基于有机材料-三维植生毯技术的 黄土边坡抗降雨侵蚀试验研究

Experimental Study on Resistance of Organic Material-Three-dimensional Planting Blanket on Loess Slope to Rainfall Erosion

基于自主研发的黄土加固有机材料,并结合生态要求,提出有机材料-三维植生毯黄土护坡技术。通过人工模拟降雨试验,分析有机材料固化黄土护坡和有机材料-三维植生毯护坡对黄土侵蚀特征和坡面产流产沙的影响,对比评价其抗侵蚀能力。结果表明:有机材料能阻止黄土坡面细沟的产生和发育,削弱坡面径流侵蚀土体的能力,提高其稳定性;有机材料-植生毯坡面几乎无坡面侵蚀发育,坡体稳定性较好。在相同时间下,有机材料坡面径流量高于裸露坡面,而有机材料-植生毯坡面的累计径流量低于裸露坡面,二者的产沙总量都远小于裸露坡面。有机材料-三维植生毯坡面防护分为2个过程,前期主要依靠有机材料固化护坡,后期主要依靠三维植生毯护坡,两者结合更有利于提高黄土抗降雨侵蚀能力。

Based on the self-developed loess-reinforced organic materials of Chengdu university of technology,and combined with ecological considerations,this paper proposes the organic material-three-dimensional planting blanket slope protection technology,analyzes the slope protection effects of organic materials and organic materials-three-dimensional planting blanket on loess erosion characteristics and slope runoff&sediment yield through artificial simulated rainfall test,as well as compares and evaluates the erosion resistance.The results show that:Organic materials can prevent the formation and development of rills on loess slopes,weaken the ability of slope runoff to erode the soil,and improve the slope stability;There is almost no erosion on three-dimensional planting blanket slope,so the slope stability is good;Under the same time,the runoff of the organic material slope is higher than that of the bare slope,while the cumulative runoff of the organic material-planting blanket slope is lower than that of the bare slope,and the total sediment yield of both is much smaller than that of the bare slope;The organic material-three-dimensional planting blanket slope protection is divided into two processes:in the first stage,the slope is protected and reinforced by organic materials,and in the later stage,the slope is mainly protected by three-dimensional planting blanket.Therefore,the combination of the two is more conducive to improving the resistance of loess to rainfall erosion.