MMIJ Annual Meeting

The internal damage of tunnel structure has great harm to the tunnel structure, but these internal damages are difficult to detect directly. As a nondestructive detection method, GPR has been widely used in the detection of various artificial structures in recent years. In order to improve the detection ability of GPR, a phased array source is used to replace a single source and simulated by finite-difference time-domain method. The simulation results show that the phased array source has higher horizontal resolution than a single source.Then, in the numerical experiments, we applied a decay compensation reverse-time migration algorithm to invert the forward data. Finally, under the application of reverse-time migration imaging conditions, the ground-penetrating radar obtained high-resolution imaging results.