Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (6): 1755-1764.doi: 10.16285/j.rsm.2020.1673

• Testing Technology • Previous Articles    

Strain monitoring mechanism of geogrids based on optical fiber sensing technology

HONG Cheng-yu1, 2, YANG Qiang1, 2, ZHAO Yong3, CHEN Deng-wei3, YU Wei3   

  1. 1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China; 2. Underground Polis Academy, Shenzhen University, Shenzhen, Guangdong 518060, China; 3. China Railway Southern Investment Group Co., Ltd., Shenzhen, Guangdong 518000, China
  • Received:2020-11-08 Revised:2021-04-14 Online:2021-06-11 Published:2021-06-16
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (U2034204) and the General Program of National Natural Science Foundation of China (52078303).

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Abstract: The fiber Bragg grating (FBG) sensor is an important tool to measure the surface strain of geogrid. There is a strain transfer coefficient between the real strain of geogrid and the strain measured by FBG sensor due to the existence of adhesive layer. In this study, by taking surface-bonded bare fiber Bragg grating as the research object, the strain transfer formula between fiber layer and matrix layer is derived by establishing the theoretical model of fiber layer, adhesive layer and matrix layer. In addition, the effects of material parameters on the strain transfer coefficient and the average strain transfer coefficient are analyzed. Then, through laboratory tensile test and verification test, the correctness of this newly proposed theory for strain transfer is verified. The results show that the maximum error between the measured value and the theoretical value is about 15%. According to the parameter analysis, the influence of different material parameters on the average strain transfer coefficient can be arranged in a descending order as follows: the FBG bond length, the thickness of the adhesive layer, the shear modulus of the matrix layer, the width of adhesive layer and the shear modulus of adhesive layer, accounting for 33%, 23%, 20%, 13% and 11% respectively.

Key words: fiber Bragg grating, geogrid, adhesive layer, strain transfer

CLC Number: 

  • TP212
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