地下非金属管线探地雷达图像特征的研究及应用

Research and Application of the GPR Image Characteristics of Underground Nonmetallic Pipelines

探地雷达技术是目前地下非金属管线探测的主要方法,开展地下管线的探地雷达异常特征的研究可大幅提高其探测方法的有效性和精度,同时还发现了一些新规律并加以应用。本文针对探地雷达运用的一些关键点,从模型实验研究入手,深入探讨和剖析了影响非金属管道探测的几个因素,并根据模型实验和大量的实际探测结果,提出了管道内载体的电性参数是决定管线异常图像特征的首要因素。另外,首次提出了按照非金属给水管的多次反射波间距计算其管径的公式,并得到了不同管径的实例验证,为探地雷达在城市地下管线普查中的应用提供新的借鉴。

Recently,The GPR is a commonly used method in the underground nonmetallic pipeline survey. The research of the image characteristics of underground pipelines can increase the efficiency and accuracy of this method significantly. At the same time, it can also discover some new rules and application of them. This paper focuses on some key points in the application of the GPR, begins with the study of model experiment, thoroughly analyses several factors which have effect on underground nonmetallic pipeline survey, and states that electrical parameter of pipeline carrier is the most important factor which determines the GPR image characteristics of pipelines. In addition, it presents a formula of calculating the diameter of nonmetallic waterline , according to the distance of the multiple reflected wave of GPR at the first time. The formula is confirmed by the actual survey and provides a new method of the application of the GPI~ in urban underground utilities general survey.