Study On The Distribution Rule Of The Parameters Of The Lowermost Aquifers At Kouzidong Coalfield

Kouzidong coalfield is a completely concealed one covered with a very large and thick Cenozoic unconsolidated sediment whose thickness amount to about 600 meters, and several aquifers are contained in this large and thick unconsolidated layer. These aquifers are anisotropic and asymmetric in terms of thickness, lithology and hydro-geological parameters. The water abundance state of the underlying aquifers determines the types and thickness of waterproof coal pillars to be designed in the near future. Firstly, a geo-mechanics test is introduced in this article to obtain the data of the borehole granularity composition and the well-logging curves. Through multivariable approach, the whole coalfield state is predicted in respect of granularity. Secondly, the hydro-geological parameters such as water conduction coefficient and average water penetrability coefficient are achieved using drill-hole data, experimental results and the experiential formulas that were made in Banji Mine. Thirdly, the plane distributions of parameters (bedrock elevation, aquifer thickness, water conduction coefficient, and water penetrability coefficient, etc.) are displayed through statistical random analysis. And finally, compared with a pumping test, the effect of con coal mining is appraised by analyzing synthetically the distribution of coal outcrop, coalfield tectonics and water abundance degree. At the end of this article, a proposal about the design of waterproof coal pillars is also put forward.