Tunnel ground surface settlement monitoring device based on distributed optical fiber sensing and monitoring method

Abstract

The invention relates to a tunnel ground surface settlement monitoring device based on distributed optical fiber sensing and a monitoring method. The tunnel ground surface settlement monitoring device based on distributed optical fiber sensing comprises distributed optical fibers, a datum point arranged at the position 3-5 times of the tunnel hole diameter away from the horizontal distance of the tunnel axis and multiple monitoring points which are symmetrically distributed at equal intervals by taking the tunnel axis as an axis; the datum point and the monitoring points are each provided with an installation base, the distributed optical fibers are arranged in the installation bases of the datum point and the monitoring points and communicate the datum point with the monitoring points. The tunnel ground surface settlement monitoring device based on distributed optical fiber sensing and the monitoring method are simple in step, high in operability and lower in cost.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering site monitoring, and relates to a tunnel surface settlement monitoring device and monitoring method based on distributed optical fiber sensing. Background technique [0002] With the continuous improvement of the national highway network construction and the continuous advancement of the central and western development strategy, the expressway is gradually moving towards the mountainous area, and there are more and more shallow buried, biased, and large-section tunnels, and the tunnels pass through weak surrounding rocks. There are more and more unfavorable geological conditions such as landslides, karsts, etc., and the stability of surrounding rocks will face great challenges during the construction process. At the same time, there are more and more urban subway tunnels in our country in recent years. They inevitably face complex situations such as passing through densely populated are...

AI Technical Summary

Problems solved by technology

The existing surface subsidence monitoring methods mainly include leveling method and triangular elevation measurement method, but these two methods have requirements for visibility and are easily limited by terrain conditions, especially in mountainous areas with large surface fluctuations. It is extremely difficult, and the measurement accuracy is difficult to guarantee; and in the case of dense vegetation on the surface of the tunnel, conventional surface settlement monitoring methods are almost impossible to work

[0005] 2) The monitoring process is time-consuming and laborious

Conventional monitoring methods require manual rulers, readings, and records. When the number of monitoring points is large, the monitoring process requires a lot of manpower; especially in harsh weather conditions, the monitoring work is extremely difficult

[0006] 3) Unable to realize automatic monitoring and early warning

Existing monitoring methods cannot complete continuous and uninterrupted surface subsidence monitoring, and cannot provide dynamic and real-time feedback monitoring data. Therefore, monitoring and early warning of tunnel surface subsidence cannot be realized, which is not conducive to the whole process analysis of tunnel surface subsidence, and it is easy to miss dangerous situations

In view of this, the existing surface subsidence monitoring technology can no longer adapt to the development of tunnel engineering construction in terms of monitoring effects and economic benefits.

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