论文部分内容阅读
根据顶板离层的结构特点构建了三层介质模型,通过模拟观察电磁波的传播衰减特征与覆岩介质介电常数的关系,研究相对介电常数的差异对地质雷达探测效果的影响。基于时域有限差分法,运用GPRmax软件对二维电磁波在不同介质的自由空间中的传播进行正演模拟。对4种不同性质的覆岩进行离层探测,得出当顶板离层与围岩的相对介电常数差异越大时其探测的效果更佳。使用Seeker SPR 500EX地质雷达系统进行物理模拟实验,运用Reflex W2D数据分析软件对实验结果进行分析,得到良好的探测结果。
Based on the structural characteristics of the roof delamination, a three-layer model was constructed. The relationship between the propagation attenuation characteristics of electromagnetic wave and the dielectric constant of the overburden was simulated to study the influence of the relative dielectric constant on the detection performance of the GPR. Based on the finite difference time domain method, GPRmax software was used to simulate the propagation of two-dimensional electromagnetic wave in the free space of different media. Four different types of overlying strata were detected, and the results show that the detection effect is better when the relative permittivity difference between the roof detachment and the surrounding rock is larger. Physical simulation experiments were carried out with Seeker SPR 500EX geologic radar system. Reflex W2D data analysis software was used to analyze the experimental results to obtain good detection results.