Experimental Study on the Strength Characteristics of Organic-Matter-Contaminated Red Soil in Yulin
Abstract
1. Introduction
2. Test Overview
2.1. Test Materials
2.2. Test Scheme
2.2.1. Triaxial Compression Test
2.2.2. Unconfined Compressive Strength Test
2.2.3. Scanning Electron Microscopy Test
3. Analysis of Test Results
3.1. Effect of Organic Matter Content on Stress–Strain Relationship Curve of Red Soil
3.2. Effect of Organic Matter on Shear Strength Index of Red Soil
3.3. Effects of Modifiers on the Unconfined Compressive Strength of Organic-Matter-Contaminated Red Soil
3.4. Effects of Modifiers on the Microstructure of Organic-Matter-Contaminated Red Soil
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specific Gravity | Maximum Dry Density/g·cm3 | Optimum Moisture Content/% | Liquid Limit/% | Plastic Limit/% | Plasticity Index | Cohesion/kPa | Internal Friction Angle/° |
---|---|---|---|---|---|---|---|
2.65 | 18.94 | 1.78 | 49.86 | 25.22 | 24.64 | 60.98 | 17.42 |
Main Chemical Components | SiO2 | Al2O3 | Fe2O3 | K2O | TiO2 | P2O5 | NaO | MgO | SO3 | CaO |
---|---|---|---|---|---|---|---|---|---|---|
Mass Percentage/% | 60.09 | 24.55 | 6.90 | 4.80 | 1.00 | 0.07 | 0.11 | 2.03 | 0.09 | 0.10 |
Main Mineral Components | Quartz | Hematite | Potassium Feldspar | Plagioclase | Kaolinite | Illite | Montmorillonite | Chlorite |
---|---|---|---|---|---|---|---|---|
Mass Percentage/% | 34.40 | 3.30 | 0.90 | 2.00 | 1.19 | 29.70 | 26.14 | 1.78 |
Name | Material Parameters |
---|---|
Sodium Humate | Particle size of 200 mesh, black, powder, water-insoluble matter < 5% |
Lignin | Particle size of <0.5 mm, white, thin strips, humidity < 3% |
Fly Ash | Class F secondary fly ash, SO3 ≤ 4.5% |
Xanthan Gum | Ingredients: corn, light beige, powder |
Name of Modified Material | Content/% | Number of Parallel Tests |
---|---|---|
Lignin | 0, 2, 4, 6, 8 | 3 |
Fly Ash | 0, 5, 10, 15, 20 | 3 |
Xanthan Gum | 0, 0.5, 1, 1.5, 2 | 3 |
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Long, J.; Yan, H.; Zhou, H.; Xie, Z.; Yang, B. Experimental Study on the Strength Characteristics of Organic-Matter-Contaminated Red Soil in Yulin. Buildings 2025, 15, 853. https://doi.org/10.3390/buildings15060853
Long J, Yan H, Zhou H, Xie Z, Yang B. Experimental Study on the Strength Characteristics of Organic-Matter-Contaminated Red Soil in Yulin. Buildings. 2025; 15(6):853. https://doi.org/10.3390/buildings15060853
Chicago/Turabian StyleLong, Jinbin, Hangyu Yan, Haofeng Zhou, Zhigao Xie, and Bai Yang. 2025. "Experimental Study on the Strength Characteristics of Organic-Matter-Contaminated Red Soil in Yulin" Buildings 15, no. 6: 853. https://doi.org/10.3390/buildings15060853
APA StyleLong, J., Yan, H., Zhou, H., Xie, Z., & Yang, B. (2025). Experimental Study on the Strength Characteristics of Organic-Matter-Contaminated Red Soil in Yulin. Buildings, 15(6), 853. https://doi.org/10.3390/buildings15060853