Tunnel structure monitoring system and tunnel structure monitoring method based on distributed long-gauge fiber bragg grating

A fiber grating and tunnel structure technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as short time, and achieve the effects of disaster prevention, simple layout, and low monitoring cost

Inactive Publication Date: 2015-02-25
SOUTHEAST UNIV +2
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Problems solved by technology

However, it has been used in civil engineering for a relatively short time, the optimal design of optical fiber monitoring network, the fast and non-destructive laying of distributed sensing optical fibers, the judgment of the health status of tunnel structures during operation, and the real-time collection and analysis of detection data still exist. Some technical problems that need to be resolved

Method used

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  • Tunnel structure monitoring system and tunnel structure monitoring method based on distributed long-gauge fiber bragg grating
  • Tunnel structure monitoring system and tunnel structure monitoring method based on distributed long-gauge fiber bragg grating

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Embodiment

[0037] The distributed optical fiber grating sensing tunnel health monitoring system of this embodiment includes a sensing optical fiber arranged in the tunnel and a processing system for collecting and sensing optical fiber data.

[0038] Distributed long gauge fiber grating sensors or other distributed fiber grating sensors can be used in this system. Distributed sensors can be divided into two types: horizontal layout and vertical layout.

[0039] Taking the shield segment during the construction period as an example to illustrate, the schematic diagram of the sensor layout is as follows figure 1 shown.

[0040] The first sensors arranged along the entire length of the tunnel include a top sensor 1-1 at the vault of the tunnel and a bottom sensor 1-2 at the bottom of the tunnel for monitoring the settlement of the tunnel. The second sensor 2 arranged circumferentially along the inner surface of the tunnel lining structure is used to monitor the diameter change of the tunn...

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Abstract

The invention discloses a tunnel structure monitoring system and a tunnel structure monitoring method based on a distributed long-gauge fiber bragg grating. The system comprises distributed long-gauge fiber bragg grating sensors which are comprehensively distributed in a monitored range along the axial direction and the cross section of a tunnel; and longitudinal sedimentation of the tunnel and change conditions of various ring joints of the shield tunnel are monitored. The method comprises the following steps of arranging the distributed long-gauge fiber bragg grating sensors; and acquiring, transmitting and processing data. By the tunnel structure monitoring system and the tunnel structure monitoring method based on the distributed long-gauge fiber bragg grating, full-life monitoring on a tunnel structure in a construction period and a running period can be carried out, and longitudinal sedimentation, convergence deformation, joint deformation, duct piece internal force, strain and the like of the tunnel structure are dynamically monitored in real time.

Description

technical field [0001] The invention relates to a tunnel monitoring system, in particular to a method for monitoring the health of a tunnel lining structure by using a distributed long gauge optical fiber grating sensor, and belongs to the technical field of civil engineering monitoring. Background technique [0002] Compared with other projects, tunnel engineering has the characteristics of concealment, complexity, and uncertainty. The tunnel structure and its force deformation process are more complicated, which increases the difficulty and risk in the construction process. At the same time, due to the influence of geological conditions, external environment, train vibration and many other factors, the health of the tunnel structure is gradually deteriorating with the increase of operation time. Therefore, strengthening the daily monitoring measures of the tunnel structure, early detection of various damage characteristics of the tunnel during the daily operation period, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 陶津徐会杰李金涛宋国侠王佳妮
Owner SOUTHEAST UNIV
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