Application of in-seam wave seismic technology in geological structure detection of Datong coalfield
The coal seam of Datong coalfield is an extra-thick coal seam with complex geological conditions.We summarize the application of in-seam wave seismic technology in Datong coalfield in recent years,and the geological laws and detection effects of in-seam wave seismic method of the second and third mining areas of the coal mines in the northeast of Datong Coalfield.The results show:The average thickness of 3～5 coal seams in northeastern Datong Coalfield is about 15 m,be-longing to extremely thick coal seam.The main geological structures are small faults,coal thickness variation and many lay-ers of dirt band.Local area is affected by igneous intrusion.In-seam wave development in Datong coalfield is medium to good.In the development position of dirt band and igneous rock,in-seam wave development is relatively general,and the in-seam wave Airy phase velocity is about 1 000 m/s with a little difference in velocity between different working faces.The re-sults of in-seam wave interpretation of geophysical exploration in Datong coalfield are mainly fault,coal seam thinning and coal thickness change,coal seam crushing area and dirt band-affected area,and locally affected by igneous rock intrusion and anticlinal axis.Among them,most of the presumed faults have small drop,and no collapse column with short axis diame-ter greater than 20 m is found.It is proved by geological data that the in-seam wave technology is suitable for geological structure exploration in Datong coalfield.The results of in-seam wave interpretation can provide reliable geological guarantee for the safe production of mine.
in-seam wave technologyDatong coalfieldgeological structurein-seam wave development characte-risticsnumerical simulation
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