探地雷达在旧桥基础探测中的应用研究

发布时间：2018-06-14 11:25

本文选题：探地雷达 + 电磁波　；参考：《东北林业大学》2015年硕士论文

【摘要】：随着我国土木工程的高速发展,我国越来越多的既有建筑物由于服役年限过长,不少已经进入维修阶段,对仍需服役的老旧建筑物进行改造的任务十分重要。目前,大量的既有建筑物地基基础缺乏技术资料,即便可搜到某些建筑物竣工图,也需要对其长期使用后的地基基础现状进行再确认,方可作为技术依据进行改造设计。目前用于地球浅层的勘测工具种类较多,其中探地雷达无疑是其中最为重要的一种。该勘测工具的无损探测优势较明显,同时有能够应对较强的辐射干扰以及分辨率高的优势。通过探地雷达技术对老旧桥梁基础进行探测,可较为准确地掌握基础形态以及扩大基础的基本尺寸,给改造设计提供重要依据。本文在锦州铁路大桥雷达探测试验和宁安河西大桥雷达探测试验的基础上,结合实际探测流程和探测图像,对探地雷达在桥梁基础探测方面的应用进行研究,具体内容如下：1.阐述了探地雷达探测技术当前的应用情况,并提出了其应用的重要性,同时分析了其在桥梁扩大基础探测使用方面的优势和主要特点。引入了探地雷达探测桥梁扩大基础这一新的研究方向。2.阐述了探地雷达进行桥梁扩大基础探测的基本理论,并从浅层探测的分辨率计算来分析这种探测模式的在探测扩大基础的可行性。主要介绍的应用理论为电磁波理论,同时对麦克斯韦尔方程式以及地质浅层介质的电磁属性进行了分析。3.阐述了探地雷达野外工作的准备流程,并对采集图像的处理和解释方法进行了详细说明,分析了影响探测精度的因素。4.在两个探测试验的基础上,结合实际操作,验证了扩大基础的实际探测方法,进一步探讨了雷达参数的选择和介电常数的设置。结合试验,对比总结了扩大基础在探地雷达图像中的显现特征,以及常见的干扰情况。最后验证了探测扩大基础试验的有效性,证明探地雷达在桥梁基础的无损探测方面的应用是可行且有效的,具有重要的现实意义。
[Abstract]:With the rapid development of civil engineering in our country, more and more existing buildings in our country have entered the stage of maintenance because of their long service life, so it is very important to rebuild the old buildings which still need to be in service. At present, a large number of existing building foundation is lack of technical data, even if some building completion drawings can be found, it is necessary to reconfirm the status quo of foundation after its long-term use before it can be used as the technical basis for reconstruction and design. At present, there are many kinds of surveying tools used in the shallow layer of the earth, among which ground penetrating radar is undoubtedly the most important one. This survey tool has obvious advantages of nondestructive detection and has the advantages of strong radiation interference and high resolution. Through the ground penetrating radar technology to detect the old bridge foundation, we can accurately grasp the foundation shape and expand the basic size of the foundation, and provide an important basis for the reconstruction design. On the basis of radar detection test of Jinzhou Railway Bridge and Ningan Hexi Bridge, this paper studies the application of ground penetrating radar in bridge foundation detection based on actual detection flow and image. The concrete contents are as follows: 1. This paper expounds the current application of ground penetrating radar (GPR) technology, and points out the importance of its application. At the same time, the advantages and main features of GPR in expanding the use of bridge foundation detection are analyzed. This paper introduces the new research direction of expanding the foundation of GPR detection bridge. This paper expounds the basic theory of GPR for bridge expansion foundation detection, and analyzes the feasibility of this kind of detection mode from the resolution calculation of shallow detection. The main application theory is electromagnetic wave theory. The Maxwell equation and the electromagnetic properties of geological shallow media are analyzed. The preparation flow of field work of ground penetrating radar is described, and the processing and interpretation methods of collected images are explained in detail, and the factors that affect the detection accuracy are analyzed. On the basis of two detection experiments, combined with practical operation, the practical detection method of expanding the foundation is verified, and the selection of radar parameters and the setting of dielectric constant are further discussed. Combined with the experiments, the features of the expanded foundation in GPR images and the common interference are compared and summarized. Finally, it is proved that the application of GPR in the nondestructive detection of bridge foundation is feasible and effective, and has important practical significance.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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