PREDICTION AND IMPACT ON NEARBY STRUCTURES DURING DEEP EXCAVATION FOR THE SOUTHERN LINK ROAD CONSTRUCTION

Prediction and impact on nearby structures during excavation for the 400 m cut-and-cover tunnel of the Southern Link Road Construction in Stockholm is described in this paper. The complicated deep excavation was a challenge from a geotechnical point of view. The up to 15 m deep excavations, required for construction of the concrete tunnel, was carried out in 1997-2000 within anchored steel sheet pile walls, with 1-6 levels of inclined anchors (tie-back walls), mostly with steel cores at the bottom. In order to get a cost-effective and safe structure, and to predict the deformation during construction, a large number of calculations of expected deformations for different construction stages in the soil have been made. These calculations have been performed using the FEM-program PLAXIS. Predictions of deformation curves, with upper and lower limits for deformations in the retaining wall and forces in anchors and struts, have been generated. To follow up the deformation during the construction phase, an extensive control program was used for monitoring the settlements within the working area. The program was based on a risk analysis and through the "Observation Method". Since the construction works were close to buildings and heavy traffic, the settlements in the neighborhood had to be small. This had a strong influence on the design and the construction methods. The control system consists of an automatic monitoring system for deformation measuring and anchor pressure measuring. Anchor forces, deformations in sheet piling wall, and settlements were compared to expected values as well as to the upper and lower limit values. Exceeding of a limit value automatically results in an alarm. Appropriate measures were made to control the deformation scenario.

• 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:
  • Hintze, S
• 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; Photos; References;
• Pagination: p. 129-134

Subject/Index Terms

• TRT Terms: Computer programs; Cut and cover tunneling; Deformation; Excavation; Finite element method; Geotechnical engineering; Monitoring; Risk analysis; Road construction; Settlement (Structures); Sheet pile walls; Soils; Tiebacks; Urban areas
• Uncontrolled Terms: Observational method
• Geographic Terms: Stockholm (Sweden)
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00930473
• Record Type: Publication
• ISBN: 3000091696
• Files: TRIS
• Created Date: Sep 3 2002 12:00AM