Optical-fiber-based road engineering deformation monitoring equipment

Abstract

The invention discloses optical-fiber-based road engineering deformation monitoring equipment. The equipment mainly comprises a road foundation and a distributed optical fiber sensing system based onbrillouin scattering, wherein the distributed optical fiber sensing system based on brillouin scattering mainly comprises a BOTDR host and a conduction optical fiber; the slope of the road foundationis paved with a pre-embedded steel net. When the pre-embedded steel net has deformation, transverse bearing pull cords are pulled through locating nylon pull cords to generate local deformation, and deformation of the transverse bearing pull cords is monitored through the BOTDR host and the conduction optical fiber. At the moment, the tensile strength of the top end of the whole pre-embedded steelnet can be monitored by a far-end host, so that deformation or pull conditions is effectively detected, traditional optical fiber embedment is not needed overall, and the overall construction difficulty is lower.

Description

technical field [0001] The invention relates to the field of roadbed detection, in particular to an optical fiber-based road engineering deformation monitoring device. Background technique [0002] The base deformation of the subgrade mostly occurs in the fill embankment section, and its main manifestations are slippage, extrusion and collapse. The general embankment and high-fill embankment require sufficient bearing capacity for the subgrade base, which not only bears the dynamic load generated by the vehicle in operation, but also bears a large filling pressure, so the deformation properties and deformation amount of the base soil The size of the soil is mainly determined by the mechanical properties of the base soil, the inclination of the base surface, the nature and occurrence of the soft layer or weak structural surface, etc. [0003] In addition, hydrogeological conditions are also factors that promote the instability of the basement, which often causes huge plastic...

AI Technical Summary

Problems solved by technology

[0004] For the existing roadbed structure, the deformation of the roadbed needs to be inspected regularly. The whole project is not only a large amount of work, but also the detection efficiency is low, especially the inspection of the pre-embedded steel mesh is even more difficult. It is difficult to detect the local deformation by traditional visual inspection.

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