Estimation of Block Conductivity and Scale-Dependency on Groundwater Inflow Into a Tunnel in Fractured Rock

Chang, K. (Korea Electric Power Corporation) | Lee, E.-Y. (Korea Electric Power Corporation) | Kim, C.-L. (Korea Electric Power Corporation) | Park, J.-W. (Korea Electric Power Corporation) | Kwon, S. (Korea Atomic Energy Research Institute)


ABSTRACT : Reasonably good agreement was found between the distribution of conductivity estimated from simulated and actual packer tests. It was also found that the correlation between the block conductivity and conductivity estimates from the simulation of packer test was weak. The numerical experiment was carried out to investigate the scale-dependency of groundwater inflow into a tunnel by using discrete fracture network (DFN) and equivalent porous medium (EPM) approaches. For REV scale, the discrepancy of average groundwater influx between the two approaches was not significant regardless of the ratio of tunnel length to the length of model section. The groundwater influx estimated from DFN approach seemed not to be reasonable for below REV scale. And it was found that there was a large discrepancy of groundwater influx between DFN and EPM approaches for below REV scale.