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黑棉土治理:使用压实石灰作为水力屏障材料的入渗能力研究

A. N., I. M., B. B., N. Y.

摘要

许多研究表明了水力屏障在减少沥滤液流动方面的作用,但沥滤液有可能污染地下水。实验室用干重高达5%的石灰处理过的黑棉土壤上进行试验,以评估其在废物收集设施中的适用性,并且对测试样品进行粒度分布分析、稠度极限测试、压实和水力传导率测试。压缩标准采用英国标准光(BSL)。研究表明,随着石灰含量的增加,液限从65.20%下降到56.30%,塑性指数从41.50%下降到28.58%,而塑限从23.70%上升到27.72%。最大干密度(MDD)随着石灰的增加而增加,从1.78到1.88克/厘米3。而最佳含水量(OMC)从19.79%下降到15.39%。用占土重0%、1%、3%和5%的石灰分别处理黑棉田土壤,研究其水力传导度。天然土壤的渗透系数为1.65E-08,当石灰含量为5%时,渗透系数降至3.71 E-09 m/s。因此,很明显,渗透系数随着石灰含量百分比的增加而降低。建议进行体积收缩、自由膨胀和无侧限抗压强度试验。

关键词

石灰;入渗能力;屏障材料;黑棉土

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参考

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