Reconstruction and extension tunnel surrounding rock-support structure state monitoring and construction method based on flexible piezoelectric strain sensing

By adopting a flexible piezoelectric strain sensing system during the tunnel reconstruction and expansion process, the stress strain and temperature changes of the surrounding rock-supported structure are monitored in real time, and the problems of limited monitoring accuracy and coverage in the existing technology are solved, and high-precision and full-coverage tunnel structure monitoring are achieved.

CN119984384AActive Publication Date: 2025-05-13SHANDONG UNIV +1
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Patent Information

Application Number
CN202510020689.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-05-13
Estimated Expiration
2045-01-07

AI Technical Summary

Technical Problem

The prior art is difficult to monitor the properties of surrounding rock-support structures in real time and reliably during tunnel reconstruction and expansion. Especially in the case of construction disturbances and complex surrounding rock deformation, traditional sensors are susceptible to interference, and the monitoring accuracy and coverage range are limited.

Method used

The monitoring system based on flexible piezoelectric strain sensing is adopted, including flexible piezoelectric sensing module, existing tunnel monitoring module and renovated and expanded tunnel monitoring module. Through distributed flexible piezoelectric strain sensing and temperature compensation sensing, the stress strain and temperature changes of surrounding rock-support structures are monitored in real time.

Benefits of technology

It has achieved high-precision, full coverage and real-time monitoring of the surrounding rock-support structure of the tunnel through renovation and expansion, enhanced the safety and stability of the construction process, and overcome the shortcomings of traditional sensors in complex environments.

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Abstract

The invention discloses a reconstruction and extension tunnel surrounding rock-support structure state monitoring and construction method based on flexible piezoelectric strain sensing, and relates to the technical field of intelligent sensing and reconstruction and extension tunnels. The system comprises a flexible piezoelectric sensing module, and the flexible piezoelectric sensing module comprises a flexible piezoelectric strain sensor and a temperature compensation sensor, and is used for monitoring the stress strain and temperature compensation of a surrounding rock supporting structure; the existing tunnel monitoring module takes flexible piezoelectric sensing as a core and is used for distributed strain monitoring on the surface of existing tunnel lining concrete; the reconstruction and extension tunnel monitoring module comprises anchor rod axial force monitoring, steel arch frame internal force monitoring, middle partition wall internal force monitoring and secondary lining stress monitoring, and the reconstruction and extension tunnel monitoring module takes a flexible piezoelectric sensing module as a core. According to the invention, online, dynamic and real-time monitoring of the structural state of the reorganization and extension tunnel surrounding rock and the support can be realized, and powerful guarantee measures are provided for operation and maintenance safety of the reorganization and extension tunnel.
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Citation Information

Patent Citations

  • Monitoring method and system for tunnel drilling and blasting method in-situ reconstruction and extension project

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