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物探与化探  2020, Vol. 44 Issue (6): 1470-1475    DOI: 10.11720/wtyht.2020.1509
  工程勘查 本期目录 | 过刊浏览 | 高级检索 |
等值反磁通瞬变电磁法在公路隧道塌陷区的探测应用
刘杰1, 段炜2, 王俊1, 刘成1, 戴国强1
1.中国电建集团 昆明勘测设计研究院有限公司,云南 昆明 650000
2.云南省地震局,云南 昆明 650000
The application of opposing coils transient electromagnetic method to the detection of underground collapse in highway tunnel under construction
LIU Jie1, DUAN Wei2, WANG Jun1, LIU Cheng1, DAI Guo-Qiang1
1. Kunming Engineering Corporation Co., Ltd., Kunming 650000,China
2. Yunnan Earthquake Agency , Kunming 650000, China
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摘要 

某在建公路隧道开挖中发生塌陷,选用等值反磁通瞬变电磁法(OCTEM)进行抢险探测。文中介绍了OCTEM方法原理,针对公路隧道地电结构建立模型,通过正演计算证明了OCTEM具有对地电阻率反映灵敏、分辨率高的特点;将该公路隧道的OCTEM探测结果与高密度电法探测结果进行对比分析,二者异常对应良好,都反映了已知塌陷区。此次抢险探测结果表明,OCTEM设备轻便,施工便捷,作业效率高,适合浅层快速探测,可用于公路隧道塌陷区快速探测。

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刘杰
段炜
王俊
刘成
戴国强
关键词 等值反磁通瞬变电磁塌陷区快速探测    
Abstract

Collapse occurs during the excavation of a highway tunnel, and hence it is urgent to use geophysical method to detect other potential collapse areas. In view of the large difference of the terrain, the lush surface vegetation and the low resistivity of the surrounding rock, the authors selected the opposing coils transient electromagnetic method (OCTEM) as the equipment of this method which is relatively light and it has high resolution in reflecting the resistivity. Firstly, OCTEM response of underground collapses buried in conductive host was calculated, and the results theoretically proved that OCTEM was sensitive to underground resistivity and had high resolution, and then the OCTEM detection result was compared with the high-density electrometer detection result. It is proved that they correspond well, and both reflect the known collapse area. It is shown that OCTEM can be applied to rapid detection of collapse area in the highway tunnel under construction.

Key wordsOCTEM    collapse area    rapid detection
收稿日期: 2019-10-31      出版日期: 2020-12-29
ZTFLH:  P631  
作者简介: 刘杰(1984-),男,高级工程师,硕士,地球探测与信息技术专业,主要从事工程物探勘察与质量检测工作。
引用本文:   
刘杰, 段炜, 王俊, 刘成, 戴国强. 等值反磁通瞬变电磁法在公路隧道塌陷区的探测应用[J]. 物探与化探, 2020, 44(6): 1470-1475.
LIU Jie, DUAN Wei, WANG Jun, LIU Cheng, DAI Guo-Qiang. The application of opposing coils transient electromagnetic method to the detection of underground collapse in highway tunnel under construction. Geophysical and Geochemical Exploration, 2020, 44(6): 1470-1475.
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http://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.1509      或      http://www.wutanyuhuatan.com/CN/Y2020/V44/I6/1470
Fig.1  OCTEM线圈及其径切面一次场磁力线
Fig.2  塌陷体地电模型
Fig.3  不同厚度、不同埋深塌陷体OCTEM响应
Fig.4  OCTEM感应电压剖面(a)及反演电阻率断面解释成果(b)
Fig.5  高密度电阻率法反演电阻率断面及解释
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