重金属Pb^(2+)污染土的渗透性能研究

Study on hydraulic permeability of heavy metal Pb^(2+) contaminated soil

通过对不同渗透压差下的Pb^(2+)污染土进行室内柔性壁渗透试验,研究不同Pb^(2+)污染浓度、养护龄期及渗透时间对重塑黄土渗透性能的影响。结果表明:当Pb^(2+)与土体反应时间较短时,污染浓度对渗透系数的影响较小,试样龄期为3d时,随着Pb^(2+)污染浓度的增加,渗透系数在低、中、高渗透压下变化规律不同,渗透压差对渗透系数的测定影响较大;在相同铅污染含量下,随着养护龄期加长,铅污染土的渗透系数先减小、后增大。

By studying the hydraulic permeability in flexible wall permeameter of Pb^2＋ contaminated soil in different permeation pressures, discussed the relationships between pollution content, curing age,penetration time and hydraulic permeability of remolded loess. Results showed that when Pb^2＋ has short reaction time with soil , the effect of pollution content is not obvious. When the curing age is 3 , with the increase of Pb^2＋ , hydraulic permeability changes differently at low, medium and high pressures , and permeation pressure has great impact on testing hydraulic permeability： As curing age longer, the trend of hydraulic permeability increases at first and decreases thereafter.