Tunnel construction safety early warning method based on detection optical fiber monitoring technology

Abstract

The invention relates to a tunnel construction safety pre-warning method based on a detection optical fiber monitoring technology. Safety accidents easily occur in a space without linings in the tunneling process, and occurrence of the disasters is difficult to predict by a conventional means. The method includes the steps that a detection optical fiber is laid on the wall of a construction tunnel, broadband optical signals sent out by a broadband light source are transmitted to the detection optical fiber through an isolator and a 3dB coupler, a set of reflected lights with different wavelengths are generated through wavelength choice of the detection optical fiber, the reflected lights pass the 3dB coupler again and are received by a wavelength demodulator, wavelength changes, namely, stress changes are monitored after the wavelengths are identified, and disaster pre-warning information is obtained and sent to a dedicated or public network to be released to engineers. According to the method, high-precision and non-interference measurement can be achieved, service life is long, signal transmission distance is long, and the method is suitable for safety monitoring of long and large tunnels, measurement results are not influenced by factors of external disturbance, transmission loss, equipment aging and the like, and information capacity is large.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering safety detection, and in particular relates to a tunnel construction safety early warning method based on detection optical fiber monitoring technology. Background technique [0002] Due to the bottleneck breakthrough of technology and capital, a large number of long tunnels have been selected in my country's railway, highway and other construction projects in recent years to shorten the length of the line and improve the transportation capacity of the line. Therefore, tunnel engineering projects are increasing day by day. In recent years, in many areas with complex geological conditions, the number of tunnels has also increased. The safety problem in tunnel construction has always been a major issue related to human life and national property. Over the years, builders have taken a large number of effective measures in terms of management, survey and design, and construction technolog...

AI Technical Summary

Problems solved by technology

In other words, when the construction workers dig forward to a certain position, in the unlined space and time period, the probability of disasters is very high, and it is difficult to predict and predict the occurrence of such disasters by conventional means

At present, there are many disaster prevention safety monitoring technologies at home and abroad, but there is no safety detection method for unlined tunnels

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