| Huangtaolegai mine area is located on southeast of the city of Ordos.Belonging to desert-semidesert region,its ground surface is covered by the Aeolian sand of Quaternary.With the semi-arid temperate continental monsoon climate,precipitation is very little,evaporation is strong,and no perennial river exists.From old to new,the stratum are:Yanchang formation of the upper Triassic,Yanan formation of the middle and lower Jurassic,Zhiluo and Anding formation of the middle Jurassic,Zhidan group of the Lower Cretaceous,and Quaternary.Among them,Yanan formation is coal-bearing strata,including 5 coal layers.Regional structure is simple,and there is no major fold and fault.Aquifers in this area were divided into three types,and their total number wsa 10.Among them,there were a loose rock pore unconfined aquifer layer,a clastic rock pore-confined water aquifer layer,8 clastic rock fracture-confined aquifers,and 8 relatively aquifuger.Deposits were directly filled water by the confined aquifer of Yanan formation having weak water abundance.And their main storage space was fracture following by pore.So they were pore-fracture filled deposits.Hydrogeological boundary and geological structure in this area were both simple.So deposits were mainly fracture water filled,and had a middle level hydrogeological conditions.Water sources filling the deposits in the study area were lateral runoff supply from confined aquifer on the outside area,leaky supply from parts of overlying aquifei,and underground water from sandstone’s pore and fracture as the roof of main coal seam.The main filling water channel was the caving zone formed during the coal mining,and middle level hydrogeological conditions.Big well method and analgy method of hydrogeology were respectively used to predict water inflow of coal mine under mining condition.And predicted maximum water inflow was 36067.9 m3/d and 44764.18 m3/d which were relatively close.So it had guiding reference value for mining design and production planning. |
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