3/18AM (General session) Rock Engineering / Mining techn

[2K0101-08-07] Research on improving the visual detection performance of tunnel crack model by GPR based on numerical simulation

○Zhuke - Zhang^{1[Master’s course]}, Junichi Takekawa¹ (1. Kyoto university)

Chairperson: Kuniyuki Miyazaki (AIST)

Keywords:GPR, crack detection, phased array source, reverse time migration

As a widely employed non-destructive testing method, Ground Penetrating Radar presents challenges in the interpretation of its direct output results. To obtain more intuitive outcomes,high-resolution imaging results were achieved through the application of the reverse time migration method combined with phased array sources. In the test utilizing a random crack model generated by Perlin noise, the imaging results under this method accurately reflected various parameters such as crack location and shape. Subsequently, leveraging the characteristics of tunnel structures and the reverse time migration algorithm, the imaging results were further enhanced by utilizing the information from reflected waves generated at the inner boundary of tunnel structures and the multiple waves generated at the crack location. Finally, a quantitative evaluation method was conducted on the various imaging results.