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本文介绍了在B隧道勘查中应用高分辨电磁成像技术探测隐伏构造的一个成功实例。数据采集采用高频电磁成像系统(STRATAGEM EH4,频率范围从IHz到90kHz)。野外采集正交的电磁场分量,从地磁成像剖面中提取目标体有关电磁学信息。为获取高质量的采集数据,野外采用包含天然场源和全张量可控源的混合场源。B隧道坐落在位于中国中部的湖北省的西部,隧道埋深不到200m,但区域地质作用导致它的地质机构十分复杂。第一次勘查过程中,勘探人员误把一个脱落体的露头当成基岩面,施工过程中出现了冒顶。第二次勘探时采用高分辨电磁法和折射地震法,这次勘探找到了隐伏的基岩面和一个隐伏断裂。勘探结果与后来隧道挖掘揭示的构造吻合。
This paper presents a successful example of detecting hidden structures using high-resolution electromagnetic imaging in B-tunnel exploration. Data acquisition using high-frequency electromagnetic imaging system (STRATAGEM EH4, the frequency range from IHz to 90kHz). Field collection of orthogonal electromagnetic field components extracted from the geomagnetic imaging of the target electromagnetic information. In order to obtain high-quality acquisition data, a mixed field source containing a natural field source and a full-dose controllable source is adopted in the field. Tunnel B is located in the western part of Hubei Province, located in central China. The tunnel is buried less than 200 m deep, but its geological structure has complicated its geological structure. During the first exploration, the explorer erroneously considered the outcrop of a detached body as the bedrock surface, and the roof fell during the construction. The second exploration using high-resolution electromagnetic method and refraction seismic method, the exploration to find a hidden bedrock surface and a buried fault. The results of the exploration agree well with those revealed by later tunneling.