Geomechanics and Engineering

  • 제7권1호
  • /
  • Pages.105-131
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  • 2014
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Analyzing consolidation data to predict smear zone characteristics induced by vertical drain installation for soft soil improvement

  • Parsa-Pajouh, Ali (School of Civil and Environmental Engineering, University of Technology Sydney) ;
  • Fatahi, Behzad (School of Civil and Environmental Engineering, University of Technology Sydney) ;
  • Vincent, Philippe (Menard Bachy Pty Ltd.) ;
  • Khabbaz, Hadi (School of Civil and Environmental Engineering, University of Technology Sydney)
  • 투고 : 2013.12.18
  • 심사 : 2014.03.17
  • 발행 : 2014.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this paper, the effects of variability of smear zone characteristics induced by installation of prefabricated vertical drains on the preloading design are investigated employing analytical and numerical approaches. Conventional radial consolidation theory has been adopted to conduct analytical parametric studies considering variations of smear zone permeability and extent. FLAC 2D finite difference software has been employed to conduct the numerical simulations. The finite difference analyses have been verified using three case studies including two embankments and a large-scale laboratory consolidometer with a central geosynthetic vertical drain. A comprehensive numerical parametric study is conducted to investigate the influence of smear zone permeability and extent on the model predictions. Furthermore, the construction of the trial embankment is recommended as a reliable solution to estimate accurate smear zone properties and minimise the post construction settlement. A back-calculation procedure is employed to determine the minimum required waiting time after construction of the trial embankment to predict the smear zone characteristics precisely. Results of this study indicate that the accurate smear zone permeability and extent can be back-calculated when 30% degree of consolidation is obtained after construction of the trial embankment.

키워드

참고문헌

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