探地雷达对不同埋深和管径非金属管线的探测分析

Analysis on Detection of Non-metallic Pipelines in Different Burial Depths and Diameters by Ground Penetrating Radar

采用探地雷达,对不同埋深、相同直径和相同埋深、不同直径的非金属管线探测结果进行了分析。研究结果表明:非金属管线反射,能随着埋深增加而急剧衰减;目标体的反射弧形能量由中间向两翼明显衰减,且衰减速度随着埋深的增加而明显增快;相对埋深较小时,反射弧形的宽度随着埋深而增大;相对深度较大时,反射弧形的宽度随着深度而减小;在相同条件下,非金属管线反射能与直径成正比关系;土体对雷达波具有低通效应,反射波的中心频率有所降低,雷达对非金属管线的分辨率有所降低。

In this paper, non-metallic pipelines in different burial depth and same diameter, or in same burial depth and different diameter were detected by ground penetrating radar, and then the detection result was analyzed. The study results show that the reflected energy of the non-metallic pipelines attenuates abruptly with increase of the depth; the reflected arc energy of the target body attenuates obviously from the middle to both edge of the are, and the attenuation speed increases obviously with increase of the depth; where the depth is relatively small, the width of the arc increase with the depth, and where the depth is relatively large, the width decreases with the depth; under the same conditions, the reflected energy is directly proportional to the diameter; due to low-pass effect of soil mass on radar wave, both the center frequency of the reflected wave and the radar＇s distinguishability of non-metallic pipelines decreases to an extent.