一种裂隙-连续介质的耦合渗流计算方法

A Coupled Seepage Calculation Method for Fracture-Continuous Media

目前单独的孔隙介质(如土体)一般采用基于达西定律的连续介质渗流理论进行渗流分析,单独的裂隙介质(如岩体)多用基于立方定律的离散裂隙网络模型进行渗流分析。对于既有孔隙介质,又有裂隙介质的渗流区域,并没有形成一个整体的分析方法。针对裂隙岩基上修筑土石坝这种特殊渗流区域,对岩体裂隙区域和土体孔隙区域采取不同的渗流理论,通过交界区节点水头一致性条件,形成耦合整体渗透矩阵,建立了裂隙-连续介质耦合渗流计算方法,编制了裂隙-连续介质耦合渗流分析程序并进行了算例和工程验证,为裂隙与连续介质的耦合渗流计算提供了新的解决方法。

At present,the seepage analysis of porous media(such as soil)is generally based on Darcy's law,and fracture media(such as rock)often uses the discrete fracture network model which is based on cubic law to conduct the seepage analysis.For the seepage area having both porous media and fracture media,an overall analysis method still need to be developed.This paper applies the different seepage theories suited to the porous media and fracture media respectively for the special seepage area of rock-filled dam built on the fractured rock foundation.By the consistency condition of the junction head node,coupling integral penetration matrix is derived,and in this way the coupled fracture-continuous media seepage calculation method is developed.A coupled seepage analysis program for fracture-continuous medium is coded and verified by an example and engineering case.The study provides a new solution for the calculation of coupled seepage flow between fractures and continuous media.