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土体受到重金属离子污染后,会引起土的工程性质的改变,重金属离子的渗出也会给周围环境带来严重的危害。在国外,目前常采用水泥固化技术来处治重金属污染土;而在我国,这方面的研究成果还很少。主要通过系统的室内试验和理论分析,研究了在不同污染物掺量、污染物类型、水泥掺量以及养护龄期条件下固化污染土的强度特性。试验结果表明,金属污染物的存在会导致土体无侧限抗压强度较小幅度的降低,但随着水泥掺入量及养护龄期的增加,土体强度会有显著提高。试验结果还发现,不同的污染物类型及掺入量对固化污染土强度存在不同的影响,NaCl能促进水泥固化土早期强度的提高,而CuCl2和AlCl3则会阻碍水泥与土的固化反应。
Soil contaminated by heavy metal ions will cause changes in the engineering properties of the soil, heavy metal ions exudation will also bring serious harm to the surrounding environment. Abroad, cement curing technology is often used to treat heavy metal contaminated soil. In our country, there are few research results in this area. Mainly through systematic laboratory test and theoretical analysis, the strength characteristics of solidified contaminated soil under different pollutant content, pollutant type, cement content and curing age were studied. The results show that the existence of metal contaminants will lead to a smaller decrease of unconfined compressive strength of soil, but with the increase of cement incorporation and curing age, the strength of soil will be significantly increased. The results also showed that different types and amounts of pollutants have different effects on the strength of solidified contaminated soil. NaCl can promote the early strength of cement-cured soil, while CuCl2 and AlCl3 will hinder the curing reaction of cement and soil.