Prediction of water inflow into underground excavations in fractured rocks using a 3D discrete fracture network (DFN) model

摘要: Groundwater flow is a major issue in underground opening fractured rocks. Because of finding the fracture connectivity, contribution each flow, and connectivity to excavation boundary, prediction water excavations difficult. Simulation characteristics spatial distribution necessary obtain realistic estimation inflow quantity tunnel excavations. In this research, computer code for three-dimensional discrete network modeling into was developed. code, fractures are simulated as ellipsoid while geometrical properties reproduced using stochastic method. Properties such size, orientation, density modeled by their respective probability distributions, which obtained from field measurements. According condition, paths rock mass determined. The considered channels with rectangular sections channel width aperture determine geometry section. Inflow predicted ignoring matrix permeability considering hydrogeological conditions. To verify presented model, simulation results were compared part Cheshmeh-Roozieh transfer Iran. research good agreement data. Thus, average has just an approximation error equal 17.8%, its standard deviation 8.6 l/s, 21% observed value that demonstrates low dispersion values.