Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall
Abstract
:1. Introduction
2. Construction Method and Process
2.1. Device Characteristics
2.2. Construction Procedure
- (1)
- Preparation before construction
- (2)
- Wall axis measurement and setting out
- (3)
- Excavation of slurry guide groove
- (4)
- Hole location setting out
- (5)
- Layout of backstage pulping system
- (6)
- High-pressure fluid pipeline connection
- (7)
- Slurry preparation
- (8)
- Drill hole
- (9)
- Slurry transportation, gas transportation, static injection and lift injection
- (10)
- Lift the nozzle to the design elevation, stop jetting, and move it to the next hole.
- (11)
- Consolidate into a wall
3. Quality Inspection Method of Cut-Off Wall
3.1. Water Permeability Test
3.2. High-Density Electrical Method
4. Quality Inspection in Jinggangshan Navigation Hydropower Project
4.1. Project Overview
4.2. Wall Body Inspection Test
4.3. Detection of Wall Permeability
5. Quality Inspection in Xingan Navigation Hydropower Project
5.1. Project Overview
5.2. Detection of Wall Permeability
6. Conclusions
- (1)
- According to the construction characteristics of the embankment cut-off wall in hydraulic engineering, this study presents the transformation of the conventional high-pressure jet grouting machine, puts forward high-pressure jet grouting with a large-borehole-diameter, ipsilateral multi-nozzle, and puts forward the corresponding construction process based on this. The proposed construction method can adapt to the formation conditions in which it is difficult to implement conventional high-pressure jet grouting, and obtain good construction efficiency.
- (2)
- The construction method of high-pressure jet grouting with a large drill diameter and ipsilateral multi-nozzle is adopted to carry out field construction tests and for application in the cut-off wall of the reservoir area dyke protection works of the Jinggangshan navigation hydropower project and Xingan navigation hydropower project. Through penetration tests of core samples from a test wall, the side of core samples is smooth and the bonding is good, and the average permeability coefficient is less than the design value of impermeability. The permeability of the test wall section is detected by a high-density electrical meter, and there is no obvious leakage area in the wall. It indicates that a favorable wall quality can be obtained by using more efficient large-diameter and ipsilateral multi-nozzle jet grouting in the construction of high-pressure jet cut-off wall.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | Number | Sampling Location | Hydraulic Pressure/MPa | Condition after Water Pressure | Average Permeability Coefficient/cm/s | Impermeability Design Value/cm/s |
---|---|---|---|---|---|---|
Cement soil core 1 | 1-1 | Inspection point of high-pressure jet grouting cut-off wall | 0.08 | 6.12 × 10−7 | 6.92 × 10−7 | ≤i × 10−6 |
1-2 | 2.15 × 10−7 | |||||
1-3 | 6.92 × 10−7 | |||||
1-4 | 9.95 × 10−7 | |||||
1-5 | 8.10 × 10−7 | |||||
1-6 | 8.28 × 10−7 | |||||
Cement soil core 2 | 2-1 | 3.56 × 10−7 | 7.35 × 10−7 | ≤i × 10−6 | ||
2-2 | 8.77 × 10−7 | |||||
2-3 | 7.35 × 10−7 | |||||
2-4 | 8.30 × 10−7 | |||||
2-5 | 6.52 × 10−7 | |||||
2-6 | 9.60 × 10−7 |
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Liu, D.; Xie, W.; Gao, J.; Hu, S.; Chen, M.; Li, Y.; Li, L. Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall. Sustainability 2022, 14, 10383. https://doi.org/10.3390/su141610383
Liu D, Xie W, Gao J, Hu S, Chen M, Li Y, Li L. Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall. Sustainability. 2022; 14(16):10383. https://doi.org/10.3390/su141610383
Chicago/Turabian StyleLiu, Da, Weijiang Xie, Jianglin Gao, Songtao Hu, Ming Chen, Yan Li, and Linhua Li. 2022. "Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall" Sustainability 14, no. 16: 10383. https://doi.org/10.3390/su141610383
APA StyleLiu, D., Xie, W., Gao, J., Hu, S., Chen, M., Li, Y., & Li, L. (2022). Study on the Construction Method and Effects of Ipsilateral, Multi-Nozzle, High-Pressure Jet Grouting Cut-Off Wall. Sustainability, 14(16), 10383. https://doi.org/10.3390/su141610383