A high-speed rail tunnel shape and position sensing method based on buried optical fiber

Abstract

The invention discloses a shape and position sensing method of a high-speed railway tunnel based on an embedded optical fiber, which comprises the following steps: pre-embed a temperature-sensitive optical cable along the longitudinal direction of the tunnel vault, and pre-embed a vibration sensor in the cement mortar protective layer outside the tunnel vault. Optical cables, pre-embedded fiber grating concrete strain gauges along the tunnel ring, connecting the optical fiber sensing elements to the demodulator and transmitting the sensing data to the server, analyzing the leakage, fire, abnormal intrusion, ring internal force of the tunnel and implementing Call the police. The present invention can sense and identify the occurrence time and location of events such as tunnel leakage, fire, and abnormal intrusion in real time and accurately, and can sense the inner force of the tunnel ring in the whole life cycle, which solves the problem that existing tunnel disease monitoring methods rely on It solves the problems of poor reliability and low data accuracy of the existing tunnel internal force monitoring system.

Description

technical field [0001] The invention belongs to the field of railway tunnel engineering, and in particular relates to a shape-position sensing method of a high-speed railway tunnel based on an embedded optical fiber. Background technique [0002] With the rapid development of my country's high-speed railway, the number of tunnel projects has also increased greatly, and with it comes the question of how to ensure the safety of high-speed railway tunnel operation. Especially in recent years, in order to promote the integrated development of urban agglomerations, high-speed railways and intercity railways, as important components of transportation integration, have been successively approved for construction. According to the relevant codes and standards promulgated by the relevant national departments, after the tunnel structure is completed, it should have good bearing capacity, durability and service life that meets the durability requirements under appropriate design, const...

AI Technical Summary

Problems solved by technology

At present, by strengthening the inspection of tunnel structure safety and disease during the operation period, it is possible to evaluate and predict the development of tunnel structural diseases to a certain extent, but this method has high management and labor costs, and cannot monitor continuously for 24 hours The safety of tunnel operation, the response time to sudden diseases and accidents is slow, which is not conducive to the timely treatment of diseases and accidents

[0004] Existing automatic sensing of tunnel structure safety and disease mainly adopts point-type sensing technologies such as resistive or vibrating wires. During the long-term monitoring process, problems such as sensor aging failure, data drift and distortion will occur.

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