Analysis of A Braced Excavation In Soft Soils Considering The Consolidation Effect |
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Authors: | Pedro Alves Costa José Leitão Borges Manuel Matos Fernandes |
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Institution: | (1) Department of Civil Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal |
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Abstract: | The studies of excavations in soft clayey soils are normally based on undrained total stress analyses. A better approach consists
of taking into account the effects of consolidation during the excavation-bracing process and after the completion of the
construction by means of coupled finite element analyses in effective stresses. In this paper, the geotechnical behaviour
of a braced excavation in the soft soils of San Francisco (USA) is analysed, both during and after the construction period.
Numerical analyses are performed with a finite element program, which incorporates the Biot consolidation theory (coupled
formulation of the water flow and equilibrium equations) and soil constitutive relations simulated by the p-q-θ critical state model. Numerical results are compared with field results. |
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Keywords: | Braced excavation Soft soil Consolidation Coupled numerical analysis Case history |
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