ABSTRACT
A Geogrid integrated with Fiber Bragg Grating (FBG) sensors, which was referred as smart ge-ogrid in this paper, has been developed for deformation measurement. The Geogrid is fabricated by gluing the FBG arrays on the surfaces of the steel-plastic composite geogrid. To reduce the accumulative errors as well as improve the measurement accuracy, a rule-based deformation classifying and reconstructing method for the smart geogrid was proposed. This method employed the strain increments of the geogrid to determine the deformation classes for all the segments of the geogrid, and then correct the reconstructed deformation according to different shapes. The Finite Element (FE) simulations as well as experiments were performed to validate the feasibility of the proposed method. The results indicated that the proposed method provides higher accuracy compared with the deformation without correction. It decreased the maximum absolute error from 6.1cm to 1.3cm in the experiment. Therefore, the classified deformation reconstructing method for the smart geogrid integrated with FBG successfully increased the measurement accuracy, which has great practical value in geotechnical engineering-related applications.
