地球物理学进展 ›› 2019, Vol. 34 ›› Issue (5): 2106-2111.doi: 10.6038/pg2019CC0391

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

欠阻尼中心回线瞬变电磁效应

叶子剑1,2,叶英3,张成平1,2   

  1. 1. 北京交通大学,城市地下工程教育部重点实验室,北京 100044
    2. 北京交通大学土木建筑工程学院,北京 100044
    3. 北京市市政工程研究院,地下工程建设预报预警北京市重点实验室,北京 100037
  • 收稿日期:2018-11-22 修回日期:2019-09-17 出版日期:2019-10-28 发布日期:2019-10-28
  • 作者简介:叶子剑,男,1989年生,博士研究生,工程师,主要从事隧道及地下工程方面的研究工作.(E-mail: zijianyebjtu@163.com)
  • 基金资助:
    东天山复杂地质特长公路隧道建设关键工程技术研究与应用自治区重大科技专项(2018A03003)子课题“隧道围岩精细分级与喷锚衬砌支护技术研究”(2018A03003-5)

Transient electromagnetic effect of the underdamped center loop

YE Zi-jian1,2,YE Ying3,ZHANG Cheng-ping1,2   

  1. 1. Key Laboratory of Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China
    2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
    3. Beijing Key Laboratory of Underground Engineering Construction Prediction and Precaution,Beijing Municipal Engineering Research Institute,Beijing 100037,China
  • Received:2018-11-22 Revised:2019-09-17 Online:2019-10-28 Published:2019-10-28

摘要:

瞬变电磁法经过近百年的发展,在各行各业都有广泛的应用,常规的瞬变电磁法对于天线的选择都尽可能选取临界阻尼天线,以减少过渡过程的影响.基于地震波检波器原理的启发,地震波检波器采集震动信号的过程,实质上是震动衰减转换为电磁振荡阻尼过程,欠阻尼瞬变电磁接收回线采集电磁波的过程,其实质也是电磁振荡衰减过程,两者接收都是感应电压信号,因此,欠阻尼中心回线的采集原理和地震检波器相同.本文利用欠阻尼中心回线研究探测砼结构的瞬变电磁效应,同时和过阻尼天线进行对比,说明欠阻尼天线在特点条件下探测结构体具有较强的探测能力及较高的异常分辨能力,其拟地震波图谱显示便于对异常体形状的判译.这种装置将揭开瞬变电磁法在混凝土结构探测中新的应用方向.

关键词: 中心回线, 欠阻尼天线, 瞬变电磁法, 瞬变电磁雷达

Abstract:

After nearly a century of development, the Transient Electromagnetic Method (TEM) has been widely used in various fields. To reduce the influence of the transition process, conventional selection of antenna for the transient electromagnetic method is to select critical damping antenna as far as possible. Inspired by the principle of the seismic geophone, the process of seismic geophone collecting vibration signal essentially is the process of vibration attenuation converting into electromagnetic oscillation damping, meanwhile, the process of electromagnetic wave acquisition by an underdamped transient electromagnetic receiver essentially is the process of the electromagnetic oscillation attenuation, both of them are receive induced voltage signal. Therefore, the collection principle of the underdamped center loop is the same as that of the seismometer. In this paper, the underdamped center loop is used to study the transient electromagnetic effect in the detection of concrete structure, and the effect is compared with using overdamped antenna. It was concluded that the underdamped antenna under the characteristic condition of detection structure has strong ability, and abnormal high discernibility, and fitting seismic wave map shows that it is easy to distinguish abnormal body shape. The device will uncover new application direction of TEM in the detection of concrete structure.

Key words: Central loop, Underdamped antenna, Transient Electromagnetic Method (TEM), Transient Electromagnetic Radar (TER)

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