Detection of abandoned water-filled mine tunnels using the downhole transient electromagnetic method
Detection of abandoned water-filled mine tunnels using the downhole transient electromagnetic method
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DOI：
10.1080/08123985.2020.1746182
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发表时间：
2020-05
影响因子：
0.9
通讯作者：
Peng Wang;Mingxing Li;Weihua Yao;Chao Su;Yi Wang;Qing Wang
中科院分区：
文献类型：
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作者：
Peng Wang;Mingxing Li;Weihua Yao;Chao Su;Yi Wang;Qing Wang
我国各大煤矿区大量废弃的地下水巷道，其位置不明，对现代煤矿的安全生产构成了威胁。需要能够快速准确地确定隧道位置和大小的地球物理方法。井下瞬变电磁法在井中的应用具有很大的探测潜力。采用三维时域有限差分（FDTD）方法，结合充水隧道模型，模拟了隧道的异常响应和参数影响。结果表明，该方法响应清晰，对充水隧道的检测具有明显的效益。在中国陕西省一个废弃矿井附近的勘探孔中采集了响应信号的三个分量。信号的三个分量，特别是水平分量，显示出明显的异常。我们比较了三种不同的反演方法：（1）使用总（原始+异常）场的三个分量;（2）异常场的三个分量;（3）使用异常场的水平分量。三次反演结果基本一致，与试验孔附近密集分布的勘探孔的勘探结果雅阁。研究表明，井下瞬变电磁法有效地解决了钻孔附近充水巷道的探测和定位问题。这些信息是对废弃煤矿巷道地球物理探测的宝贵补充。
Many abandoned water-filled mine tunnels at unknown locations in major coal fields in China pose a hazard to the safe production in modern mines. Geophysical methods with rapid and accurate determination of the location and size of the tunnels are needed. The downhole transient electromagnetic method (TEM) applied in a borehole has significant potential for detection. A 3D finite-difference time–domain (FDTD) modelling method was used to simulate the anomalous response and parameter influence in conjunction with a model of a water-filled tunnel. The results show that the method gives a clear response and has distinct benefits for the detection of water-filled tunnels. Three components of the response signal were collected in an exploration hole in the vicinity of an abandoned mine in Shaanxi Province, China. The three components of the signal, especially the horizontal components, indicated obvious anomalies. We compared three different inversion procedures: (1) using three components of the total (primary + anomalous) field; (2) three components of the anomalous field and (3) using the horizontal components of the anomalous field. The results of the three inversions are almost the same and accord with the exploration result from densely distributed exploration boreholes nearby test borehole. The study showed that the downhole TEM effectively solves the problem of detecting and locating water-filled tunnels in the vicinity of a borehole. This information is a valuable complement to the geophysical detection of abandoned coal mine tunnels.