Ground surface settlement quasi-distributed monitoring device and method based on optical fiber sensing technology

Abstract

The invention discloses a ground surface settlement quasi-distributed monitoring device and method based on an optical fiber sensing technology. The device comprises quasi-distributed settlement monitoring station points, a distributed optical fiber fixed-point sensing circuit, a PPP-BOTDA optical fiber data acquisition instrument and a data processing system. A fixed-point anchoring support is arranged on each quasi-distributed settlement monitoring station point; the distributed optical fiber fixed-point sensing circuit comprises distributed optical fiber inlet parts and distributed opticalfiber return parts, and the two distributed optical fibers are fixed on the fixed-point anchoring supports; the distributed optical fiber inlet parts are arranged in a zigzag mode, and the distributedoptical fiber of the distributed optical fiber inlet part between every two adjacent fixed-point anchoring supports are in a pre-stretching state; and the distributed optical fiber of the distributedoptical fiber return part between every two adjacent fixed-point anchoring supports are in a relaxed state. Under the condition that the spatial resolution is met, the monitoring range is enlarged, the monitoring precision is guaranteed, and the defects of low efficiency, low spatial resolution and low precision of the conventional monitoring technology are overcome.

Description

technical field [0001] The invention relates to geotechnical engineering monitoring technology, in particular to a quasi-distributed monitoring device and method for surface subsidence based on optical fiber sensing technology. Background technique [0002] Due to foundation pit and underground engineering construction, energy extraction, groundwater extraction, and foundation consolidation settlement will lead to surface settlement, which will affect the safety, stability and healthy operation of surface construction facilities and traffic pipelines. The monitoring of surface settlement is an important link in the construction safety monitoring of shallow buried underground engineering and foundation pit engineering, and it also provides an important basis for evaluating the safety and stability of surface buildings and the healthy operation of traffic pipelines. Accurate and real-time monitoring of surface subsidence can provide necessary conditions for ensuring the safe c...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of conventional monitoring methods and previous distributed optical fiber monitoring methods, the present invention provides a quasi-distributed monitoring device and method for surface subsidence based on optical fiber sensing technology. Under the condition of satisfying the spatial resolution, the monitoring range is expanded, It also ensures the monitoring accuracy and makes up for the shortcomings of previous monitoring technologies such as low efficiency, low spatial resolution, and low precision.

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