的土壤损失率几乎不变。

The anti-scour and anti-rain erosion characteristics of a kind of eco-revetment material,i. e. KLD grass carpet,are experimentally studied herein. The experiment shows that the soil inside of the grass carpet is continuously eroded under the scouring effect of water flow due to the larger porosity of the grass carpet. Though the soil-reinforcement effect of the plant roots can enhance the anti-scouring capacity of the grass carpet,the loss rate of the soil in side of the bag of the carpet is slightly larger yet,thus the KLD grass carpet is not suitable for the underwater slope protection. The rain erosion experiment shows that the KLD grass carpet has a better permeability and then can effectively lower the surface runoff,of which not only the plastic mesh and the vegetation on its surface can significantly reduce the force of the rain splash,but the plate roots can also play a role of soil reinforcement and conservation. Under the heavy rainstorm,the loss rate of the soil inside of the bag of the carpet is not over3%,while it is almost unchanged after the continuance of the rainstorm for one hour.