新型亲水性聚氨酯对砒砂岩边坡抗降雨侵蚀的影响

Effect of a Novel Hydrophilic Polyurethane on Increasing Pisha Sandstone Resistance to Rainfall Erosion

通过人工模拟降雨试验,研究新型亲水性聚氨酯材料(W-OH)对不同坡度和降雨强度条件下砒砂岩边坡抗降雨侵蚀的影响。结果表明:(1)坡度和降雨强度两个因素均对砒砂岩边坡受降雨侵蚀影响明显,随着坡度和降雨强度的增加,侵蚀产沙量不断增加,其中降雨强度的影响较坡度更为显著;(2)W-OH处理以后,坡面侵蚀产沙主要由雨滴击溅造成,在所选用的坡度范围内,坡度对坡面侵蚀的影响基本可以忽略;(3)W-OH对砒砂岩边坡抗降雨侵蚀方面减蚀效果非常明显,不同条件下减沙比均超过了98%;(4)W-OH处理以后,在砒砂岩表面形成了一层稳定的保护层,不仅起到了隔离水与砒砂岩的效果,同时又增加了坡面的光滑度使得径流可以快速疏导。

In the indoor simulated rainfall conditions, the effect on increasing resistance to rainfall erosion of Pisha sandstone by a novel hydrophilic polyurethane was studied from the aspects of different rainfall intensity and slope gradient. The results showed that： （1）Both slope and rainfall intensity had a significant effect on Pisha sandstone erosion. With the increasing of slope and rainfall intensity, the sediment yield increased continuously, while the effect of rainfall intensity on erosion was more obvious than that of slope. （2）After the W--OH treatment, the sediment yield was major caused by raindrops splash. The effect of slope could be almost negligible in the experimental conditions. （3）The W-OH had a significant effect on sediment reduction of Pisha sandstone and the value were all more than 98% under any conditions. （4）After spraying W-OH, a steady and solidification layer was formed on the Pisha sandstone surface, which could play a role in isolation of water and Pisha sandstone and speed up the flow grooming by improving slope smoothness.