Research on Static and Dynamic Loading Performance of Geosynthetic Reinforced and Pile-Supported Embankment
Abstract
:1. Introduction
2. Experimental Tests
2.1. Specimen Design
2.2. Material Properties
2.3. Test Setup and Loading Devices
3. Experimental Results and Discussion
3.1. Stress Distribution of Pile
3.2. Pile–Soil Stress Ratio
3.3. Tension Distribution of Geogrid
3.4. Dynamic Stress of Soil
3.5. Tension of Geogrid under Dynamic Load
4. Numerical Simulation
4.1. Numerical Model
4.2. Settlement Analysis and Comparisons
4.3. Parametric Study Results and Discussions
4.3.1. Effect of Embankment Height
4.3.2. Effects of Pile Spacing
4.3.3. Dynamic Stress Attenuation Coefficient
5. Conclusions
- (1)
- In this paper, the pile–soil stress ratio under dynamic loading is reduced by about 2.3 compared to that under static loading, and the stress in the soil around piles increases and the soil arch effect weakens under dynamic loading. The soil arch effect in the GRPS embankment is obvious under static load, and the space arch effect is stronger than the plane arch effect. Also, the stronger the soil arch effect under static loading, the more weakened it is under dynamic loading. The stronger the action of the static load–soil arch effect, the more weakened it is under dynamic loading. The dynamic change trend of soil between piles with vibration times is similar to that of the “N” type, but the change trend of soil on top of piles is opposite.
- (2)
- The GRPS embankment under dynamic loading is still affected by the tensile membrane effect. The strengthening effect of geogrid under dynamic load is not as obvious as under static load. Before forming a stable soil arch, the tension of the geogrid changes rapidly, and when the stable soil arch is formed, the change in geogrid tension tends to be stable.
- (3)
- The embankment height influences the soil arch, but the influence range of the soil arch is limited. The increase in pile spacing increases the height of the soil arch and extends the area influenced by the soil arch effect. However, the strength of the soil arch is weakened. On the contrary, when the pile spacing is small, the height of the soil arch will be reduced, but the soil arch structure formed is more stable. When the pile spacing is small, the bearing capacity of the pile can be more effectively utilized, and the transfer of soil stress between piles to the top of the pile is more obvious, which can better utilize the reinforcing effect of piles to improve the bearing capacity of the GRPS embankment.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Type | Physical Quantity | Similarity Coefficient |
---|---|---|
Similarity ratio | Length | |
Elasticity modulus | ||
Density | ||
Unit weight | ||
Poisson ratio | ||
Strain | ||
Stress | ||
Displacement |
Name | Unit Weight (kN/m3) | Internal Friction Angle (°) | Cohesive Forces (kPa) | Moisture Content (%) | Poisson Ratio | Elasticity Modulus (MPa) |
---|---|---|---|---|---|---|
Loess | 19.4 | 28.24 | 37.8 | 17.6 | 0.32 | 7.99 |
Cushion | 25.0 | 40 | 38.5 | 16.3 | 0.14 | 65 |
Embankment | 22.0 | 40 | 36.2 | 15.5 | 0.17 | 38 |
Pile | 22 | - | - | - | 0.33 | 1 × 104 |
Parameters | Unit | Values |
---|---|---|
Mesh size | mm | 30 |
Longitudinal tensile strength | kN/m | 30 |
Poisson ratio | - | 0.39 |
Elasticity modulus | GPa | 2.32 |
Transverse tensile strength | kN/m | 30 |
Longitudinal tensile strength at 2% strain | kN/m | 10.5 |
Transverse tensile strength at 2% strain | kN/m | 10.5 |
Longitudinal yield elongation | % | 13 |
Transverse yield elongation | % | 16 |
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Deng, Y.; Zhao, H.; Li, L.; Yao, Z.; Li, L. Research on Static and Dynamic Loading Performance of Geosynthetic Reinforced and Pile-Supported Embankment. Appl. Sci. 2023, 13, 13152. https://doi.org/10.3390/app132413152
Deng Y, Zhao H, Li L, Yao Z, Li L. Research on Static and Dynamic Loading Performance of Geosynthetic Reinforced and Pile-Supported Embankment. Applied Sciences. 2023; 13(24):13152. https://doi.org/10.3390/app132413152
Chicago/Turabian StyleDeng, Yousheng, Huiling Zhao, Lingtao Li, Zhigang Yao, and Long Li. 2023. "Research on Static and Dynamic Loading Performance of Geosynthetic Reinforced and Pile-Supported Embankment" Applied Sciences 13, no. 24: 13152. https://doi.org/10.3390/app132413152