不同PVA施用量下滨海吹填土淋洗试验

Leaching of Hydraulic Fill under Different Dosages of PVA in Coastal Region

通过室内土柱淋洗试验,研究了PVA施用量对吹填土透水性、电导率、水溶性盐基离子和pH的影响。结果表明,PVA质量分数为0.1%、0.2%、0.35%时,吹填土淋出液电导率降至1dS/m以下所需历时分别为214、214、171h,未施用PVA所需历时为255h。淋洗220h后,PVA质量分数为0.1%、0.2%、0.35%处理的淋出液总体积分别为2.66、2.46、3.01L,较未施用PVA处理(1.68L)分别增加了58%、47%、79%;淋洗220h后,吹填土全盐量均小于0.75g/kg,pH较处理前有所升高。

The effects of PVA dosages on the variations of water permeability,EC,water soluble base ion and pH of hydraulic fill were studied based on soil column leaching experiments in the laboratory.The results showed that the times,when EC1∶5of leachate decreased below 1dS/m,were 214,214 and 171h with PVA dosages of 0.1%,0.2%and 0.35%respectively while the time was 255 hwithout PVA.After leaching for 220 h,the total volumes of leachate were 2.66,2.46 and 3.01 Lwith PVA dosages of 0.1%,0.2% and 0.35%respectively,and increased by 58%,47% and 79% compared to that（1.68L）without PVA.Soil salt contents in hydraulic fill were all less than 0.75g/kg and pH was higher than that in original soil after leaching for 220 h.