Earth-rockfill embankment seepage saturation surface fiber monitoring apparatus and method

Abstract

The invention discloses an earth-rockfill embankment seepage saturation surface fiber monitoring apparatus and method. The apparatus comprises a DTS, a fiber sensing unit and a fiber heating unit, the fiber sensing unit is connected with the DTS, the fiber heating unit is connected with the fiber sensing unit, the fiber sensing unit comprises armored fibers and a fiber layout frame, the fiber layout frame is a rectangular frame, width d of the rectangular frame is axial length of an earth-rockfill embankment body to be monitored, length l of the rectangular frame is section width of the earth-rockfill embankment body, and n points are marked to both long sides of the rectangular frame; by acquiring and analyzing time and strength information of Raman back-reflecting light generated by laser pulse after being injected from an injection end of a linear multimode temperature-sensing fiber and being propagated in the fiber, corresponding position and temperature information is acquired, and a position of seepage saturation surface is acquired according to a temperature jump point. The apparatus and method have the advantages that operating is simple, the apparatus and method are suitable for long-term use and are high in durability and reliability, seepage surface positioning is accurate, and monitoring precision is high.

Description

technical field [0001] The invention relates to an optical fiber monitoring device and method for the seepage infiltration surface of an earth-rock dam, in particular to an optical fiber monitoring device and method for the seepage infiltration surface of an earth-rock dam using distributed optical fibers and a distribution frame to form an optical fiber sensing unit, which belongs to the seepage and infiltration of an earth-rock dam Surface monitoring technology field. Background technique [0002] Earth-rock dams play the role of retaining water, and their safety status is related to the safety of people's lives and properties downstream and the development of the national economy. The seepage working state of earth-rock dams is very important to the safe operation of dams. The height and shape of the seepage seepage surface directly reflect the seepage safety of the dam. The dam burst and the consequences were dire. Therefore, monitoring the seepage and soaking surface ...

AI Technical Summary

Problems solved by technology

Due to the relationship between the seepage pressure measuring points and the seepage equipotential lines, it is often difficult to monitor the actual seepage seepage surface (line) of the embankment by using a piezometer or a piezometric tube, and it is also impossible to perform distributed observations and realize unsaturated seepage monitoring. Can only have a rough grasp of the overall seepage situation of the dam, which is not conducive to the safe and normal operation of the dam

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