SIMULATION OF A TUNNEL BEHAVIOUR FROM DATA PROVIDED BY A RECONNAISSANCE GALLERY. PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON NUMERICAL METHODS IN GEOMECHANICS, 11-15 APRIL 1988, INNSBRUCK, AUSTRIA. VOLUMES 1 - 3

The objective of this study is to analyse the major characteristics of the ground surrounding a tunnel in order to aid tunnel design. In theory, the numerical methods applied to the study of underground structures allow the simulation of the behaviour of the tunnel surrounding material and supporting structures, and the calculation of stresses and strains. In practice however, a major difficulty often emerges when determining values to be selected for the distinctive parameters introduced in the model. In the example presented here, the parameter values are deduced from the analysis of convergence measurements performed in a reconnaissance gallery excavated in sandy clays. This analysis based on a viscoelastic model also allowed the assessment of the impact of the various parameters. As these values were determined with the assumption of a gallery with circular cross section, the passage to a gallery of any cross section requires a finite element calculation. This calculation, used with plane deformation, defines the short term behaviour, i.e. during excavation, taking account of the face progression and works steps (upper half-section, sidewalls, lower half-section). The calculation of delayed effects enables the assessment of the long term behaviour to be effected. In addition to a more accurate description of the ground, this process provides - based on the reconnaissance gallery - predominent data for the calculation of the final tunnel cross section, whatever its shape and excavation method may be. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/906191809X
• Corporate Authors:

  AA Balkema

  P.O. Box 1675
  Rotterdam,   Netherlands  BR-3000
• Authors:
  • DEFFAYET, M
  • Robert, A
• Publication Date: 1988

Media Info

• Features: References;
• Pagination: p. 1623-27
• Serial:
  • Publication of: Balkema (AA)
  • Publisher: AA Balkema

Subject/Index Terms

• TRT Terms: Calculation; Clay; Conferences; Deformation; Excavation; Mathematical models; Methodology; Sand; Simulation; Size; Stresses; Tunnels; Viscoelasticity
• ITRD Terms: 6464: Calculation; 4177: Clay; 8525: Conference; 5595: Deformation; 9014: Dimension; 5155: Excavation (process); 6473: Mathematical model; 9102: Method; 4105: Sand; 9103: Simulation; 5575: Stress (in material); 3374: Tunnel; 5935: Viscoelasticity
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00492687
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 90-6191-809-X
• Files: ITRD, TRIS
• Created Date: Mar 31 1990 12:00AM