多空隙组合地质单元渗流理论分析与试验

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。

Theoretical analysis and experiment for the seepage of a combinational fractured-vuggy-porous geological media

Rock mass exists often with a combined fractured-vuggy-porous void in nature. This work focused primarily on the seepage behaviour of a combined fractured-vuggy-porous geological media. On the basis of brief analysis for the Darcy’s law applied to the porous media, the Poiseuille’s law suitable for the fracture flow and the Darcy-Weibach theory used in the pipe flow, this paper derived the equivalent seepage coefficient KE which could describe the seepage nature of different combinations of fractured-vuggy-porous voids in geological medium and analyze the main factors for different combinations. In addition, laboratory seepage tests were used for two combinations to validate the theoretical equations derived, and available porous brick was chosen to simulate the rock matrix during testing. Comparison of the values of KE obtained from testing and computing respectively shows that KE is in the same order of magnitude and the error is very small as well.