This study proposed an analytical model to investigate strain transfer mechanism between FBG sensor and measured geogrid. Both geometric and mechanical parameters (bonding length, bonding thickness, bonding width, and Young's modulus) of interaction interface can be taken into account in this model. Both laboratory tensile tests of geogrid and experimental data in published literatures were used to verify the developed model. Validation study shows that the maximum relative error between experimental values and theoretical values is 8.2%, indicating that this theoretical model can be used to reflect geogrid deformation. Parametric study indicates that bonding length, bonding thickness, bonding width, Young's modulus of adhesive layer, and substrate layer have significant influence on strain transfer coefficient. Grey Relational Analysis (GRA) method was used to analyze influencing sensitivity of different parameters. GRA parameter values of bonding width and length are higher than 0.72, indicating that bonding width and bonding length are relatively dominant factors affecting average strain transfer coefficient in comparison with bonding thickness, Young's moduli of substrate and adhesive layers (their related GRA values are all lower than 0.692).

本研究提出了一种分析模型来研究 FBG 传感器与被测土工格栅之间的应变传递机制。该模型可以同时考虑相互作用界面的几何和力学参数（键合长度、键合厚度、键合宽度和杨氏模量）。土工格栅的实验室拉伸试验和已发表文献中的实验数据都用于验证开发的模型。验证研究表明，实验值与理论值的最大相对误差为8.2%，表明该理论模型可用于反映土工格栅变形。参数研究表明，粘接长度、粘接厚度、粘接宽度、粘接层的杨氏模量和基体层对应变传递系数有显着影响。采用灰色关联分析(GRA)方法分析不同参数的影响灵敏度。键合宽度和键合长度的GRA参数值均大于0.72，说明键合宽度和键合长度与键合厚度、基材和胶层的杨氏模量相比，是影响平均应变传递系数的相对主导因素（它们的相关GRA值均较低）比 0.692）。