Steady And Non-steady Seepage Analysis In Rock Fracture Networks

For the seepage flow through rock fracture network, the cubic law in the single fracture conceptualized as a smooth and parallel plate and the continuity equation also was established. During the analysis of steady and unsteady seepage flow in the fracture networks, Darcy’s law was extended to dry domain above the free surface and specifying a Signorini’s type of boundary condition on the potential seepage boundaries, a new initial-boundary value problem of entire domain is deduced from non-steady seepage flow problems with free surface of in fractured rock masses, and the partial differential equation is proposed. The related finite element discretization and iterative algorithm of the partial differential formulation are detailed in which a continuous penalty function was introduced to guarantee the numerical stability. The validity of the numerical approach is then verified by existing laboratory tests and theoretical solution. Simultaneously, as some applications to the steady and non-steady seepage flow analysis in rock slope including complex fracture networks, the calculation results well illustrate the variations of groundwater flow, characteristics of seepage flow movement in fracture networks and inhomogeneity of flow distribution at seepage surfaces.This paper mainly studies on the following aspects:one is based on Darcy’s law, derived the single fracture almost as smooth parallel plate flow equation is cubic law; further through the micro body model, unsteady seepage control equation of crack stability-derived. Two is for the fracture network steady-unsteady seepage method using the generalized Darcy’s law, through the establishment of systemsteady-unsteadyseepage partialdifferential equation formulation, establishin g finite element numerical equations and iterative algorithm, not onlysolve the convergence problem of complex fracture networks, but also solve the singularity problem of the overflow. Three is the paper prepared by the process of the whole solution of unsteady seepage in fractured network stability-method using VC++, and then gives a number of examples, the example results well reflect thechange law of slope seepage field, and can accurately describe the fracture network seepage character of movement and flow maldistribution.