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http://dx.doi.org/10.9720/kseg.2022.1.041

Estimation of 3-D Hydraulic Conductivity Tensor for a Cretaceous Granitic Rock Mass: A Case Study of the Gyeongsang Basin, Korea  

Um, Jeong-Gi (Department of Energy and Resources Engineering, Pukyong National University)
Lee, Dahye (Technology Standard Department, Korea Rural Community Corporation)
Publication Information
The Journal of Engineering Geology / v.32, no.1, 2022 , pp. 41-57 More about this Journal
Abstract
A workflow is presented to estimate the size of a representative elementary volume and 3-D hydraulic conductivity tensor based on fluid flow analysis for a discrete fracture network (DFN). A case study is considered for a Cretaceous granitic rock mass at Gijang in Busan, Korea. The intensity and size of joints were calibrated using the first invariant of the fracture tensor for the 2-D DFN of the study area. Effective hydraulic apertures were obtained by analyzing the results of field packer tests. The representative elementary volume of the 2-D DFN was determined to be 20 m square by investigating the variations in the directional hydraulic conductivity for blocks of different sizes. The directional hydraulic conductivities calculated from the 2-D DFN exhibited strong anisotropy related to the hydraulic behavior of the study area. The 3-D hydraulic conductivity tensor for the fractured rock mass of the study area was estimated from the directional block conductivities of the 2-D DFN blocks generated for various directions in 3-D. The orientations of the principal components of the 3-D hydraulic conductivity tensor were found to be identical to those of delineated joint sets in the study area.
Keywords
fractured rock mass; discrete fracture network; hydraulic conductivity tensor; fluid flow modeling; representative elementary volume;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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