3D AND 2D MODEL TESTS AND NUMERICAL ANALYSES OF SETTLEMENTS AND EARTH PRESSURES DUE TO TUNNEL EXCAVATION

Three-dimensional (3D) and two-dimensional (2D) model tests of tunnel excavation problems with two different depths were carried out to confirm the analytical results obtained previously. 3D and 2D elastoplastic finite element analyses corresponding to the model tests were also performed. The model test results were compared with the results obtained from numerical analyses. Through comparison supported by the model tests and numerical analyses, it was determined that a clay foundation results in a large surface settlement and a much wider surface settlement curve than a sand foundation with the same displacement. It is also shown that the settlements are different whether or not the construction procedure is taken into account (3D or 2D) even if the displacements imposed are the same at the end of excavation. In addition, the earth pressures were predicted through numerical analyses. It was concluded that the distribution of earth pressures in the sandy subsoil near the bottom of lowering basement is influenced considerably by the smoothness of basement, dilatancy characteristic and the magnitude of the prescribed displacement. (A)

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  • Corporate Authors:

    JAPANESE GEOTECHNICAL SOCIETY

    SUGAYAMA BUILDING 4F, CHIYODA-KU
    TOKYO,   Japan  101
  • Authors:
    • NAKAI, T
    • Xu, Liangjie
    • Yamazaki, H
  • Publication Date: 1997-9

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 31-42
  • Serial:
    • SOILS AND FOUNDATIONS
    • Volume: 37
    • Issue Number: 3
    • Publisher: JAPANESE GEOTECHNICAL SOCIETY
    • ISSN: 0038-0806

Subject/Index Terms

Filing Info

  • Accession Number: 00767253
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 6 1999 12:00AM