한국지반공학회지:지반 (Geotechnical Engineering)

한국지반공학회 (Korean Geotechnical Society)
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성토재 아래의 연약지반에 설치된 연직배수재의 수치모델링

Numerical Modelling of Vertical Drains Installed in Soft Deposit under Embankment

  • 이승래 (정회원, 한국과학기술원 토목공학과) ;
  • 김윤태 (정회원, 한국과학기술원 토목공학과)
  • 발행 : 1996.12.01
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초록

배수재가 설치된 연약지반의 현장거동은 3차원적인 특성을 나타낸다. 그러므로 보다 효율적인 2차원 평면변형률 수치모델을 이용하여 적절하게 해석하기 위해서는 현장지반의 3차원적인 흐름특성을 평면변형률 모델의 층류흐름으로 전환할 필요성이 있다. 본 논문에서는 배수재가 설치된 연약지반의 3차원적인 거동특성을 고려하기 위하여 등가의 효과적인 모델방법이 유한요소법에 적용되었다. 2차원 등가모델은 등가투수계수와 배수재의 강성토를 고려한 등가폭을 가진다. 제안된 등가모델을 검증하기 위하여 ABAQUS 프로그램을 이용한 3차원 압밀해석을 수행하였으며, 3차원 해석결과와 2차원 해석결과를 비교하였다. 제안된 등가모델을 적용한 2차원 평면변형률 수치해석방법은 현장지반의 3차원적인 거동특성을 비교적 정확히 예측할 수 있다.

The in-situ consolidation behavior of drainage system-installed deposits has three dimensional characteristics. Therefore, for an approximate 2-D plane strain consolidation analysis, it is necessary to convert the 3-D spatial flow of actual cases into the laminar flow simulated by the 2-D plane strain model. . In this paper, in order to properly model the effect of three dimensional characteristics, an equivalent and efficient model has been applied in a finite element technique for the analysis of the drainage system-installed soil deposits. The equivalent two dimensional model involves equivalent permeabilities and drainage widths. To validate the equivalent two dimensional model, three dimensional analyses were per formed by using the ABAQUS program and the results of 3-D analyses were compared with those of the 2-D analyses. By using the proposed equivalent model, one may be able to appropriately predict the consolidation behavior of drainage system-installed soft deposits.

키워드

참고문헌

  1. ABAQUS USER'S MANUAL
  2. Trans. ASCE v.113 no.paper 2346 Consolidation of Fine-grained Soils by Drain Wells Barron, R.A.
  3. ⅩII ICSMFE Numerical Analysis of Embankment on Subsiding Ground Improved by Vertical Drains and Granular Piles Bergado, D.T.;Long, P.V.
  4. Canadian Geotechnical J. v.30 Some Techniques for Finite Element Analysis of Embankments on Soft Ground Chai, J.C.;Bergado, D.T.
  5. Computers and Geotechnics v.12 Some Remarks on Two and Three Dimensional Consolidation Analysis of Sand-drained Ground Cheung, Y.K.;Lee, P.K.K.;Xie, K.H.
  6. paper 12/22: Proc. 10th Int. Conf. Soil Mech. Found. Eng. v.3 Consolidation of Fined Grained Soils by Prefabricated Drains Hansbo, S.
  7. Canadian Geotechnical J. v.32 Modelling the Effect of Vertical Drains in Two-dimensional Finite Element Analysis of Embankments on Soft Ground Hird, C.C.;Pyrah, I.C.;Russell, D.;Cinicioglu, F.
  8. On the Generalized Stress-strain Behaviour of Wet Clay, Engineering Plasticity Roscoe, K.H.;Burland, J.B.
  9. Tsuchi-to-kiso, JSSMFE v.30 no.2 Consolidation Settlement and Lateral Displacement of Soft Ground Improved by Sand Drains Shinsha, H.;Hara, H.;Abe, T.;Tanaka
  10. Jap. Soc. Soil Mech. Found. Engrg. v.14 no.2 Consolidation of Soils by Vertical Drain Wells with Finite Permeability Yoshikuni, H.;Naganodo, H.