煤岩体孔隙裂隙双重介质逾渗机理研究

PERCOLATION MECHANISM OF FRACTURED COAL ROCKS AS DUAL-CONTINUA

介绍了孔隙裂隙双重介质逾渗概率的研究方法,在此基础上研究了煤岩体的逾渗概率与渗透系数的关系,分析了裂隙、孔隙及二者共同作用对煤岩体逾渗概率的影响。结果表明:煤岩体这类孔隙裂隙双重介质的逾渗概率与其渗透系数呈指数规律;煤岩体的裂纹孔隙率决定孔洞孔隙率对其渗透性的影响程度;同时,裂隙还决定了孔隙裂隙介质的逾渗规律,使其与多孔介质的逾渗规律具有完全不同的形式。

Coal rocks are a natural fractured porous media. The pores and fractures have great influence on permeability. This paper presents a new method for estimating percolation probability of the fractured coal rocks as dual-continua, and develops the relationships between percolation probability and permeability of coal rock samples for quantification of the influence of fractures and pores on coal rocks. The results indicate that the relation between the permeability and percolation probability of the coal rocks follows a power function. The results show that the fracture porosity determines the effects of the pore porosity on the samples and the fractures dominate the overall permeability of the fractured coal rocks, which is totally different from the results of conventional concept of porous media.