预测矿坑突水量的广义三重空隙介质渗流模型

Generalized triple porosity media flow model for calculating mine karst-fracture water bursting discharge

为模拟岩溶裂隙含水层中水的运动和计算矿坑突水量,按空隙的规模以及对渗流的贡献,把岩溶裂隙划分为起主导渗流作用的宽大裂隙、起储水作用的中小裂隙和孔隙以及位于煤层底板起垂向突水通道作用的裂隙、钻孔等,建立了3种不同类型的渗流模型.对宽大裂隙中岩溶水的运动,按裂隙水三次方定律建立非连续裂隙网络渗流数学模型;对中小裂隙和孔隙建立连续介质渗透张量渗流数学模型;对突水通道则建立管道流方程,把它们耦合成主干裂隙-裂隙岩块-突水管道三重空隙介质渗流模型.将其应用于焦作演马煤矿岩溶水疏降流场模拟,能真实地刻画岩溶裂隙水运动的各向异性和不连续性特征.

In order to simulate the flow of water in karst fracture aquifers and calculate the water bursting discharge in coal mines,according 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 fracture networks at Yanma Coal Mine of Jiaozuo.The results show that the generalized triple porosity media flow model can describe the anisotropy and uncontinuity of the karst fracture water flow effectively and is a new method to calculate and forecast the water bursting discharge in karst fracture networks aquifer.