4.6 Article

Triaxial Experimental Study of Zinc Contaminated Red Clay under Different Temperature Conditions

Journal

APPLIED SCIENCES-BASEL
Volume 12, Issue 21, Pages -

Publisher

MDPI
DOI: 10.3390/app122110742

Keywords

temperature; stress-strain curves; modulus of deformation; shear strength; shear strength index

Funding

  1. Guangxi Innovation-Driven Development Special Project Research and Demonstration of Key Technologies for Water Resource Utilization and Synergistic Development of Water Ecological Industry in Typical Karst Wetlands in the Lijiang River Basin [Guike AA20161004-1]
  2. National key research and development program subject R&D and experimental demonstration of key technologies for water resource regulation in Karst wetlands in the Lijiang River Basin [2019YFC0507502]
  3. National Natural Science Foundation of China Project Research on the Collapse Mechanism of Karst Water-soil Coupling in Guilin under Extreme Climate Conditions [41967037]

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Temperature, zinc contamination concentration, and surrounding pressure have significant effects on the mechanical properties of Guilin red clay. The stress-strain curves of the red clay show strain-hardening behavior, with increase in temperature and zinc contamination concentration resulting in increased shear strength. Furthermore, the deformation modulus tends to increase initially with increasing strain but then decreases.
Temperature is one of the important factors affecting the mechanical properties of geotechnical soils, and its role in engineering construction in China cannot be underestimated. In order to study the effects of temperature and zinc contamination concentration on the mechanical properties of Guilin local red clay, a temperature-controlled triaxial shear test was conducted on Guilin red clay under three variables of temperature, zinc contamination concentration and surrounding pressure. The test findings revealed that there are significant differences in the effects of temperature, zinc contamination concentration and surrounding pressure on the mechanical properties of Guilin red clay. The stress-strain curves of the red clay at various temperatures, contamination concentrations and envelope pressures are of the strain-hardening type, and the deformation modulus showed a tendency to increase rapidly with increasing strain, then decrease rapidly, and finally, decrease slowly. With the increase of temperature, the cohesion of Zn-contaminated red clay increases, while the angle of internal friction increases and then decreases, both of which increase the shear strength of red clay. As the concentration of Zn contamination grows, the shear strength of the red clay increases, while the internal friction angle increases and then decreases, and the shear strength of the soil increases and then decreases. The shear strength of the Zn-contaminated red clay improved as the surrounding pressure increased.

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