A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles
Abstract
:1. Introduction
2. Project Overview
3. Methodology
3.1. Test of Transmitted Wave in the Pile
3.2. Test of Dynamic Penetration
4. Results
4.1. Test Analysis of Transmitted Wave in the Pile
4.2. Test Analysis of Dynamic Penetration
5. Discussion
6. Conclusions
- (1)
- The influencing range of base post-grouting was firstly evaluated by the transmitted wave method in the pile. The depth of the pile base reinforcement was 2 m for No. 1 pile, and 1 m for No. 2 pile, which was consistent with the grouting amount.
- (2)
- The strength of the soil before and after grouting under the same pile base was measured by the dynamic penetration method. The elastic modulus of the base soil after post-grouting was about twice that of the base soil before grouting.
- (3)
- The properties of the base soil increased with the grouting amount. The bearing capacity of the base soil layer increased from 35.5% to 41.7%, as the grouting amount increased from 250 kg to 500 kg.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Layer Number | Formation Name | H/m | γ/(kN·m−3) | ES/(MPa) | c/(kPa) | φ/(°) | fa/(kPa) |
---|---|---|---|---|---|---|---|
1 | Fill | 2.1 | |||||
2 | Silt | 19.4 | 16.5 | 2.16 | 8.9 | 2.8 | 55 |
3 | Clay | 23.8 | 17.6 | 3.06 | 20.3 | 5.4 | 80 |
4 | Silty clay | 26.1 | 18.1 | 4.09 | 31.3 | 7.6 | 120 |
5 | Gravel | 2.9 | 200 | ||||
6 | Silty clay | 10.9 | 18.9 | 4.45 | 41.1 | 9.4 | 180 |
7 | Gravel | 18.1 | 200 |
Hammer Quality (kg) | Drop Distance (cm) | Probe Diameter (mm) | Probe Cone Angle (°) | Probe Rod Diameter (mm) | Target Penetration Depth (cm) |
---|---|---|---|---|---|
10 | 76 | 74 | 60 | 42 | 10 |
Hammering Times | 3 | 4 | 5 | 6 | 8 | 10 | 12 |
---|---|---|---|---|---|---|---|
Characteristic value of foundation bearing capacity (kPa) | 140 | 170 | 200 | 240 | 320 | 400 | 480 |
Characteristic Value of Foundation Bearing Capacity (kPa) | Before Grouting | After Grouting |
---|---|---|
No. 1 pile | 211.2 | 299.2 |
No. 2 pile | 168.8 | 228.8 |
No. 3 pile | 211.2 | 211.2 |
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Hu, H.; Jin, Q.; Yang, F.; Zhou, J.; Ma, J.; Gong, X.; Guo, J. A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles. Appl. Sci. 2022, 12, 10996. https://doi.org/10.3390/app122110996
Hu H, Jin Q, Yang F, Zhou J, Ma J, Gong X, Guo J. A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles. Applied Sciences. 2022; 12(21):10996. https://doi.org/10.3390/app122110996
Chicago/Turabian StyleHu, Haibo, Qiqin Jin, Feng Yang, Jiajin Zhou, Junjie Ma, Xiaonan Gong, and Jin Guo. 2022. "A Novel Method for Testing the Effect of Base Post-Grouting of Super-Long Piles" Applied Sciences 12, no. 21: 10996. https://doi.org/10.3390/app122110996