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为改善吹填土的理化性质,实现吹填土在城市生态建设方面的充分利用,通过室内土柱淋洗试验,研究在不同施用量下脱硫石膏对吹填土各种离子动态变化的影响。结果表明:脱硫石膏可以显著改善滨海吹填土的理化性质,脱硫石膏施用量分别为0.7%,1.4%,2.1%,3种处理下土柱的饱和导水率分别是6.21,7.41,9.51mm/h;淋洗后土壤电导率、Na+和Cl-浓度、钠吸附比(SAR)和碱化度(ESP)等指标较淋洗前均有90%以上的降幅程度;且在前20h的淋洗过程中,各种化学指标的下降效果最为明显,而在将近150h的剩余时间内虽有下降,但下降速率很缓慢。
In order to improve the physical and chemical properties of dredger fill and realize the full utilization of dredger fill in urban ecological construction, the influence of gypsum on the dynamic changes of various ions in dredger fill was studied by indoor soil column leaching test. The results show that the desulfurization gypsum can significantly improve the physical and chemical properties of the coastal dredger fill. The desulfurized gypsum application rates are 0.7%, 1.4% and 2.1% respectively. The saturated hydraulic conductivity of soil columns under the three treatments are 6.21, 7.41 and 9.51mm / h. The soil conductivity, Na + and Cl- concentration, sodium adsorption ratio (SAR) and alkalization degree (ESP) were all decreased by more than 90% after leaching. In the process of washing, the descending effect of various chemical indicators is the most obvious, while it decreases in the remaining time of nearly 150 hours, but the rate of decline is very slow.