基于GprMax的地下梯形空洞形状特征对探地雷达图像影响规律研究OA

To gain a deeper understanding of the GPR response to trapezoidal cavities with varying geometries,this study employs the GprMax software to conduct forward simulations of trapezoidal cavities with different waist slopes and filling media and systematically analyzes the influence of trapezoidal cavity geometry and filling media on radar signals.The results indicate that the upper base of the inverted trapezoidal cavity causes significant attenuation of the reflected signal and is more likely to cause multiple reflections.In contrast,the B-scan image of a normal trapezoidal cavity clearly displays its outer contour.It is also found that as the waist slope k of the trapezoidal cavity gradually decreases,the reflected signal received by the radar becomes stronger.For cavities filled with air,a clear reflection signal is observable when the waist slope k<2.For cavities filled with water,a clear reflection signal is observable when the waist slope k<4/3.