EFFECTS OF MODELING SOIL NONLINEARITY AND WALL INSTALLATION ON BACK-ANALYSIS OF DEEP EXCAVATION IN STIFF CLAY

The application of two relatively simple models is described: a linear elastic-perfectly plastic Mohr-Coulomb and a nonlinear "brick" model. The models simulate the top-down construction of a multipropped excavation in the overconsolidated stiff fissured Gault clay at Lion Yard, Cambridge, with and without wall installation effects modeled. Comparisons are made to evaluate the numerical results from the comprehensive case record at Lion Yard. The objectives are to illustrate, through comparisons, the effects of modeling wall installation and soil nonlinearity inside the yield surface on geotechnical designs. These comparisons focus on bending moments and deflections of the diaphragm wall, the strut loads, and the ground movements around the excavation. The results of the comparison demonstrate that the use of a Mohr-Coulomb model with a "wished-in-place" wall can reasonably estimate the maximum bending moments and deflections of the wall for design purposes once the input soil parameters are correctly established. The same model, however, overestimates strut loads and fails to predict the general ground deformation pattern.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339410
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Ng, CWW
  • LINGS, M L
• Publication Date: 1995-10

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 687-695
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 121
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Alternatives analysis; Bending moments; Clay soils; Deflection; Estimating; Estimation theory; Excavation; Excavations; Installation; Loads; Nonlinear systems; Seismicity; Simulation; Walls
• Uncontrolled Terms: Loading; Nonlinearity; Parameters
• Old TRIS Terms: Models-simulation
• Subject Areas: Geotechnology; Highways; Maintenance and Preservation; I42: Soil Mechanics;

Filing Info

• Accession Number: 00711629
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 30 1995 12:00AM