A health monitoring system for inverted arch of salt rock tunnel based on laser level deformation monitor and wFBG. (November 2021)

• Record Type: Journal Article
• Authors: LI, Jinyi; ZHOU, Feicong; ZHOU, Ping; LIN, Jiayong; JIANG, Yifan; WANG, Zhijie
• Is Part Of: Measurement. Volume 184(2021)
• Publication Date: 2021-11
• Subjects: Salt rock tunnel -- Health monitoring of inverted arch -- Laser level deformation monitor -- Weak fiber Bragg grating -- Damage mechanism; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2021.109909
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: A new multi-layer intelligent monitoring system for inverted arch is proposed. The early warning and feedback system for inverted arch are established. The deformation characteristics and damage mechanism of the inverted arch are proved. Provide new ideas for tunnel monitoring in salt rock stratum. Abstract: In salt rock stratum, tunnels are prone to damages such as corrosion cavity in base or inverted arch bulging and cracking. However, the conventional monitoring system cannot accurately characterize the deformation mechanism of the inverted arch in this stratum. Therefore, this paper innovatively proposes a multi-layer deformation intelligent monitoring system for inverted arch of salt rock tunnel, which combines laser level deformation monitor and weak fiber Bragg grating, to monitor comprehensively the filling and internal deformation of tunnel inverted arch. At the same time, an early warning and feedback system is established through wireless transmission to ensure construction safety. By exploring the deformation characteristics and damage mechanism of tunnel base and inverted arch in strata with different salt contents, the relationship between the surrounding rock properties and structural stability is established, verified by the geological radar results. The monitoring system and feedback system have been successfully applied in the salt rock tunnel of China-Laos Railway.