Numerical simulation of the influence of multi-seam mining on the height of water-conducting fracture zone in Serian No.2 Mine
The determination of the height of water-conducting fracture zone is of great significance to the prevention and control of water damage in coal mines and the efficient mining of coal.In order to study the development law of water-conduc-ting fracture zone in multi-coal seam mining,taking No.5 coal seam of Serian No.2 Mine as the research object,the influ-ence of excavation of No.3,4,and 5 coal seams on the development height of water-conducting fracture zone of overlaying rock in Serian No.2 Mine in sequence is studied by theoretical analysis and numerical simulation of UDEC software.The re-sults show that the height of the water-conducting fracture zone in coal seam 3,4 and 5 predicted by numerical simulation is 38 m,50 m and 70 m,respectively.Mining 4-1 top coal has a certain influence on 3-1 top coal conductivity,mining 5-1 top coal promotes 4-1 top coal conductivity to further increase,and the influence degree is large,while it has a small pro-motion effect on 3-1 top coal conductivity.The results provide theoretical and technical support for the safe and efficient min-ing of 5 coal seam in Serian No.2 Mine.
flood damage in the old skyselenite 2water conduction fracture zonemulti-seam mining
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