地球物理学进展 ›› 2019, Vol. 34 ›› Issue (1): 365-370.doi: 10.6038/pg2019CC0535

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

高频电磁法检测地下管线周边地质病害体的应用研究

任宝宏1,2   

  1. 1. 中国海洋大学海洋地球科学学院,山东青岛 266100
    2. 山东正元地球物理信息技术有限公司,济南 250101
  • 收稿日期:2018-12-04 修回日期:2019-01-18 出版日期:2019-02-20 发布日期:2019-04-15
  • 作者简介:任宝宏,男,1971年生,内蒙古察右中旗人,博士,高级工程师,主要研究方向为海洋能源勘探和开发利用、应用地球物理技术.(E-mail: 184211072@qq.com)

Application of high frequency electromagnetic method to detect geological diseases around underground pipelines

REN Bao-hong1,2   

  1. 1. College of Marine Geosciences,Ocean University of China,Shandong Qingdao 266100, China
    2. Shandong Zhengyuan Geophysical Information Technology Company Limited, Jinan 250101, China
  • Received:2018-12-04 Revised:2019-01-18 Online:2019-02-20 Published:2019-04-15

摘要:

地下管线是城市生存和发展的基础,近年来随着城市地下空间的开发利用,管线周边形成了各种各样的地质病害体.为了有效预防这些病害体对地下管线安全运行的影响,本文在分析高频电磁波传播机理及影响因素基础上,研究了利用探地雷达检测地下管线周边病害体的技术方法.探地雷达工作参数的配置选择、干扰波的有效处理及雷达图像的精准识别是检测地质病害体的关键,重点从这三个方面进行了分析研究.天线中心频率、采样率、测点点距等工作参数最佳优化组合,确保了检测检测目标体的效果;增益调整、频率滤波、点平均等对干扰波的处理,有助于获得高信噪比,可获得高分辨率的雷达图像;根据雷达剖面图上异常波形特征来判断识别脱空、空洞、疏松体和富水体等地下病害体的位置及大小.这些问题的解决可为探地雷达检测病害体提供可靠技术支撑.最后结合工程实例,与其他方法对异常体的对比分析,验证了高频电磁法在检测地下病害体的的可行有效性,也为开展地下管线周边病害体的治理提供了科学依据.

关键词: 高频电磁波, 探地雷达, 地下管线, 地质病害体

Abstract:

Underground pipelines are the basis for urban survival and development. In recent years, with the development and utilization of urban underground space, various geological diseases have been formed around pipelines.In order to effectively prevent the influence of these diseases on the safe operation of underground pipelines, the dissemination mechanism and influencing factors of high frequency electromagnetic wave are analyzed in this paper.This paper also studies the technical method of using Ground Penetrating Radar (GPR) to detect the diseases around underground pipelines.The key to detect geological diseases is the selection of working parameters of ground penetrating radar, the effective processing of jamming waves and the accurate recognition of radar images.This paper focuses on the analysis and research from these three aspects.The optimal combination of antenna central frequency, sampling rate and measuring point distance ensures the detection effect of target.The processing of jamming wave by gain adjustment, frequency filtering and point average is helpful to obtain high signal-to-noise ratio and high resolution radar image.Based on the abnormal waveform characteristics of radar profiles, the location and size of underground diseases such as voids, voids, loose bodies and water-rich bodies can be identified.The solution of these problems can provide reliable technical support for ground penetrating radar detection of disease bodies.Finally, the feasibility and validity of high frequency electromagnetic method in detecting underground disease bodies are verified by comparing with other methods and combining with engineering examples. It also provides a scientific basis for the treatment of the surrounding disease bodies of underground pipelines.

Key words: High frequency electromagnetic wave, Ground Penetrating Radar(GPR), Underground pipeline, Geological disease

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