惰性污染因子Cl~迁移特性的离心模拟试验研究

Experimental study on migration characteristics of inert pollution factor Cl^- in the centrifugal model

污染因子在土壤中迁移机理在室内多采用土柱试验开展研究,但对于低渗透性土壤(<10-5cm/s),由于土壤渗透过程极其缓慢,其试验过程漫长甚至无法完成试验。离心模拟试验技术不但能够模拟重力场,而且也可以模拟污染物的迁移过程。本文利用LXJ-4-450 g-t离心机,通过专门研制的离心模拟试验装置,对惰性污染因子Cl-在低渗透性饱和黏土中的长期迁移规律进行了离心模拟试验研究,并对其在低渗透性饱和黏土中的迁移规律进行了模拟分析。研究结果表明,对低渗透性黏土采用离心模拟试验开展污染物迁移规律的研究可极大提高试验效率和可靠度。

Study on the migration mechanism of pollution factor in the soil is normally carried out with soil column test in laboratory,but for the low permeability soil （permeation coefficient less than 10^-5cm/s）, the permeability process in the soil is very slow, and the test process is very long or even unable to complete. The centrifuge model test can simulate not only the gravity field, but also the migration process of pollutants. In this paper, by using LXJ-4-450 g-t centrifuge together with the specially developed device for permeability test,the long-term migration pattern of inert pollution factor Cl^- in low permeability saturated clay is studied in the centrifugal model,and the migration pattern of pollution factor Cl^- in low permeability saturated clay are analyzed. The results show that simulation test study on pollutant migration in low permeability clay in the centrifugal model is feasible,and greatly improves the test efficiency and reliability.