Application of ground-penetrating radar in detecting the internal structures of the ancient Great Wall in Linhai City

Non-destructive testing of the internal structural characteristics of ancient buildings is the key to preserving cultural relics.To determine the structures and internal defects of the ancient Great Wall in Linhai City, this study performed non-destructive testing of the wall structures in different orientations using a ground-penetrating radar (GPR) combining 100 MHz and 270 MHz antennas.The testing results show significant structural stratification in the ancient Great Wall.The GPR signal-reflected images reveal clear internal wall defects like pores, cracks, voids, and other hidden dangers.This study demonstrates the reliability of the GPR in detecting structures and defects of ancient walls, there by providing technical support for the structural protection of the ancient Great Wall.