Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지

Modeling the Water-Block Interaction with Discontinuous Deformation Analysis Method

불연속 변형 해석법에 의한 지하수-암반블록 상호작용 모델링

  • 김용일 ((주)대우 건설기술연구소)
  • Published : 1999.06.01
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Abstract

A powerful numerical method that can be used for that purpose is the Discontinuous Deformation Analysis (DDA) method developed by Shi in 1988. In this method, rock masses are treated as systems of finite and deformable blocks. Large rock mass deformations and block movements are allowed. Although various extensions of the DDA method have been proposed in the literature, the method is not capable of modeling water-block interaction that is needed when modeling surface or underground excavation in fractured rock. This paper presents a new extension to the DDA method. The extension consists of hydro-mechanical coupling between rock blocks and water flow in fractures. A example of application of the DDA method with the new extension is presented. The results of the present study indicate that fracture flow could have a destabilizing effect on the tunnel stability.

불연속 변형 해석법(Discontinuous Deformation Analysis Method)은 1988년에 Shi에 의해 개발되었으며, 암반-구조물 상호작용 모델링에 매우 효율적인 해석법이다. 이 해석법에서 암반은 유한하고 변형가능한 블록으로 간주되며, 암반의 대변형 및 이동이 가능하다. 그 후, DDA 방법에 대한 여러가지 보완사례가 발표되었으나, 균열이 발달한 암반의 지표 또는 지중 굴착 모델링에 긴요한 지하수-암반블록 상호작용 모델링은 불가능하다. 본 논문에서는 암반 블록 사이의 수리 력학적 커플링을 고려하기 위한 새로운 방법이 제시된다. 또한, 이 방법이 보완된 새로운 DDA해석법의 적용 예가 제시된다. 본 연구결과 암반 균열 사이를 흐르는 지하수는 터널의 안정성에 나쁜 영향을 미친다는 사실이 확인되었다.

Keywords

References

  1. Int. J. Rock Mech. Min. Sci. & Geomech. Abs. v.32 Effects of turbulence on fracture flow and advective transport of solutes Amadei, B.;Carlier, J.F.;Illangasekare, T.H.
  2. Ph.D. thesis, University of Minnesota A numerical study of fluid flow in deformable, naturally fractured reserviors Asgian, M.I.
  3. Proceeding of $1^{st}$ International Congress on Rock Mechanics On the distrubution of stresses around circular tunnels in non-homogeneous rocks Goodman, R.E.
  4. Technical Report No. 5 Effects of joints on the strength of tunnels Goodman, R.E.
  5. Ph.D. thesis, University of Colorado at Boulder Influence of geology on seepage and uplift on concrete gravity dam foundations Grenoble, B.A.
  6. Proceedings of $1^{st}$ NARMS, UT Discontinuous deformation analysis and 'the artificial joint concept' Ke, T.C.;Goodman, R.E.
  7. Ph.D. thesis, Univ. of Colorado at Boulder Modeling the Effect of Water, Excavation Sequence and Reinforcement on the Response of Blocky Rock Masses Kim, Y.I.
  8. Ph.D. thesis, University of Colorado at Boulder Extensions to the discontinuous deformation analysis for jointed rock masses and other block systems Lin, C.T.
  9. Imperial College, Rock Mechanics Research Report No. 10 A study of groundwater flow in jointed rock and its influence on the stability of rock masses Louis, C.
  10. Proc. of the Second International Conference on Analysis of Discontinuous Deformation Ohnishi, Y.
  11. Proc. of the First International Forum on Discontinuous Deformation Analysis (DDA) and Simulations of Discontinuous Media Discontinuous deformation analysis (DDA) and simulations of discontinuous media Salami, M.R.;Banks, D.
  12. Ph.D. thesis, University of California Discontinuous deformation analysis: a new numerical model for the statics and dynamics of block systems Shi, G.H.
  13. International Journal for Numerical and Analytical Methods in Geomechanics v.13 Generalization of two-dimensional discontinuous deformation analysis for forward modeling Shi, G.H.;Goodman, R.E.
  14. Proceedings of International Conference of Rock Joints Forward and backward discontinuous deformation analyses of rock systems Shi, G.H.
  15. Crack problems in the classical theory of elasticity Sneddon, I.N.;Lowengrub, M.
  16. Proceedings of $1^{st}$ NARMS, UT Application of the discontinuous deformation analysis to the evaluation of rock reinforcement for tunnel stabilization Yeung, M.R.;Klein, S.J.