The Offset Layout Study Of Close Distance Coal Seam Group Mining Face

Our country is rich in coal resources of a big country, coal seam conditions are complicated, quite different geological conditions, mining technology varies. In the 21 st century, with coal market continues to heat up, increasing the degree of mechanization of mining and the production of mine production continues to increase, at present, the mining is mainly aimed at the buried deep and complicated mining conditions of the coal seam, which has a large proportion of near distance coal seam mining,near distance coal seam group mining with mining and the use of the way is more common, and in the mining process, upper coal seam mining of the original rock should stress resulted in disruption, resulting in floor stress re distribution, has a great influence on the lower seam mining,therefore, in view of the near distance coal seam mining, there are many needs to be improved, so the research on the mining of the coal seam group is an important aspect of the future development.In this paper, based on Shanxi Lingshi Huayuan Coal as an engineering background, the main use of theoretical research, numerical simulation method combines verification engineering practice to carry out research and analysis work. Results are as follows:(1) Drawing on upper and lower working pressure when domestic scholars proposed distance seam group with the wrong type from mining outside and internal pressure from the wrong type of arrangement theoretical calculation formula, combined with the actual situation Huayuan Coal, analyzed two from the wrong kinds of factors, but come Huayuan Coal # 9, # 10 coal seam with mining, upper and lower working pressure is arranged outside the minimum theoretical formula for the wrong distance 21.63 m, upper and lower working pressure type arranged from smallest theory wrong to 10.64 m.(2) For two kinds of wrong application of the arrangement from the preliminary summarized: the pressure from outside the wrong type arrangement applies to the case of the thickness of the inter-layer distance seam group between different coal seams, the roof is not good structural integrity, strata appear more significant coal mines. On the other hand, it is applicable to pressure from within the formula wrong layout, and favorable press from within the formula wrong layout having the same distance seam group mining conditions Pressure mining complex mining of coal production.(3) UDEC use numerical simulation software, ahead of arrangement for the upper and lower working distance between the seam thickness sandwich these two variables of different simulation model Face Pressure Showing situation, on the one hand analyzes the wrong size, thickness of the interlayer distance when different, Face mine pressure behavior law; but it is also on the front of the theoretical derivation for a simple verification.According to the results of the above, plus additional analysis of mining instance, to a certain extent, explains some of the problems with the distance seam group mining when, for the future of mining distance seam group with actual production to provide some reference value.