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岩体通常是以孔隙岩石为基质并包含各种成因的裂隙和溶隙的复杂多空隙组合地质材料。为研究孔隙-裂隙-溶隙多空隙组合介质的渗流特性,在简要介绍多孔介质渗流Darcy定律、平板窄缝流Poiseuille定律和圆形管道流Darcy-Weibach理论的基础上,分析了几种孔隙-裂隙-溶隙组合情况的多空隙介质渗流特性,推导出相应组合的等效渗透系数KE,给出了描述多空隙组合介质KE的一般表达式,讨论了影响各种空隙组合KE的主要因素。以普通砖模拟岩石基质,通过砖身钻孔填充及砖间缝隙填充,试验模拟了岩溶岩体和裂隙岩体中溶孔和裂隙填充后的渗透情况。试验结果与所推求理论公式计算出的KE在同一量级且误差很小,很好地验证了所推导的多空隙组合介质渗透系数表达式的有效性。
The rock mass is usually a complex multislice composite geological material that is composed of pore rocks and contains fractures and crevices of various origins. In order to study the seepage characteristics of porous-fractured media with multiple voids, the porous media seepage Darcy’s law, Poiseuille’s law of flat slits and Darcy-Weibach’s theory of circular pipe flow are briefly introduced. Fissile-sag combinations, the equivalent permeability coefficient KE of the corresponding combination is deduced, and the general expression of KE, which describes the multi-gap combination medium, is given. The main factors affecting the combination of various clearances KE are discussed. The rock matrix was simulated by ordinary brick, filled by brick body and filled with brick in the brick. The infiltration of the karst rock body and the fractured rock mass after the filling of fissures and fractures was simulated. The test results are in the same order of magnitude as the KE calculated by the theoretical formula proposed and the error is very small, which verifies the validity of the proposed expression for the permeability coefficient of multi-gap composite media.