High-speed railway tunnel shape and position sensing method based on buried optical fibers

Abstract

The present invention discloses a high-speed railway tunnel shape and position sensing method based on buried optical fibers. The method comprises the following steps: pre-burying a temperature-sensitive optical cable along a longitudinal direction of a tunnel arch; pre-burying a vibration-sensing optical cable along the inner side of a cement mortar protective layer outside the tunnel arch; pre-burying a fiber grating concrete strain gauge along the circumferential direction of the tunnel arch; connecting a fiber sensing component to a demodulator and transmitting sensing data to a server; and analyzing seepage, fire, abnormal intrusion, and a circumferential inner force in the tunnel, and issuing an alarm. According to the method provided by the present invention, the occurrence time andposition of seepage, fire, abnormal intrusion, and other accidents in the tunnel can be accurately sensed and identified in real time, and the whole life cycle of the circumferential inner force in the tunnel can be sensed, so that the problems that the existing tunnel hazard monitoring method relies on the manpower and has hysteresis are solved, and the problems of poor reliability and low dataaccuracy of the existing tunnel internal force monitoring system are solved.

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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