Hydrogeological Characteristics Of F 1 Fault, Jiangliyuan Iron

Complicated hydrogeological conditions in underground mining, ore deposits by water filling the fault path, water-filled hydraulic connection between the impact of water, mine water inflow often decisive influence on the size of the formation. This not only directly affects the design of mine drainage, but also affect the development and utilization of program development deposits; Thus, in this type of mining, ore-controlling faults conduct hydrogeological properties of the research on mine safety, mine are all rational development of resources of great significance.Pei County in Jiangsu Province for the contact metasomatic iron pear - hydrothermal iron deposit, ore bodies occur in the Ordovician carbonate rocks and the contact zone of diorite porphyry deposit is buried depth-200m ~-800m,mining was thickness of about 180m covered by Cenozoic alluvium, mine complex hydrogeological conditions.F1 fault deposits are divided into upper and lower parts of this study was on the F1 fault on the disk in the southern half of the upper deposit.Detailed understanding and analysis of mining areas in the existing geological,hydrogeological based on the results, through geophysical exploration, hydrogeological drilling to identify the fault in the mining area near F1 geometry of space; Use of drilling and mining to expose faults in the other holes, to group,group hole pumping test in a variety of combinations, combined with groundwater pumping during the isotope variation, to identify groups of different aquifers and different hydraulic connection between the human intervention Groundwater flow characteristics; Different parts of the fault by drilling cores taken from the cementation and mineral composition analysis to identify the hydrogeological characteristics of F1 fault with fault depth and the direction of change.The results show that:within the control of the exploration,F1 is a NNE trending and tensional normal fault,the fault near vertical (inclination 84.3â—‹), fault zone width of 1.13 m ~ 5.24m.F1 fault is a fault of Water,but overall water conductivity in general,better guide the shallow water conductivity coefficient of its 1.8m/d;Ground water of fault on both sides of the hydraulic link more closely,along the fault zone to form a relatively strong lead with water,but the effect on the formation of fault on both sides of the width of the range is limited to about 10m.Shallow fault zone within the fault breccia cemented by the clay minerals in deep strata within fault breccia cemented by a micritic calcite,shallow fault zone conductivity is better than the deep water.By the impermeable layer on the bottom of the Cenozoic,Mesozoic and Cenozoic aquifers little impact on the mine water inflow;due to overall fault conductivity is general,the fault effects of mine water inflow is not large:when conductivity coefficient of water in the entire fault zone at 1.8m/d considered,the mine water inflow is normal 4057m3/d,when conductivity coefficient of water in the entire fault zone at 0 considered, the mine water inflow is normal 3864m3/d.