Abstract:

In order to prospect geological conditions of two groups coal seam erosion zone of 12520 working face, according to the 12 coal seams conditions, proposed "step-exploration" programs with firstly prospect continuity and secondly prospect distribution regularity of erosion zone, used "branch-hole" and "wavy-line" combination of process, constructed directional drilling hole TC1# and 20 branches, prospected continuity and distribution regularity, and finally, analyzed exploration results from exploration accuracy and geological interpretation. Results show that the two groups erosion zone of 12520 working face is the same continuous erosion zone, and the thinnest coal seam is only 0.4m, seriously affecting coal mining operations, mining program should be adjusted according to 3m thick coal mining area traps.

Key words: erosion zone, directional drilling technology, MWD, branch hole, coal thickness contours