Recognition of Rebar in Ground-Penetrating Radar Data for the Second Lining of a Tunnel

Ground-penetrating radar (GPR) detects a tunnel with relatively low-frequency electromagnetic waves, which can result in poorly characterized reinforced steel bar (rebar) hyperbolas and make it challenging to recognize rebar. Thus, the rebar is located by using attenuation reflection coefficients, hyperbolic feature of reconstructed for recognition. Due differences properties other media second lining, position one-dimensional time wave diagram (A-scan) determined coefficients. The recognized at peak point A-scan. This opposite phase incident wave. amplitude these peaks smaller than adjacent points. Then, negative points are on two-dimensional scanning data (B-scan). Finally, method applied Husa Tunnel Yunnan Province, China. Moreover, mileage section YK81+506–YK81+542 Tunnel, evident, appears region 5–7 ns B-scan.