URBAN TUNNELLING IN WATER BEARING GROUND - COMMON PROBLEMS AND SOIL-MECHANICAL ANALYSIS METHODS

Water can affect the stability and the deformations of a tunnel by reducing the effective stress and thus the resistance to shearing, and by generating seepage forces towards the excavation boundary. The seepage-flow may lead to a draw-down of the water-level and to time-dependent subsidence due to consolidation. Furthermore, when tunnelling in soft ground, the seepage forces acting towards the tunnel face may impair its stability. Soil mechanical calculations represent an important design-aid as they provide valuable indications regarding the ground response to the tunnelling operation. Depending on the specific question, a limit equilibrium analysis, a numerical seepage-flow analysis, a stress analysis or a coupled stress-seepage-flow analysis has to be carried out. The paper deals with the limitations, the range of applicability and the modelling assumptions of the various analysis types.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/3000091696
• Corporate Authors:

  Swiss Federal Institute of Technology Zurich

  Institute for Geotechnical Engineering
  Zurich,   Switzerland  8093
• Authors:
  • Anagnostou, G
• Conference:
  • Planning and Engineering for the Cities of Tomorrow. Second International Conference on Soil Structure Interaction in Urban Civil Engineering
  • Location: Zurich, Switzerland
  • Date: 2002-3-7 to 2002-3-8
• Publication Date: 2002

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 233-240

Subject/Index Terms

• TRT Terms: Design; Drawdown (Hydraulics); Effective stress; Groundwater; Mathematical analysis; Seepage; Shear strength; Soft soils; Soil mechanics; Stability (Mechanics); Subsidence (Geology); Tunneling; Urban areas
• Subject Areas: Bridges and other structures; Construction; Design; Geotechnology; Highways; Hydraulics and Hydrology; Public Transportation;

Filing Info

• Accession Number: 00930484
• Record Type: Publication
• ISBN: 3000091696
• Files: TRIS
• Created Date: Sep 5 2002 12:00AM