(General session) Mining and underground construction machineries / Rock Engineering / Mining technologies［Tue. Sep 12, 2023 PM Room-2］

[1207-17-07] [Student presentation: Master’s course] Research on improving the performance of ground penetrating radar to detect defects in tunnel structures based on numerical experiment

○Zhuke Zhang¹, Hitoshi Mikada¹, Junichi Takekawa¹ (1. Kyoto University)

Chairperson: Tomoaki Satomi (Tohoku University)

Keywords:GPR, Internal disease detection, phased array source, FDTD, Reverse time migration

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.