Tunnel construction safety pre-warning method based on detection optical fiber monitoring technology
A technology for tunnel construction and safety warning, which is applied in the direction of earth drilling, mining equipment, mining equipment, etc. It can solve the problems that there are no safety detection methods for unlined tunnels, and achieve the effect of light weight, high sensitivity and easy maintenance
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[0024] The present invention will be described in detail below in conjunction with specific embodiments.
[0025] The tunnel construction safety early warning method involved in the present invention is realized based on the detection optical fiber monitoring technology, and has the advantages of stability, sensitivity and high reliability. The detection fiber is formed by using ultraviolet exposure technology to cause periodic changes in the refractive index in the fiber core. The periodic structure of the refractive index distribution in the fiber leads to the reflection spectrum of a specific wavelength of light in the fiber. When the optical fiber is subjected to changes in external temperature, stress or strain, the peak wavelength of the reflected light drifts. The temperature, stress and strain can be sensed by measuring the wavelength drift, so as to sense the changes in the surface of the unlined tunnel. The physical change of the stress on the tunnel is converted into a...
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