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Development of a Deep-Penetrating Borehole Geophysical Technique for Predicting Hazards Ahead of Coal Mining

机译:深孔钻孔地球物理技术在煤矿开采前的预测中的应用

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A field operable, breadboard model, borehole radar was developed to detect hazardous geological anomalies in and above a coal seam in advance of mining. A 4-inch-diameter downhole probe was fabricated and tested in several environments. The radar transmitter was also employed in a cross-hole or through-transmission mode to determine natural geotechnical and manufactured conditions between boreholes. Sensitivity to underground conditions in both modes of operation were indicated.

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