探地雷达在城市工程勘察中的应用研究

发布时间：2018-03-31 12:49

本文选题：探地雷达　切入点：城市工程勘察　出处：《安徽理工大学》2017年硕士论文

【摘要】：地下空洞、管线以及既有建筑的基础是城市工程勘察中的主要目标,对其进行准确的探测可为城市工程的施工提供保障;而探地雷达作为一种新的城市工程勘察方法,具有无损、高速、高精度、高分辨率和低成本等特点,目前已成为城市工程勘察主要的地球物理探测手段。因此,本文重点研究探地雷达在城市工程勘察中的应用,开展的工作包括:(1)阐述探地雷达的理论基础和工作原理,总结探地雷达的应用范围,论述探地雷达的资料处理过程、数据成像方法以及数据解释方法;(2)阐述时间域有限差分法(FDTD)的基本理论,针对城市工程勘察中的地质问题,依据现场实际情况,通过设置不同的异常体模型并进行正演模拟,分析电磁波的响应规律和特征;(3)以现场采集的探地雷达数据为基础,结合正演模拟的结果,解释并分析探地雷达对不同地质异常体的成像效果和识别的准确性。通过开展以上工作,本文取得了如下认识:(1)通过探地雷达的正演模拟,实现了对空洞以及管线的正演模拟研究。正演模拟的结果为实测中准确识别异常体特征提供参考。(2)以工程为例,总结了城市道路下方的空洞、不密实带、管线以及隐伏桥墩基础的探地雷达图像特征以及识别方法。通过实际探测,论证了探地雷达在城市中的无损检测是行之有效的。
[Abstract]:The foundation of underground cavities, pipelines and existing buildings is the main target of urban engineering survey, and accurate detection of them can provide guarantee for urban engineering construction, while ground penetrating radar is a new method of urban engineering investigation. With the characteristics of nondestructive, high speed, high precision, high resolution and low cost, it has become the main geophysical method of urban engineering survey. Therefore, this paper focuses on the application of ground penetrating radar in urban engineering survey. The work carried out includes: (1) expatiating the theoretical basis and working principle of GPR, summarizing the scope of application of GPR, and discussing the data processing process of GPR. The basic theory of FDTD (finite difference method in time domain) is expounded. Aiming at the geological problems in urban engineering survey, according to the actual situation in the field, different abnormal body models are set up and the forward modeling is carried out. Based on the ground penetrating radar data collected on the spot, combined with the result of forward simulation, the response law and characteristic of electromagnetic wave are analyzed. To explain and analyze the imaging effect and accuracy of GPR for different geological anomalies. Through the above work, this paper has obtained the following understanding: 1) through the forward modeling of GPR, Forward modeling of cavities and pipelines is realized. The forward simulation results provide a reference for the accurate identification of abnormal body characteristics in actual measurement. Taking engineering as an example, the hollow and undense zones under urban roads are summarized. The image features and identification methods of ground penetrating radar for pipeline and hidden piers are proved to be effective in urban non-destructive testing through actual detection.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.3;TU195

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