浅埋未爆弹瞬变电磁响应特征及探测实践  

Transient Electromagnetic Response Characteristics and Probing Practices of Shallowly Buried Unexploded Ordnance

作　　者：王晓龙 唐甫 甘以津 何成阳 李朕 王鑫 Wang Xiaolong;Tang Fu;Gan Yijin;He Chengyang;Li Zhen;Wang Xin(Guangxi Nonferrous Survey&Design Institute,Nanning Guangxi 530031,China;Guangxi Beigang Planning and Design Institute Co.,Ltd,Nanning Guangxi 530200,China)

机构地区：[1]广西有色勘察设计研究院,广西南宁530031 [2]广西北港规划设计院有限公司,广西南宁530200

出　　处：《工程地球物理学报》2024年第5期837-846,共10页Chinese Journal of Engineering Geophysics

基　　金：广西壮族自治区科技项目(编号:2023-JKBFAE-F3003)。

摘　　要：为了研究寻找埋藏在地下未爆弹的有效方法,采用等值反磁通瞬变电磁法进行试验。等值反磁通瞬变电磁法探测试验内容包括改变发射线圈的电流强度和改变测线方向,即测线沿已知弹体长轴和短轴方向布置。结果表明:发射线圈的电流强度大小、不同激励场方向,沿弹体长轴、短轴方向的瞬变电磁响应场异常形态有明显差异。短轴方向测线的多测道曲线形态较复杂;长轴方向测线的多测道曲线在早期主要呈现单峰异常,峰值位于弹体上方,异常相对简单,多测道视电阻率等值线图曲线“U”字形下凹形态,下凹中心位于弹体上方。试验结果应用于未爆弹的实际探测工作中,采用大发射电流,遇到复杂异常适当改变测线方向,取得了较好的探测效果。In order to search an effective method for unexploded ordnance buried in the ground,the opposing coils transient electromagnetic method was used for experiments.The transient electromagnetic detection test includes changing the current intensity of the transmitting coil and changing the direction of the survey line,where the survey line is arranged along the long and short axes of the known unexploded ordnance.The test results show that the current intensity of the emitting coil and the direction of the different excitation fields have obvious differences in the abnormal morphology of the transient electromagnetic response field along the long axis and the short axis of the unexploded ordnance.The multi-track curve shape of the short-axis survey line is more complicated;in the early stage,the multi-track curve of the long-axis line mainly presents a single-peak anomaly,the peak value is located above the unexploded ordnance,and the anomaly is relatively simple,and the multi-track resistivity contour curve is concave in a“U”shape,and the center of the concave is located above the unexploded ordnance.The test results are applied to the actual detection of unexploded ordnance.During the construction,a large emission current was used to appropriately change the direction of the survey line in case of complex abnormalities with a good detection effect.

关 键 词：等值反磁通瞬变电磁法 未爆弹 响应特征 全区视电阻率 

分 类 号：P631.3[天文地球—地质矿产勘探]