Method of Measuring Deformation and Force of Geotextile Stressed Structure Using Distributed Optical Fiber

Abstract

A method using distributed type optical fibers to measure stress structure deformation and stress of geotechnical cloth comprises the steps of cleaning the positions, to be test, on the surface of the geotechnical cloth, laying and fixing two groups of parallel sensor fibers on the surface of the geotechnical cloth to be test in a gluing mode, respectively leading out jumper wire connector from ends of the two groups of sensor fibers, connecting the jumper wire connectors of the sensor fiber with connecting cables which are connected with a distributed type optical fiber measuring instrument, measuring strain and deformation data of the geotechnical cloth through the distributed type optical fiber measuring instrument, and calculating the stress situation of the geotechnical cloth according to the strain and deformation data. In addition, one group of sensor fibers are measuring fibers, and the other group of sensor fibers are measuring and comparing fibers. The method is convenient, simple and practical, low in cost and capable of accurately measuring deformation and stress of a large-deformation geotechnical cloth stress structure. The measuring accuracy of the method can meet actual engineering measurement requirements. Furthermore, groups of fibers are used for comparing and analyzing data so as to improve measuring accuracy.

Description

technical field [0001] The invention relates to a measurement method, in particular to a method for measuring deformation and force of geotextile stressed structures by using distributed optical fibers. Supported by the National High-tech Research and Development Program (863 Program) (project number: 2012AA112509). Background technique [0002] At present, geotextiles are used to sew filling bags, and the embankment technology of large-scale filling bags filled with sand in the bags has been widely used. Due to the lack of effective measurement methods, it is impossible to evaluate its function accurately and quantitatively, so that the selection and design of geotextile materials can only be designed according to empirical methods. The deformation and stress of the structure are monitored, but the measurement range of the general strain gauge is much smaller than the deformation range of the geotextile stressed structure, and it is impossible to effectively detect the def...

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Problems solved by technology

[0002] At present, geotextiles are used to sew filling bags, and the embankment technology of large-scale filling bags filled with sand in the bags has been widely used. Due to the lack of effective measurement methods, it is impossible to evaluate its function accurately and quantitatively, so that the selection and design of geotextile materials can only be designed according to empirical methods. The deformation and stress of the structure are monitored, but the measurement range of the general strain gauge is much smaller than the deformation range of the geotextile stressed structure, and it is impossible to effectively detect the deformation and stress of the geotextile stressed structure, and a large-scale displacement is also tried. However, since the displacement meter's monitoring instrument structure itself is much greater than the stiffness of the geotextile, a large error is formed between the measurement result and the actual situation, resulting in the deformation and stress of the geotextile's stressed structure in such projects. The measurement attempts ended in failure, and the current measurement methods for geotextile stress structure deformation and force are basically blank

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