在有金属干扰的城市地区应用对置线圈瞬态电磁法

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

对置线圈瞬变电磁法(OCTEM)采用小型弱耦合发射-接收线圈配置,有助于减少副作用和提高探测分辨率。凭借这些优势,该方法已被广泛应用于浅层地下目标探测。然而,在城市地区使用该方法时,测量数据可能会因附近金属物体的电磁干扰而失真。在实际应用中,有必要进行建模,为测量数据分析提供指导。本文介绍了两个 OCTEM 应用案例,用于探测附近有金属物体的城市地区浅层地下岩溶洞穴。为研究附近金属物体的干扰效应,进行了相应的建模。第一个应用案例是垂直钢塔的电磁干扰,通过建模,其影响距离可达 9 米。第二个应用案例是薄铝栅栏的电磁干扰,通过建模,其影响距离可达 6 米。只有当观测点位于影响区之外时,才能忽略金属的影响。而在影响区内进行测量时,则不能忽略金属影响。然而,由于附近的金属物体主要影响早期数据,因此在目标响应强于金属干扰或目标响应时间窗口宽于金属干扰的条件下,也可能检测到地下目标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of opposing coils transient electromagnetic method in urban area with metal interference

Opposing coils transient electromagnetic method (OCTEM) adopts small and weak-coupling transmitting-receiving coils configuration, which helps to reduce side effect and improve the detection resolution. With such advantages, it has been widely used for shallow sub-surface target detection. However, when the method is used in urban area, measured data may be distorted by electromagnetic (EM) interference from nearby metal objects. In practical application, it is necessary to perform modelling to provide guidance for measuring data analysis. Two OCTEM application cases in detecting shallow sub-surface karst caves in urban area with metal objects nearby are presented in this paper. Corresponding modelling are carried out to study the interference effect of the nearby metal objects. The first application case is about the EM interference of a vertical steel tower, of which the influence distance reaches up to 9 m by modelling. The second application case is about the EM interference of a thin aluminum fence, of which the influence distance reaches up to 6 m by modelling. Only when the observation is outside the influence zone, the metal influence can be ignored. When the measurement is inside the influence zone, the metal influence cannot be ignored. However, as the nearby metal objects mainly affects the early data, the subsurface target may also be detected in condition that the target response is stronger than the metal interference, or the target response time window is wider than that of the metal interference.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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