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通过一系列的实验,分析和讨论了不同上覆地层和管线内部充填物对非金属管线探测结果的影响规律。研究表明:不同地层下雷达天线耦合作用存在差异,在粘土中耦合的雷达波中心频率和频带宽度相比砂土更低;不同地层中雷达子波传播有所不同,在砂土中雷达反射波的中心频率降低和频带宽度都随深度而降低,粘土中的中心频率无明显变化,频带宽度显著变窄;因此在砂土中非金属管线的探测结果的准确性比粘土中的高。非金属管线内部充填物对非金属管线的探测准确性有较大影响,在上覆砂土的情况下,管内充填水、湿砂时的管线探测准确性比管内无充填的高。
Through a series of experiments, the influence of different overburden and pipeline filling on the detection results of nonmetallic pipeline was analyzed and discussed. The results show that there are differences in radar antenna coupling effect between different strata, and the center frequency and frequency bandwidth of the coupled radar wave in clay are lower than that of sand soil. Radar wave propagation in different strata is different. The center frequency decreases and the bandwidth decreases with the depth. There is no obvious change in the center frequency in the clay and the bandwidth of the band is significantly narrower. Therefore, the detection accuracy of the non-metallic pipeline in the sand is higher than that in the clay. Non-metallic pipelines fillings have a significant impact on the detection accuracy of non-metallic pipelines. In the case of overlying sand, the detection accuracy of pipelines filled with water and wet sand is higher than those without filling.