Mine Water Inflow Calculation Method Applied in Arid and Semiarid Mining Area

摘要

With the development of coal resources in Shendong mining area, collapse occurs continuously in the overburden layers of seams, forming caving zone and water-conducting fracture zone. Therefore, the structure of aquifers, runoff and discharge conditions of groundwater have changed. Groundwater level has changed significantly. In the collapsed zone and areas with induced fractures and water-enriched loose layers, groundwater level has lowered continuously. Prediction of mine water inflow is the main basis of mine waterproof, drainage system designing, mine water prevention and control measures. It is influenced by hydrology, geology, precipitation, mining conditions and other comprehensive factors, belonging to a grey system. Grey system method aims to solve the incomplete information system. In the grey system theory, the most commonly used is the GM (1, 1) prediction model. By using differential fitting method, the grey system theory dynamically processes the discrete, stochastic time series of original data information by the cumulative add and subtract, precision correction if necessary, in order to find the regularity from chaotic in the original data. The grey theory model is put forward to solve the traditional modeling method that cannot process the uncertain system of mine water inflow comprehensively and continuously.