ABSTRACT

Heavy metal pollution in soil has an increasingly serious impact on the ecological environment, quality of agricultural and livestock products, and healthy living. Researches on detection methods and remediation technologies for heavy metal contaminated soil have received widespread attention. In this paper, the conventional mechanical properties and viscoelastic properties of heavy metal (cadmium, chromium, lead, zinc) contaminated soils were experimentally studied in combination with heavy metal pollution for agricultural soil. Compressive stress and strain, compressive strength, compressive modulus, and other indices of compressive mechanical properties, shear strength, shear modulus, and other indices of shear mechanical properties, bending strength, bending stiffness, elastic modulus, and other indices of bending mechanical properties in four metal contaminated soil samples and control group at different moisture contents were tested. Because viscoelastic plasticity and time effect soil, the correlation between creep parameters such as delay elastic modulus, viscosity coefficient, and heavy metal content were studied. The difference between the mechanical properties of the heavy metal contaminated soil sample and the control soil sample was analyzed, and a significant difference index was selected, and a discriminative model for heavy metal contaminated soil was proposed through multiple logistic regression analysis. The discriminative model was used to verify the heavy metal contaminated soils configured in the laboratory and contaminated soil retrieved from chromium slag site, and a detection method for expressing soil heavy metal pollution by using mechanical property parameters was explored to provide method reference for the detection of heavy metal contaminated soil.

摘要

土壤中的重金属污染对生态环境，农产品和畜牧产品的质量以及健康生活的影响日益严重。对重金属污染土壤的检测方法和修复技术的研究受到了广泛的关注。本文结合重金属污染对农业土壤进行了实验研究，研究了重金属（镉，铬，铅，锌）污染土壤的常规力学性能和粘弹性。压缩应力和应变，抗压强度，压缩模量和其他压缩机械性能指标，剪切强度，剪切模量以及其他剪切机械性能指标，弯曲强度，弯曲刚度，弹性模量，测试了四种金属污染土壤样品和对照组在不同水分含量下的弯曲力学性能指标。由于粘弹性和时间效应会影响土壤，因此研究了蠕变参数如延迟弹性模量，粘度系数和重金属含量之间的相关性。分析了重金属污染土壤样品与对照土壤样品的力学性能之间的差异，并选择了显着差异指数，并通过多元逻辑回归分析提出了重金属污染土壤的判别模型。判别模型用于验证实验室中配置的重金属污染土壤和从铬渣站点回收的污染土壤，