Engineering Application Of Numerical Analysis Of Coupling Fluid Flow And Stress In Fractured Rock Masses

Coupling analysis research of seepage and stress in fractured rock masses is a very valued but complicated task for discussion. The cubic law which describe the law of fluid flow in fracture is based on parallel plate joint model, in this paper the cubic law is modified and non-parallel wedge-shaped joint fluid flow equation is formed, coupling relation between seepage and stress is given based on permeability and joint distortion as the linkage between two field, while the coupling mechanism is simple and explicit. In the paper each mathematic model of seepage in fractured rock masses is summarized. Finite Element Analysis simulation equations of non-double porosity system model-equivalent continuum media model and discrete fracture network model are given, furthermore a coupling uniform model is formed which integrated with the merit of the two former models. View the rock masses as equivalent continuum media characterized as anisotropic material, equivalent elastic matrix of equivalent continuum media model is formed based on strain adding theory, and then principal model is arrived, two dimension finite element equations are formed according to the Galerkin Finite Element Method which takes both displacement and fluid pressure as un-known variables. This model let uniform solved method come into effect, which avoids solving the problem by iteration of the two fields. And then corresponding finite element computed program is authorized. In the end of the paper underground pressure and fluid flow numerical simulation is done for ChenChao Iron Mine during top-collapse engineering at west part of the Mine, and then give the Mine some advices benefit to its safe production after analyzing the computed results.