瞬变电磁道路雷达研究

Research on Transient Electromagnetic Road Radar

摘要: 城市道路是城市基础设施的重要组成部分，地质雷达技术以其无损、快捷、浅层高分辨率的优势被广泛应用于城市道路检测中。由于高频微波段地质雷达穿透能力的局限性，使得城市道路病害及成因检测存在许多难题。本文首次利用瞬变电磁法原理，区别地质雷达高频一次场而采用瞬变电磁法的二次场，利用浅层瞬变电磁法原理、中心回线装置、全期视电阻率计算、雷达波谱图像处理与工作装置等技术，成功研制了瞬变电磁道路雷达，并在地下管线探测、道路病害探测方面与地质雷达进行试验对比，结合试验和工程实例，验证了浅层瞬变电磁法在城市道路地下病害检测中的应用效果，总结了城市道路地下病害的视电阻率特征与类型，说明用视电阻率法探测道路地下病害的可行性，为瞬变电磁法在城市道路检测方面开辟新的应用。

Abstract: Urban road is an important part of urban infrastructure, GPR technology has been widely used in urban road detection due to its advantages of nondestructive, fast, shallow and high resolu-tion. Due to the limitation of penetrating capability of high frequency microwave geological ra-dar, there are many problems in detecting urban road diseases and their causes. This paper uses the principle of transient electromagnetic method for the first time, the secondary field of tran-sient electromagnetic method which distinguishing the high frequency primary field of the ground penetrating radar, the theory of shallow transient electromagnetic method, center loop device, full time apparent resistivity calculation, radar spectrum image processing and working device, etc. to develop transient electromagnetic road radar and compare with GPR in aspects of underground pipeline detection and road disease detection. The application effect of shallow transient electromagnetic method in urban road underground disease detection is verified by engineering examples. The characteristics and types of apparent resistivity of urban road un-derground diseases are summarized, and the feasibility of using apparent resistivity method to detect road underground diseases is illustrated, which opens up a new application for TEM in urban road detection.