Direct measurement method of geogrid force based on fiber bragg grating technology

Abstract

The invention discloses a direct measurement method of a geogrid force based on the fiber bragg grating technology. The direct measurement method of the geogrid force based on the fiber bragg gratingtechnology comprises two steps of packaging of a fiber bragg grating semi-tight sleeve structure and calibration method of direct measurement of geogrid force parameters, and the specific steps are asfollows: the semi-tight sleeve package structure is realized by combining sleeves with different specifications and roughness, so as to protect the grating while ensuring deformation coordination; the direct measurement of the force parameters is realized through a calibration method for measuring the geogrid force parameters and a system tensile test of the semi-tight sleeve sensing structure geogrid; and roughness treatment is applied to the sleeve of the grating section to realize interface compatibility between the grid surface and the sleeve. On the basis of the direct measurement of thegeogrid force, the invention improves the service life of the optical fiber, prevents the structural adhesive from changing the strength of the grid, improves the tightly occlusive interface compatibility between the sleeve and the geogrid surface, and ensures the coordinated deformation of sleeve and geogrid; and the direct measurement method of the geogrid force based on the fiber bragg gratingtechnology is easy to operate, low in cost and convenient for popularization 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

Images