In this work, geotechnical properties of heavy-metal contaminated soil consist of basic properties, strength, leaching, electrical resistivity and microstructural characteristics were investigated. The results showed that the clay content, specific surface area and cation exchange capacity of the soil decreased as heavy-metal concentrations increased. The decrease in basic properties was more significant in Zn-contaminated soil than that in Pb-contaminated soil. The unconfined compressive strength (UCS) decreased as heavy-metal concentrations increased. The effect of Zn²⁺ on UCS was confirmed to be greater than that of Pb²⁺. The leached heavy-metal concentration increased with higher initial heavy-metal concentrations. A greater leaching capacity was observed in Zn-contaminated soil compared to Pb-contaminated soil. With increasing pore fluid resistivity, UCS values gradually increased and leached ion concentrations dramatically decreased before becoming stable. Zn-contaminated soil was found to have a lower strength and higher leached-ion concentration than Pb-contaminated soil. A set of equations was proposed to successfully predict the engineering properties of contaminated soil using pore fluid resistivity. Microstructural analysis presented that, as heavy-metal concentrations increased, clay particles aggregated, the flocculation structure and the inter-aggregate pores became enlarged. Zn-contaminated soil had larger aggregate and inter-aggregate pores, compared to Pb-contaminated soil. In general, significant effects of heavy metal ions on geotechnical properties of the contaminated soil have been revealed and analyzed in the present work, which could be predicted using the pore fluid resistivity in a more effective way.

在这项工作中，对重金属污染土壤的岩土特性进行了研究，包括基本特性，强度，浸出，电阻率和微观结构特征。结果表明，土壤中的粘土含量，比表面积和阳离子交换能力随重金属浓度的增加而降低。锌污染土壤的基本特性下降比铅污染土壤的下降更为显着。随着重金属浓度的增加，无侧限抗压强度（UCS）降低。证实Zn ²⁺对UCS的影响大于Pb ²⁺。浸出的重金属浓度随着初始重金属浓度的升高而增加。与被铅污染的土壤相比，在锌污染的土壤中观察到了更大的浸出能力。随着孔隙流体电阻率的增加，UCS值逐渐增加，而浸出的离子浓度在变得稳定之前急剧下降。发现被锌污染的土壤比被铅污染的土壤具有更低的强度和更高的浸出离子浓度。提出了一组方程，以利用孔隙流体电阻率成功地预测受污染土壤的工程特性。微观结构分析表明，随着重金属浓度的增加，粘土颗粒聚集，絮凝结构和聚集间的孔变大。锌污染的土壤具有较大的聚集体和聚集体间的孔，与被铅污染的土壤相比。通常，在本工作中已经揭示和分析了重金属离子对受污染土壤的岩土特性的重大影响，可以通过更有效的孔隙流体电阻率来预测重金属离子的影响。