Research on Displacement Monitoring of Key Points in Caverns Based on Distributed Fiber Optic Sensing Technology

Area of Science:

• Geotechnical Engineering
• Civil Engineering
• Structural Health Monitoring

Background:

• Accurate real-time monitoring of key-point displacements is vital for cavern structure safety.
• Traditional methods lack the precision needed for complex environments.
• Fiber optic sensors offer high sensitivity to optical and spectral changes.

Purpose of the Study:

• To investigate the application of fiber optic sensors for monitoring key-point displacements in cavern structures.
• To establish a reliable model for correlating sensor data with structural displacement.
• To assess the influence of material and structural properties on monitoring accuracy.

Main Methods:

• Theoretical analysis to derive a displacement-strain relationship model.
• Uniaxial compression tests to validate the theoretical model.
• Numerical simulations to explore the impact of material and structural variations.

Main Results:

• A linear relationship model between key-point displacement and circumferential strain was derived and validated.
• Material properties and structural characteristics were found to influence the model's parameters (slope and intercept).
• Fiber optic sensors accurately measured circumferential strain and reflected displacement trends within the elastic range.

Conclusions:

• Fiber optic sensors show significant potential for precise structural health monitoring in civil and geotechnical engineering.
• The developed linear relationship model provides a theoretical basis for applying these sensors to cavern structures.
• This research supports engineering design optimization and disaster prevention efforts through enhanced monitoring capabilities.