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Mechanical Behavior Monitoring and Load Inversion Analysis of Large-Diameter Underwater Shield Tunnel during
Si-Yuan Ma1, Xiao-Wei Ye1, Zhi-Xiong Liu1
1Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China.
Sensors (Basel, Switzerland)
|February 24, 2024
Summary
Monitoring underwater shield tunnel construction reveals significant load variations. An IoT system and Bayesian-genetic algorithm accurately estimate water and earth pressure, crucial for structural integrity.
Area of Science:
- Geotechnical Engineering
- Civil Engineering
- Tunneling Technology
Background:
- Underwater shield tunneling faces complex external loads and mechanical responses.
- Understanding segment ring behavior during shield assembly/removal is critical.
Purpose of the Study:
- Analyze load variations and internal forces (axial, bending) on tunnel segments.
- Develop a model to estimate water and earth pressure during underwater tunneling.
- Validate an inversion analysis method for pressure estimation.
Main Methods:
- Established an on-site monitoring system using the Internet of Things (IoT).
- Developed a Bayesian-genetic algorithm for water and earth pressure estimation.
- Analyzed segment ring forces during shield tail assembly and removal.
Main Results:
- Peak external loads in fluctuation sections were twice those in stable sections.
- During shield tail removal, axial forces peaked 8x and bending moments 5x higher than stable sections.
- Inversion analysis of internal forces yielded water and earth pressure estimates twice as accurate as the full coverage pressure method.
Conclusions:
- IoT monitoring and Bayesian-genetic algorithms effectively capture underwater tunnel loads.
- Inversion analysis provides a highly accurate method for determining earth and water pressure.
- Findings offer valuable insights for similar large-diameter underwater shield tunneling projects.
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