Details

Autor(en) / Beteiligte

• Peng, Shujun
• Zhang, Zhennan
• Li, Chunfang
• He, Guofu
• Miao, Guoqing

Titel

Simulation of water flow in fractured porous medium by using discretized virtual internal bond

Ist Teil von

• Journal of hydrology (Amsterdam), 2017-12, Vol.555, p.851-868

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Discretized virtual internal bond is employed to model fractured porous medium.•Unified parameter calibration is proposed regardless of detailed element geometry.•Massive fractures are accounted and aperture heterogeneity is considered.•Both the steady and the transient flow process can be well simulated.•This method is robust and applicable to any type of element. The discretized virtual internal bond (DVIB) is adopted to simulate the water flow in fractured porous medium. The intact porous medium is permeable because it contains numerous micro cracks and pores. These micro discontinuities construct a fluid channel network. The representative volume of this fluid channel network is modeled as a lattice bond cell with finite number of bonds in statistical sense. Each bond serves as a fluid channel. In fractured porous medium, many bond cells are cut by macro fractures. The conductivity of the fracture facet in a bond cell is taken over by the bonds parallel to the flow direction. The equivalent permeability and volumetric storage coefficient of a micro bond are calibrated based on the ideal bond cell conception, which makes it unnecessary to consider the detailed geometry of a specific element. Such parameter calibration method is flexible and applicable to any type of element. The accuracy check results suggest this method has a satisfying accuracy in both the steady and transient flow simulation. To simulate the massive fractures in rockmass, the bond cells intersected by fracture are assigned aperture values, which are assumed random numbers following a certain distribution law. By this method, any number of fractures can be implicitly incorporated into the background mesh, avoiding the setup of fracture element and mesh modification. The fracture aperture heterogeneity is well represented by this means. The simulation examples suggest that the present method is a feasible, simple and efficient approach to the numerical simulation of water flow in fractured porous medium.