Work

Transformation method of Φ-OTDR optical fiber strain and tunnel liner strain and its application in tunnel safety monitoring

Year: 2026

Type: article

Abstract: A distributed optical fiber stress and strain monitoring system (DSS) is developed based on Φ-OTDR sensing in this study. To apply the system to tunnel monitoring, dynamic and static tests of concrete beams are proposed to calibrate the relationship between Φ-OTDR strain and structural strain. The development trend of Φ-OTDR strain accumulation over time under the influence of the external environment is εfiber, t=(0.023 ± 0.001)·t+(0.1425 ± 1.1795) through static tests. Combined with dynamic tests, the transformation relationship between Φ-OTDR strain and structural strain is εstruc = 1.263·εfiber-0.029·t + 0.708. The accuracy of the transformation method and the feasibility of Φ-OTDR fiber in structural strain monitoring are verified by tunnel field monitoring test. Finally, a tunnel safety warning platform is established based on Φ-OTDR technology. The calculation program and safety threshold library of monitoring indexes are implanted into the platform, making the system automatically judge and alarm the tunnel safety, thus ensuring the tunnel construction safety intelligently.

Source: Scientific Reports

DOI: 10.1038/s41598-026-43749-5

Authors: Kai Cao, Ziliang Xie, Feicong Zhou, Xibao Wang, Jiabin Tang, Zhijie Wang

Institutions: Tongji University, Fuzhou University, Southwest Jiaotong University

Language: English

Topic: Advanced Fiber Optic Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,690