경상분지 백악기 화강암 암반에 대한 역학적 REV 및 변형특성 추정사례 = Estimation of Mechanical Representative Elementary Volume and Deformability for Cretaceous Granitic Rock Mass: A Case Study of the Gyeongsang Basin, Korea

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 최재영 ; 권현호 ; 엄정기 ; 심연식, "일광광산의 절리분포 특성과 광산배수 산성도의 관계" 대한지질공학회 20 (20): 425-436, 2010

2 류성진 ; 엄정기, "삼차원 절리텐서 파라미터가 절리성 암반의 변형특성에 미치는 영향" 한국암반공학회 31 (31): 66-81, 2021

3 노영환 ; 엄정기, "불연속면 연결구조의 삼차원 가시화 기법에 관한 연구" 대한지질공학회 22 (22): 449-458, 2013

4 류성진 ; 엄정기 ; 박진용, "개별요소법을 이용한 삼차원 DFN 시스템의 강도 및 변형계수 추정" 한국암반공학회 30 (30): 15-28, 2020

5 Kulatilake, P. H. S. W., "Use of the distinct element method to perform stress analysis in rock with non-persistent joints to study the effect of joint geometry parameters on the strength and deformability of rock masses" 25 : 253-274, 1992

6 Heuze, F. E., "Scale effects in the determination of rock mass strength and deformability" 12 : 167-192, 1980

7 Son, C. M., "Geological map of Dongrae and Weolnae sheets, 1:50,000" Korea Research Institute of Geoscience and Mineral Resources 1978

8 Cundall, P. A., "Formulation of a three-dimensional distinct element model - Part 1. A scheme to detect and represent contacts in a system composed of many polyhedral blocks" 25 : 107-116, 1988

9 Hart, R., "Formulation of a three dimensional distinct element model - Part II. Mechanical calculations for motion and interaction of a system composed of many polyhedral blocks" 25 : 117-125, 1988

10 Kulatilake, P. H. S. W., "Estimation of rock mass strength and deformability in 3-D for a 30 m cube at a depth of 458 m at Ӓspӧ Hard Rock Laboratory" 22 : 313-330, 2004

11 Kulatilake, P. H. S. W., "Estimating elastic constants and strength of discontinuous rock" 111 : 847-864, 1985

12 Priest, S. D., "Discontinuity analysis for rock engineering" Chapman & Hall 473-, 1993

13 Bieniawski, Z. T., "Determining rock mass deformability: Experience from case histories" 15 : 237-247, 1978

14 Lemos, J., "A generalized distinct element program for modeling jointed rock mass" 335-334, 1985

15 Cundall, P. A., "A computer model for simulating progressive, large-scale movements in blocky rock system" 2-8, 1971

16 Itasca, "3DEC (v.5.2) User’s guide"