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http://dx.doi.org/10.9720/kseg.2022.1.059

Estimation of Mechanical Representative Elementary Volume and Deformability for Cretaceous Granitic Rock Mass: A Case Study of the Gyeongsang Basin, Korea  

Um, Jeong-Gi (Department of Energy and Resources Engineering, Pukyong National University)
Ryu, Seongjin (Facilities Department, Busan Transportation Corporation)
Publication Information
The Journal of Engineering Geology / v.32, no.1, 2022 , pp. 59-72 More about this Journal
Abstract
This study employed a 3-D numerical analysis based on the distinct element method to estimate the strength and deformability of a Cretaceous biotite granitic rock mass at Gijang, Busan, Korea. A workflow was proposed to evaluate the scale effect and the representative elementary volume (REV) of mechanical properties for fractured rock masses. Directional strength and deformability parameters such as block strength, deformation modulus, shear modulus, and bulk modulus were estimated for a discrete fracture network (DFN) in a cubic block the size of the REV. The size of the mechanical REV for fractured rock masses in the study area was determined to be a 15 m cube. The mean block strength and mean deformation modulus of the DFN cube block were found to be 52.8% and 57.7% of the intact rock's strength and Young's modulus, respectively. A constitutive model was derived for the study area that describes the linear-elastic and orthotropic mechanical behavior of the rock mass. The model is expected to help evaluate the stability of tunnels and underground spaces through equivalent continuum analysis.
Keywords
fractured rock mass; discrete fracture network; deformability; 3-D distinct element method; constitutive model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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