Applied research on groundwater flow simulation in fractured rock aquifers

In order to simulate the flow of water in rock aquifers and calculate the water bursting quantity in coal mines, according to their sizes and the function to water flow, the pores in aquifers are divided into three types, large fractures networks dominating flowing action, medium-small cracks and pores storing waters and cracks, drill holes located under coal floor which act as vertical passages for bursting water. Then three different kinds of water flow models are established. The discrete fracture networks flow model is for the water flow in large fractures by the cubic law of fractural waters. The continuous media permeability tensor flow model is for the medium-small fractures and pores. The tube flow model is for the passages of bursting waters. The couple of the three models forms a generalized triple porous media flow model, which has been applied to simulate the Karst water flow in karst networks at Yanma coal mine of Jiaozuo. The results show that the generalized triple and dual porosity media flow model can describe the anisotropy and uncontinuity of the karst water flow effectively and is a new method to calculate and forecast the water bursting quantity in karst networks aquifer.