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为改善滨海吹填土的理化性质,加快提升吹填土在城市生态建设中的土地价值,开展脱硫石膏不同接触时间处理对滨海吹填土理化性质影响的试验研究。结果表明:滨海吹填土导水能力极弱,在整个淋洗过程中始终没有淋出液排出,2,5,10,50d脱硫石膏接触处理后土壤饱和导水率分别达到6.21,7.20,7.20,7.65mm/h,显著提升了滨海吹填土的导水能力。2,5,10,50d石膏接触处理分别经220,116,116,196h淋洗后,淋出液盐分均达到0.5dS/m以下,淋洗用水量分别为5.16,3.85,4.21,4.95L。淋洗后,土壤含盐量由处理前6.98dS/m下降到0.28～0.36dS/m,土壤中Cl-、Na+浓度分别由处理前的9.03,4.85g/kg下降到0.05～0.34g/kg和0.01～0.04g/kg,土壤钠吸附比(SAR)以及土壤碱化度(ESP)分别由处理前的27.89和28.15下降到0.18～0.8和0.02～0.28,已经为非碱化土,土壤的各理化指标均得到明显改善。综合各种因素与指标,脱硫石膏与吹填土5d接触处理效果最佳。
In order to improve the physical and chemical properties of coastal dredger fill, speed up the value of dredger fill in urban ecological construction, and carry out experimental study on the influence of different contact time of gypsum treatment on physical and chemical properties of dredger fill. The results show that the water conductivity of coastal dredger fill is extremely weak, and no leachate is discharged during the entire leaching process. The saturation hydraulic conductivity of the soil after the gypsum treated for 2, 5, 10 and 50 days is 6.21, 7.20 and 7.20 respectively , 7.65mm / h, which significantly improved the water carrying capacity of Binhai dredger fill. After 2, 5, 10, 50d gypsum contact treatment, respectively, the leaching solution salt reached 0.5dS / m or less after rinsing by 220, 116, 116 and 196h respectively. The rinsing water volumes were 5.16, 3.85, 4.21 and 4.95L respectively. After leaching, the soil salinity decreased from 6.98dS / m before treatment to 0.28 ~ 0.36dS / m, and the concentrations of Cl- and Na + in soil decreased from 9.03 and 4.85g / kg before treatment to 0.05-0.34g / kg And 0.01-0.04 g / kg respectively, the soil sodium adsorption ratio (SAR) and soil alkalization degree (ESP) decreased from 27.89 and 28.15 before treatment to 0.18-0.8 and 0.02-0.28, respectively. All physical and chemical indicators have been significantly improved. Combining various factors and indexes, desulfurized gypsum and dredged earth 5d contact treatment best.