Direct Measuring Method of Geogrid Force Based on Fiber Bragg Grating Technology

Abstract

The invention discloses a method for directly measuring the force of a geogrid based on fiber grating technology. This method includes two steps: the packaging of the fiber grating semi-tight sleeve structure and the calibration method of the direct measurement of the force parameters of the geogrid; combining casings with different specifications and roughnesses to realize the semi-tight sleeve packaging structure, ensuring the coordination of deformation At the same time, the grating is protected; through a calibration method for measuring the force parameters of the geogrid, the direct measurement of the force parameters is realized through the systematic tensile test of the semi-tight sleeve sensing structure geogrid; the grating area The casing of the section is roughened to achieve interface compatibility between the grid surface and the sheath. Based on the direct measurement of the force of the geogrid, the present invention improves the service life of the optical fiber, prevents structural glue from changing the strength of the grid, improves the interface compatibility between the sleeve and the surface of the geogrid, and ensures that the sleeve The coordinated deformation with the geogrid is easy to operate, low in cost, and easy to popularize and use.

Description

technical field [0001] The invention relates to the fields of civil engineering monitoring, water conservancy, transportation, electric power, etc., and in particular to a method for direct measurement of geogrid stress based on fiber grating technology, including a semi-autonomous method for geogrid deformation and force measurement in reinforced soil. A design method for a tight-buffered fiber grating package, and a calibration method for direct force measurement of geogrids. Background technique [0002] In recent years, geogrids have been widely used in geotechnical engineering to reinforce soil, especially in traffic engineering and civil engineering. With the development of polymer materials, geogrid, as a new type of reinforcement material, has been vigorously applied and promoted in the field of civil engineering, and at the same time promotes the continuous improvement of the entire geosynthetics system. [0003] Scholars at home and abroad have conducted a lot of ...

AI Technical Summary

Problems solved by technology

However, due to the lack of effective tools to help experimental research on the deformation and stress value of reinforced materials such as geogrids during the reinforcement process, no more accurate conclusions have been drawn so far.

For the measurement of geogrid deformation and force, in the indoor model test of civil engineering, the deformation is relatively small, and the sensing accuracy of traditional sensors is difficult to meet the requirements; when applied in actual engineering, the rigidity of traditional sensors such as strain gauges is far greater Due to the rigidity of the geogrid itself, the measurement error is relatively large, and the accumulation of errors will lead to distortion of the monitoring results, and the harsh environment will also cause rapid aging and failure of the traditional sensor made of metal. Even if the strain value is measured, it still needs to be Combined with the elastic modulus to convert the stress value of the geogrid, if the engineering data is incomplete and the elastic modulus of the reinforced material is not available, the stress value cannot be obtained

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