Application Of Fiber Bragg Grating Measurement Technology In Slope Engineering

With the continuous innovation of engineering testing technology and the demands of the new situation, the FIBER BRAGG GRATING testing technology has been used in the superstructure of civil engineering, and makes the testing mechanical quantity of the complex structure more easy and more feasible. In the slope engineering, some objective factors make the fiber Bragg grating testing technology has not been application commendably, but in recent years, more and more engineering experts and scholars have been being in the exploration of its application, in order to achieve the popularity of the application in the slope engineering.1. In the slope engineering, and the common physical quantities associated with the stress and strain are the slope displacement, anchor tension and anti-slide pile bending moment, etc., the paper drived the theory of the fiber Bragg grating sensor and the temperature compensation method, analyzes the related errors, points out the matters needing attention during the installation and its application condition.2. Based on the indoor model testing study of high and steep slope disaster caused by continuous heavy rainfall, the fiber Bragg grating testing technology is applicated in the geotechnical slope centrifuge test for the first, the fiber Bragg grating beam of constant strength displacement sensor, the fiber Bragg grating anchor testing elements and the anti sliding pile bending moment testing elements is researched and developed for the very purpose. The paper introduced the fiber Bragg grating test system, the test process and the test methods. The test results show that the fiber Bragg grating test technology is in line with the actual testing regular pattern and the testing technology is feasible. Compared with the traditional testing methods, the fiber Bragg grating testing technology has high precision, but it also has its limitations, it need to be combined with the sensor technology.3. Analysis the application of the fiber Bragg grating testing technology in the practical engineering project in detail. In Wanzhou railway slope engineering, the protection and supporting structure consist mainly of passive protective net, active protection net, anchor cable, retaining wall and anti slide pile. The paper introduce the installation of the fiber Bragg grating sensor testing system and the installation of the protection and support structure, and the analysis results of the application indicate that the operation monitoring system is stable, the fiber Bragg grating testing technology monitor dynamically the various physical quantities of the slope protection structure and the supporting structure effectively, so as to identify effectively thestatus of soil and rockfall of the slope,and send out a warning and alarm signal and toensure the safe operation of the railway effectively. The fiber Bragg grating testing technology provides a good reference for successful application in Yichang-Wanzhou railway slope engineering for similar projects later. In Guang Shan expressway, the comparison with the traditional testing technology indicated that the data measured by the fiber Bragg grating testing technology is stability and strong regularity, and the sensor can be used repeatedly.Through the theoretical derivation and comparing analysis with the traditional testing technology, a conclusion can be drawn:the fiber Bragg grating testing technology, which can realize distributed sensing and real-time continuous data acquisition, has small size effect, high reliability,strong corrosion resistance, strong anti electromagnetic interference, high sensitivity, high precision and long service life; it can be used in slope engineering well, and it has a good development prospect and extensive application prospect.