Assessment Of Transmissibility And Aquosity Of F25 Fault As Well As Measure Of Prevention In Zouzhuang Coal Mine

According to primary mineable coal bed in the 87 mining area of zouzhuang mine field docking with Taiyuan limestone and F25 fault cutting Taiyuan limestone and Ordovician Limestone of coal seam floor, this paper explore and analyze the transmissibility and aquosity of F25 fault, the water abundance of Taiyuan limestone in the upper side of fault, the hydraulic connection of aquifers and other hydrogeology conditions by means of borehole data?pumping test and injection test. This paper also analyze and research the mining effect of fault in the process of coal seam recovery, meanwhile, based on the mining effect of fault and theoretical formulae, obtain the rational width of protective coal pillar of fault avoiding fault activation.The main conclusions and understanding were as follows:(1) The water abundance of water contained in Cenozoic loose bed is weak, as well as coal measures sandstone aquifer and Taiyuan limestone aquifer in the upper side of fault, making less effect on coal seam recovery.(2) The transmissibility and aquosity of F25 fault is weaker and go against occuring hydraulic connection of aquifers.But because F25 fault cut Ordovician Limestone of coal seam floor and its water abundance is strong, so it is essential to analyze the possiblity of fault activation in the process of coal seam recovery.(3) According to the difference of engineering geology conditions,87 mining area was divieded into two blocks.Based on FLAC3D numerical simulation software, establish two typical engineering geological model of two blocks and simulate the mining effect of fault in the process of coal seam recovery respectively, obtaining the rational width of protective coal pillar of fault under critical condition of fault activation combined with theoretical formulae.Namely, setting 20m protective coal pillar of I block and II block is rational.