Abstract
The article describes how current risk assessment of pressure mining using the “water inrush coefficient method” based on the Down Three Zones Theory is relatively inconsistent with the facts in practice. Based on the Down Three Zones Theory, the intact aquiclude is divided into a water pressure-free zone and a water pressure zone, and four kinds of mining discriminant models containing pressure are summarized by analyzing the influence of the confined groundwater on the intact aquiclude, according to the effect on its spatial characteristics. The relationship between the ratio of water head loss and permeability coefficient in the process of confined water conduction is obtained by building laboratory experiment model, and the height of water pressure zone is determined. The discriminant models are verified using the 81004 working face of the Caozhuang mine field in the Feicheng coalfield. The discriminant model results agree with the actual situation in the field and can be used to evaluate whether a coal seam can be safely mined.
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