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http://dx.doi.org/10.9719/EEG.2016.49.1.31

Effect of Joint Orientation Distribution on Hydraulic Behavior of the 2-D DFN System  

Han, Jisu (Department of Energy Resources Engineering, Pukyong National University)
Um, Jeong-Gi (Department of Energy Resources Engineering, Pukyong National University)
Publication Information
Economic and Environmental Geology / v.49, no.1, 2016 , pp. 31-41 More about this Journal
Abstract
A program code was developed to calculate block hydraulic conductivity of the 2-D DFN(discrete fracture network) system based on equivalent pipe network, and implemented to examine the effect of joint orientation distribution on the hydraulic characteristics of fractured rock masses through numerical experiments. A rock block of size $32m{\times}32m$ was used to generate the DFN systems using two joint sets with fixed input parameters of joint frequency and gamma distributed joint size, and various normal distributed joint trend. DFN blocks of size $20m{\times}20m$ were selected from center of the $32m{\times}32m$ blocks to avoid boundary effect. Twelve fluid flow directions were chosen every $30^{\circ}$ starting at $0^{\circ}$. The directional block conductivity including the theoretical block conductivity, principal conductivity tensor and average block conductivity were estimated for generated 180 2-D DFN blocks. The effect of joint orientation distribution on block hydraulic conductivity and chance for the equivalent continuum behavior of the 2-D DFN system were found to increase with the decrease of mean intersection angle of the two joint sets. The effect of variability of joint orientation on block hydraulic conductivity could not be ignored for the DFN having low intersection angle between two joint sets.
Keywords
fractured rock mass; joint orientation distribution; discrete fracture network; block hydraulic conductivity; numerical analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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