OFDR (Optical Frequency Domain Reflectometer)-based deep horizontal displacement and underground water level integrated monitoring and early warning system and method

Abstract

The invention discloses an OFDR (Optical Frequency Domain Reflectometer)-based deep horizontal displacement and underground water level integrated monitoring and early warning system and method. The system comprises a distributed optical fiber strain sensor, a self-heating optical fiber temperature sensor, an inclinometer pipe, a hollow steel pipe, an optical fiber data acquisition instrument, a solar cell panel, an optical fiber junction box, a transformer, a narrow linewidth tunable laser, a coupler, a cloud platform, a monitoring result processing and display system and an early warning system, wherein the distributed optical fiber strain sensor is positioned in a groove of the inclinometer pipe, the hollow steel pipe is fixed to the inner side of the inclinometer pipe, and the opticalfiber temperature sensor is wound and fixed to the surface of the hollow steel pipe; the optical fiber data acquisition instrument transmits data to the monitoring result processing and display systemthrough the cloud platform, and the system compares a peak value with a set early warning value and judges whether early warning is carried out or not; and the monitoring result processing and display system is connected with the early warning system, and an indicator lamp flickers during early warning. The system is high in precision and can achieve early warning in advance so as to prevent structural instability damage caused by too large deep horizontal displacement or too large underground water level changes.

Description

technical field [0001] The invention relates to a deep horizontal displacement and groundwater level monitoring and early warning system, in particular to an OFDR-based deep horizontal displacement and groundwater level integrated monitoring and early warning system and method. Background technique [0002] At present, inclinometers are mainly used in civil engineering to monitor deep horizontal displacement. The traditional methods and instruments used for monitoring horizontal displacement of deep soil have the following shortcomings: [0003] (1) The measurement results are discontinuous and there are measurement blind spots; manual segmented measurement is required, the measurement process takes a long time, and real-time and automatic monitoring cannot be realized. [0004] (2) The movable inclinometer is easily damaged and has poor durability; when the soil deformation is large, the inclinometer cannot pass after the inclinometer pipe is bent beyond a certain angle, re...

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Problems solved by technology

[0003] (1) The measurement results are discontinuous and there are measurement blind spots; manual segmented measurement is required, the measurement process takes a long time, and real-time and automatic monitoring cannot be realized

[0004] (2) The movable inclinometer is easily damaged and has poor durability; when the soil deformation is large, the inclinometer cannot pass after the inclinometer pipe is bent beyond a certain angle, resulting in the failure of the measuring point

[0005] (3) If debris falls into the inclinometer pipe or a large amount of silt seeps into the pipe, the inclinometer cannot pass through, which will also cause the failure of the measuring point

[0006] (4) The traditional method used for groundwater level monitoring needs to bury special water level monitoring pipes, which cannot realize real-time and automatic monitoring, and requires manual measurement readings, which greatly wastes manpower and financial resources

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