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采用改进的电阻率测试设备,对3种室内人工配制的重金属(Zn,Pb,Cd)污染黏性土进行正交试验研究.探讨了4种因素(污染物掺量N、孔隙湿密度md、体积含水量Pr和污染种类S)对重金属污染黏性土电阻率的影响.结果表明:重金属污染黏性土电阻率随孔隙湿密度和体积含水量的增大呈指数函数减小,随污染物掺量的增大而减小,并且相同离子化合价的重金属离子对土体电阻率的影响规律基本一致.方差法和极差法分析表明,4种影响因素对重金属污染黏性土电阻率的影响程度不同,其影响程度大小依次为:N,m_d,P_r,S.此外,为将Archie电阻率预测模型的应用范围进行拓展,建立了适用于重金属污染黏性土的电阻率预测模型.该电阻率预测模型可以用于特定区域重金属污染场地的定量评价.
In this paper, three kinds of indoor labilely prepared heavy metal (Zn, Pb, Cd) contaminated cohesive soil were studied by using the improved resistivity test equipment.The effects of four factors (pollutant content N, pore wet density md, Volumetric water content Pr and pollution type S) on the resistivity of heavy metal-contaminated clay.The results show that the resistivity of heavy metal-contaminated clay decreases exponentially with the increase of pore water density and volumetric water content, The content of heavy metal ions decreases with the increase of the content of heavy metal ions, and the influence laws of the heavy metal ions with the same ionic valence on the resistivity of the soil are basically the same.The analysis of variance and range method shows that the influence of four factors on the resistivity of the heavy metal-contaminated clay In order to extend the application range of Archie’s resistivity prediction model, a resistivity prediction model suitable for heavy metal-contaminated clay is established. The resistance Rate prediction model can be used for quantitative evaluation of heavy metal contaminated sites in specific areas.