AN APPROXIMATE ANALYSIS OF THE THREE-DIMENSIONAL EFFECTS OF DIAPHRAGM WALL INSTALLATION

The paper investigates the three-dimensional effects of diaphragm wall installation in stiff clays by an appropriate numerical analysis using two simplified plane section analyses. Horizontal displacements have been predicted using a horizontal plan analysis, incorporating bentonite and wet concrete stages. Average displacements from the first analysis have been fed into a second vertical section analysis as a boundary displacement, resulting in predicted average lateral stresses behind the wall. A diaphragm wall at Lion Yard, Cambridge, is used to illustrate this procedure. Stress changes are dominated by two distinct mechanisms: horizontal arching and downward load transfer. Horizontal arching results in stresses being redistributed laterally during the construction of successive wall panels, but does not result in significant overall stress reductions. In contrast, downward load transfer results in substantial stress reductions by shedding load downwards beneath the toe through the action of shear stresses in a vertical plane. Consequently, there is a substantial increase in lateral stress beneath the toe. Conclusions are drawn on the variables which affect displacements and average lateral stresses at the end of wall installation. Lateral stress distributions along a diaphragm wall at the end of installation will be non-uniform, and will vary with panel installation sequence. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • Ng, CWW
  • LINGS, M L
  • SIMPSON, B
  • NASH, DFT
• Publication Date: 1995-9

Language

• English

Media Info

• Features: References;
• Pagination: p. 497-507
• Serial:
  • GEOTECHNIQUE
  • Volume: 45
  • Issue Number: 3
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Approximation (Mathematics); Calculation; Clay; Installation; Loads; Mathematical analysis; Methodology; Motion; Slurry trenches; Soil mechanics; Stresses
• Geographic Terms: United Kingdom
• ITRD Terms: 6471: Analysis (math); 6442: Approximation; 6464: Calculation; 4177: Clay; 3840: Installation; 5567: Load; 9102: Method; 5483: Movement; 3358: Slurry trench wall; 5755: Soil mechanics; 5575: Stress (in material); 8119: United Kingdom
• Subject Areas: Geotechnology; Maintenance and Preservation;

Filing Info

• Accession Number: 00715840
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jan 31 1996 12:00AM