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| An analysis of the detection effect of cross-well electromagnetic wave CT in coal mine goaf |
ZHAO Xu-Chen1( ), LI Xue-Jian2, CAO Fang-Zhi3, LEI Xiao-Dong1(), LI Chen1, HAN Yu-Da1 |
1. Beijing Institute of Geo-exploration Technology, Beijing 100120, China
2. Shenhua Baorixile Energy Co., Ltd., Hulun Buir 021025, China
3. CNBM Geological Engineering Exploration Academy Co., Ltd., Beijing 100102, China |
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Abstract In an open-pit coal mine in Hulun Buir of Inner Mongolia, the main mining coal seams are buried in depths ranging from 39m to 90m. Before coal mine integration, predatory mining has left many mined areas with unknown geological data, and the existence of mined-out areas has brought huge safety hazards to open-pit mining stripping. In order to find out the specific location and connectivity of the underground goaf, the authors used the cross-hole electromagnetic wave CT method to probe into the inside of the goaf in detail, and obtained a lot of real and reliable geophysical data. The analytical result shows that relatively complete rock formation electromagnetic wave absorption coefficient is in the range of 0.44~0.51Nper/m, and no water-filled goaf electromagnetic wave absorption coefficient is in the range of 0.29~0.40 Nper/m. According to the difference of electromagnetic wave absorption coefficient between goaf and surrounding rocks, the authors drew the morphological interpretation map of the goaf, and the results are basically consistent with the drilling data.
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Received: 05 February 2021
Published: 20 August 2021
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Corresponding Authors:
LEI Xiao-Dong
E-mail: zxc454606073@qq.com;leixiaodong@139.com
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Ray distribution diagram between holes(a) and gridded model of electromagnetic wave CT(b)
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Stratigraphic diagram of the study area
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Electromagnetic wave energy curve diagram at different operating frequencies
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Location map of the drilling
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The contour map of attenuation coefficient distribution among F5-F4-E4-D4-D5-E5-F5 boreholes(a) and Interpretation result diagram(b)
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The contour map of attenuation coefficient distribution among P11-Q11-Q12 boreholes(a) and Interpretation result diagram(b)
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The contour map of attenuation coefficient distribution among D15-D14-C14 boreholes(a) and Interpretation result diagram(b)
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| 钻孔 | CT显示异常区深度 | 钻探掉钻深度 | 重合范围 | 重合高度 | | F5 | 47.0~51.0 | 47.0~52.0 | 47.0~51.0 | 4 | | F4 | 46.5~49.0 | 45.5~49.5 | 46.5~49.0 | 2.5 | | E4 | 48.0~49.0 | 48.0~51.0 | 48.0~49.0 | 1 | | D4 | 46.5~50.0 | 45.5~48.5 | 46.5~48.5 | 2 | | D5 | 48.0~51.0 | 48.0~52.0 | 48.0~51.0 | 3 | | E5 | 49.0~51.0 | 50.0~54.0 | 50.0~51.0 | 1 | | P11 | 59.0~60.0 | 59.5~63.0 | 59.5~60.0 | 0.5 | | Q11 | 56.5~60.0 | 54.0~58.5 | 56.5~58.5 | 2 | | Q12 | 56.5~60.0 | 58.0~60.0 | 58.0~60.0 | 2 | | D15 | 53.0~58.0 | 54.0~62.0 | 54.0~58.0 | 4 | | D14 | 48.0~54.0 | 49.0~54.0 | 49.0~54.0 | 5 | | C14 | 51.0~56.0 | 52.0~60.0 | 52.0~56.0 | 2 |
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Comparison table of electromagnetic wave CT abnormal area and borehole datam
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