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Shear Strength and Stress-Strain Normalized Characterization of Alkali-Contaminated Red Clay.
Guiyuan Xiao1, Dajin Zhang2, Guangli Xu2
1Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, 541004, China. xiaoguiyuangit@163.com.
Bulletin of Environmental Contamination and Toxicology
|June 26, 2025
Summary
Alkali contamination weakens red clay
Area of Science:
- Geotechnical Engineering
- Environmental Geochemistry
Background:
- Alkali contamination poses a global soil issue.
- Red clay is a common soil in southern China used in infrastructure.
- Understanding alkali's impact on red clay's mechanical properties is crucial.
Purpose of the Study:
- To investigate the effects of alkali contamination on red clay's shear strength.
- To analyze the stress-strain behavior of alkali-contaminated red clay.
- To develop a predictive model for the stress-strain relationship.
Main Methods:
- Consolidated undrained triaxial shear tests were performed.
- Red clay samples were contaminated with varying pH levels (7, 9, 10, 11).
- Stress-strain data were normalized to establish a predictive equation.
Main Results:
- Alkali contamination reduced red clay's shear strength.
- Increased pH levels led to a consistent decrease in shear strength.
- The cementation of free oxides and interparticle structure were disrupted.
Conclusions:
- Alkali contamination significantly degrades red clay's shear strength.
- A validated prediction equation for stress-strain behavior was developed.
- The study enhances understanding of alkali-affected red clay in geotechnical applications.
Keywords:
Alkali contaminationConsolidated undrained triaxial testRed clayShear strengthStress–strain normalizedMore Related Videos
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