Experimental Study on Cyclic Simple Shear Test of Coastal Tidal Soft Soil
Abstract
:1. Research Status and Significance
2. Test Introduction
2.1. Test Equipment
2.2. Test Soil Samples and Preparation
2.3. Test Scheme
3. Analysis of Test Results
3.1. Stress–Strain Hysteresis Curve
3.2. Cyclic Cumulative Strain
3.3. Softening Index
4. Conclusions
- As the water content and stress cycle ratio increase, the stress–strain hysteresis loop widens, the strain differential grows, the curve transitions from dense to sparse, the symmetry of the hysteresis curve is lost in the later stages of shearing, and soil damage intensifies.
- This study discusses the impact of different water content conditions and stress cycle ratios on the shear strain and soil failure behavior. The results indicate that the strain increases with cycle number, while higher water contents and stress cycle ratios lead to reduced shear strain and accelerated soil failure. Moreover, soil’s strength deteriorates more rapidly above its optimal water content. A predictive formula for the number of failure cycles, considering varying cyclic stress ratios and water content conditions, was developed based on our test results.
- This study also explores the effects of water content and cyclic stress ratios on soil softening behavior. The findings reveal a gradual decrease in the softening index with an increasing cycle number, while higher water contents and cyclic stress ratios accelerate the soil softening process. At high cyclic stress ratios, more severe damage evolution may occur within the soil, leading to a rapid decline in its cyclic shear strength. Conversely, under optimal water content conditions, the soil may exhibit strong resistance to deformation due to the relative stability of the particle arrangement and structure, resulting in a slow softening rate during initial shear stages.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Displacement (mm) | Measurement Accuracy (um) | Loading Range (kN) | Sample Size (mm) |
---|---|---|---|
±25 (Axial) ±15 (Shear) | 0.3 | Axial = 5 Shear = 2 | 50 × 20 |
Moisture Content ω/% | Specific Gravity ds | Void Ratio e | Liquid Limit wl/% | Plastic Limit wp/% | Maximum Dry Density ρ/(g/cm3) | Optimal Moisture Content % |
---|---|---|---|---|---|---|
76.10 | 2.69 | 1.65 | 68 | 35 | 1.68 | 15.6 |
No. | Axial Stress σ/(kPa) | Stress Cycle Ratio CSR | Moisture Content ω/(%) |
---|---|---|---|
T-1 | 50 | 0.10 | 12.6 |
T-2 | 50 | 0.12 | 15.6 |
T-3 | 50 | 0.14 | 18.6 |
T-4 | 50 | 0.10 | 12.6 |
T-5 | 50 | 0.12 | 15.6 |
T-6 | 50 | 0.14 | 18.6 |
T-7 | 50 | 0.10 | 12.6 |
T-8 | 50 | 0.12 | 15.6 |
T-9 | 50 | 0.14 | 18.6 |
Moisture Content | A (104) | B (104) | R2 |
---|---|---|---|
12.6% | 0.3627 | −2.46 | 0.99 |
15.6% | 0.2829 | −1.91 | 0.99 |
17.6% | 0.2695 | −1.905 | 0.92 |
Stress Cycle Ratio | A (104) | B (102) | R2 |
---|---|---|---|
0.10 | 0.3233 | −1.64 | 0.99 |
0.12 | 0.2524 | −1.273 | 0.99 |
0.14 | 0.2390 | −1.27 | 0.92 |
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Yu, X.; Sun, H.; Liu, J.; Zhao, H.; Han, Y. Experimental Study on Cyclic Simple Shear Test of Coastal Tidal Soft Soil. J. Mar. Sci. Eng. 2024, 12, 1066. https://doi.org/10.3390/jmse12071066
Yu X, Sun H, Liu J, Zhao H, Han Y. Experimental Study on Cyclic Simple Shear Test of Coastal Tidal Soft Soil. Journal of Marine Science and Engineering. 2024; 12(7):1066. https://doi.org/10.3390/jmse12071066
Chicago/Turabian StyleYu, Xiuxia, Honglei Sun, Junwei Liu, Hongxuan Zhao, and Yu Han. 2024. "Experimental Study on Cyclic Simple Shear Test of Coastal Tidal Soft Soil" Journal of Marine Science and Engineering 12, no. 7: 1066. https://doi.org/10.3390/jmse12071066