Study on Test and Detection Method of Mechanical Properties of Heavy Metal Contaminated Soil

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.