新型水溶性聚氨酯对紫色土坡面产流产沙的影响

摘要

为探索新型水溶性聚氨酯防治紫色土坡面水土流失的效果,采用室内人工模拟降雨试验,分析了不同雨强条件下5％浓度的新型水溶性聚氨酯(W-OH)对紫色土坡面人渗、产流和侵蚀过程的影响.结果表明:紫色土坡面施加W-OH能显著提高土壤抗蚀性,从而减小坡面侵蚀产沙量;在42,72,112 mm/h 3种雨强试验条件下,施加W-OH组的坡面与对照组坡面相比,尽管坡面径流增大了12.40％ ～ 203.41％,但产沙量减小了89.40％～ 97.43％,沙输移率降低了86.67％ ～ 97.45％,且当雨强较大时(72,112 mm/h),施加W-OH组的土壤可蚀性降低率为96.80％～97.41％.研究结果为紫色土坡面防蚀提供了一定的理论依据及应用指导.%In the purpose of investigating the effect of treating soil erosion of purple soil slope by new water-soluble polyurethane (W-OH),we analyzed the impact of W-OH of 5％ concentration on the processes of infiltration,runoff and erosion of purple soil slope under different rainfall intensities through indoor artificial rainfall experiment.We found that W-OH could remarkably enhance the erosion resistance of soil and reduce sediment yield on slope surface.Under test conditions of three different rainfall intensity (42,72,and 112mm/h),the sediment yield on W-OH treated group declined by 89.40％-97.43％,and sediment transport rate by 86.67％-97.45％ despite that runoff increased by 0.12-2.03 times compared with the control group.Under heavy rainfall(72 and 112 mm/h),the erodibility of W-OH treated soil reduced by 96.80％-97.41％.The conclusions offer theoretical basis and application guidance for the protection of purple soil slope.