Open AccessApplication Research on the Fiber Bragg Grating Sensing Technology in Arch Dam Model Test
Author(s) -
Senhao Wang,
Chen Yuan,
Tao Sun,
Bohan Yang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/780/2/022001
Subject(s) - arch dam , fiber bragg grating , strain gauge , arch , structural engineering , cracking , sensitivity (control systems) , upstream (networking) , safety monitoring , deformation monitoring , geotechnical engineering , deformation (meteorology) , engineering , materials science , optical fiber , electronic engineering , composite material , telecommunications , microbiology and biotechnology , biology
Fiber Bragg Grating (FBG) has the advantages of high sensitivity, high resolution, low cost and small volume. Therefore, FBG sensing technology is widely used in the monitoring of structural engineering. In this research, FBG sensing technology was applied in the geo-mechanical model test of arch dam for the first time. The geomechanical model of Lizhou arch dam was built, and the FBG sensors were arranged on the upstream dam surface, while the resistance strain gauges were arranged on the downstream dam surface. The model failure test was carried out to get the stress-strain state and its changing process of the dam body. The test results show that the monitoring results of the FBG sensors and the resistance strain gauges are basically consistent, and it is found that the initial cracking overloading safety coefficient is K 1 = 1.4 ∼ 2.2, the nonlinear deformation overloading safety coefficient is K 2 = 3.4 ∼ 4.3, the ultimate overloading safety coefficient is K 3 = 6.0 ∼ 6.6. The application of FBG technology provides a method to solve the problem that the strain of the upstream surface of the arch dam model cannot be directly monitored due to the insufficient space caused by the installation and loading system, and also provides a new idea for the measurement technology in the geo-mechanical model test.