Method for measuring geogrid deformation and stress by utilizing fiber bragg grating

Abstract

The invention discloses a method for measuring geogrid deformation and stress by utilizing a fiber bragg grating, comprising the following steps: connecting a strain fiber and a sensing fiber with longitude gate or latitude gate of the measured geogrid by adopting a structural adhesive and a banding manner; laying a temperature compensation sensing fiber on the adjacent longitude gates or latitude gates of the measured geogrid; manufacturing a sensing fiber armoring structure; packing geogrid longitude gate or latitude gate laid with sensing fibers by adopting adhesive tapes after the laying of sensing fibers on the measured geogrid is finished; laying and installing the geogrid which is laid with sensing fibers and finishes protection structure in place; one end of sensing fiber bragg grating leads out and is connected with a fiber optic jumper joint to enter into a distributed fiber measuring system. The method of the invention is simple and easily operated, has low cost and can accurately measure the deformation and stress of the geogrid, and the measuring precision can satisfy project actual measuring demands.

Description

technical field [0001] The invention relates to a kind of deformation and force monitoring of geogrid used in soil reinforcement work of civil engineering, water conservancy, electric power, transportation and other projects, especially relates to a method of using optical fiber grating to measure the deformation and force of geogrid Methods. Background technique [0002] At present, geogrids are widely used in soil reinforcement work in civil engineering, water conservancy, electric power, transportation and other projects, but the function of geogrids in soil reinforcement cannot be accurately quantified due to the lack of effective measurement methods Therefore, the design of geogrid in soil reinforcement can only be designed according to relevant regulations and specifications using empirical methods. In the past, measurement methods such as strain gauges were used to try to measure the deformation of reinforced geogrid in soil. However, due to the rigidity of the monit...

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Problems solved by technology

[0002] At present, geogrids are widely used in soil reinforcement work in civil engineering, water conservancy, electric power, transportation and other projects, but the function of geogrids in soil reinforcement cannot be accurately quantified due to the lack of effective measurement methods Therefore, the design of geogrid in soil reinforcement can only be designed according to relevant regulations and specifications using empirical methods. In the past, measurement methods such as strain gauges were used to try to measure the deformation of reinforced geogrid in soil. However, due to the rigidity of the monitoring instrument structure itself, such as traditional strain gauges, is much greater than that of reinforced geogrids, there is a large error between the measurement results and the actual situation, resulting in the reinforcement of the soil in such projects. Attempts to measure the deformation and force of the grid ended in failure, and the current measurement methods for the deformation and force of the soil-reinforced grid are basically blank

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