3-D GPR technique was applied to conduct the physical experiments for roadbed cavity detection. The physical experiment has employed the soil characteristics of mainly sand-sized soils. The simulated cavities with dome-shaped structure were installed at regular intervals in spatial distribution. The land surface of the site was not paved with asphalt concrete at the current stage of the experiments. The results of the experiment at the current stage show that the reflection patterns from the simulated cavities are hyperbolic returns typical to the point source in 2-D perspective. The signal noises such as clutters attributed to the soil compaction differences are widely present on the 2-D and 3-D data. A closer inspection of 3-D GPR volume data has yielded more clear interpretation than 2-D GPR data regarding where the cavities are situated and what kind of shape the cavities are imaged in space. Careful inspection of the 2-D and 3-D GPR data should be applied to the cavity detection. This study is an ongoing project of KIGAM and more realistic conditions of the underground environments in the physical experiments would be prepared for future studies.


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