In the construction of tunnel, exposed aquifer will result in the disaster of water inrush. Sometimes the flow of water inrush is larger, sometimes very small; sometimes large amounts of sediment rush into the tunnel, and sometimes the sediment inrush disaster doesn't occur. These different-phenomena are related to the permeability and thickness of aquifer, the distance between recharge source and water inrush point, and the external recharge etc. In this paper, one hydrogeology model of water inrush is constructed, in order to analyze the relations between the water head line, hydraulic gradient, water irruption and the relevant factors, and find out the general laws of water inrush disaster in exposed aquifer to achieve the purpose of preventing and controlling disaster.
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