高频大地电磁论文高频大地电磁法在隧道勘察与探测中的应用研究

1、高频大地电磁论文：高频大地电磁法在隧道勘察与探测中的应用研究【中文摘要】近年来,铁路建设工程量大且项目繁多,其中长大隧道的地质勘探一直以来都是较为复杂的工程难题。本文结合某隧道的实际应用情况,探讨了高频大地电磁测深的基本理论,介绍了近年来应用较为普遍的电磁仪器：EH4电导率成像仪,并对该仪器的相关理论和方法作了较为详细的研究,包括基本理论、工作方式和方法、数据采集和数据处理、相关技术研究等内容。最后,将EH4系统应用于工程实例,着重对成果图进行分析解释,在此基础上划分围岩等级,并对工程施工提出合理建议。EH4系统具有较好的应用效果和前景,但由于技术封装十分严密,目前对其认识尚有不足,因此,对其

2、技术进行深入细致的研究则是本文的重点。首先研究其输出文件内容成为本文的一个重点,如果能详细了解该内容,不仅能为后续数据处理提供保障,还能为开发新的处理方法提供依据。其次,希尔伯特-黄变换(HHT)中关于消除噪音的研究是本文的另一个重要内容,希尔伯特-黄变换是一种能够处理非线性非平稳时间序列的方法,目前该技术在许多领域应用广泛。通过了解与分析其理论基础,结合实例和EH4系统中数据处理功能进行了分析与论证,并得到了较好的结果。论文主要研究内容和成果包括：(1)详细地探讨了EH4系统的整个数据采集和数据处理过程。包括自带软件IMAGEM的操作和反演成图等技术；(2)成功的读取了EH4文件中的Y文件,

3、并详细分析了输出文件的内容；(3)找到简单有效的方法进行了地形修正,并能很好的应用于实际工作中；(4)通过编制程序做出了希尔伯特谱和边际谱图。为数据处理中消除噪音提供了新的方法；(5)结合工程实例分段分析物探成果图,一定程度上为物探解释工作提供了参照。【英文摘要】In recent years, railway construction has a large amount of various projects, long tunnel of geological exploration has always been complex engineering problems. The pa

4、per connected with the practical application of a tunnel in closely. First of all, The paper has studied the basic theory of the high-frequency magnetotelluric, then introduced EH4 conductivity imaging device what has more general used in recent years as electromagnetic devices and made a more detai

5、led study of theories and methods of the instrument including basic theory, working methods and methodology, data acquisition and data processing and related technology research and so on. Finally, the EH4 system has used in engineering example, focusing on analysis and interpretation of the results

6、 graph, and then based on the division of rock class, and put forward reasonable proposals for construction.EH4 system has a good application effect and prospect, but we know little about it at present because of the technology encapsulation is very rigorous. So we have to research its detailed tech

7、nical in depth. Its content of output file is one key in this paper. If the content could be understood clearly, it can guarantee the follow-up data processing, and also can provide the basis for creating new processing method. In addition, eliminate noise research section in Hilbert-Huang Transform

8、 (HHT) is another important content in this paper. Hilbert-Huang Transform is a nonlinear method which can handle non-stationary time series. This technology is in the ascendant and used widely in many areas at present. Its theoretical basis is studied, and then through the analysis the application

9、of data processing in EH4 system combined with examples, and the results is obtained satisfactorily by practice.The major research content and the achievements of the thesis are depicted as follows:(1) We have discussed the entire data acquisition and data processing of EH4 system in detail and the

10、operation and inversion mapping techniques on IMAGEM;(2) Has read Y documents of EH4 file successfully, and analysis the output files in detail;(3) To find a simple and effective method of terrain correction, and can be well applied in practical work; (4) Made the Hilbert spectrum and marginal spect

11、rum by programming, and provides a new approach To eliminate the noise in the data processing;(5) Segment analysis the Figure of Geophysical results with an engineering example, to some extent provided a reference for the geophysical interpretation.【关键词】高频大地电磁 EH4系统 功率谱 希尔伯特-黄变换 反演断面图【英文关键词】HMT EH4

12、system power spectrum Hilbert-Huang Transform inversion sectional drawing【目录】高频大地电磁法在隧道勘察与探测中的应用研究摘要6-7Abstract7-8第1章 绪论11-161.1 研究背景和研究意义11-121.2 大地电磁测深法的研究现状12-141.2.1 大地电磁测深法的国外研究现状12-131.2.2 大地电磁测深法的国内研究现状13-141.3 论文主要内容14-16第2章 高频大地电磁测深理论基础16-222.1 电磁波传播理论和亥姆霍兹方程16-182.2 视电阻率和相位18-22第3章 EH4电导率成

13、像系统及特点22-303.1 EH4电导率成像系统简介22-243.2 EH4电导率成像系统理论依据24-253.3 EH4系统工作方式及野外工作方法25-303.3.1 EH4系统工作方式25-263.3.2 EH4系统野外工作方法26-30第4章 EH4系统的数据采集与数据处理30-414.1 EH4系统的数据采集30-334.1.1 数据采集前的准备30-314.1.2 测区工地准备314.1.3 测区数据采集31-334.2 EH4系统的数据处理33-414.2.1 数据的初步处理33-364.2.2 数据的室内处理36-41第5章 EH4系统相关技术研究41-555.1 数据文件类型研究41-455.1.1 文件(位置文件)41-425.1.2 X文件(互功率谱文件)425.1.3 Y文件(时间序列文件)42-445.1.4 Z文件(阻抗文件)44-455.2 地形修正的研究45-475.3 消除噪音的研究47-525.3.1 理论研究47-505.3.2 实例分析50-525.4 分辨率和探测深度的研究52-555.4.1 分辨率的研究52-535.4.2 探测深度的研究53-55第6章 EH4系