›› 2010, Vol. 31 ›› Issue (8): 2630-2636.

• Numerical Analysis • Previous Articles     Next Articles

Comparison of settlement prediction from back analysis with forward analysis for embankment on soft soil foundation based on large strain and visco-elastoplastic model

WEI Li-min, HE Qun, WANG Yong-he   

  1. School of Civil and Architectural Engineering, Central South University, Changsha 410075,China
  • Received:2008-11-11 Online:2010-08-10 Published:2010-08-30

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Abstract:

Taking the deformation characteristics of large displacement, large strain, permeability-consolidation and time-dependence of soft soil into account, the finite element method (FEM) formulas and iterative solution strategy were built, in which the soil skeleton was simulated by visco-elastic-plastic model. The embankment construction process was simulated by dynamic “birth” and “dead” elements and the double nonlinear permeability-consolidation analysis method was established. Then the FEM program LSVEP was developed. The foundation settlement was predicted by using parameters from laboratory tests and back analysis separately; and the results were compared with monitored data. The results indicate that: the large strain visco-elastoplastic FEM built in this paper is reasonable and the precision of settlement prediction was affected markedly by the choosing correctly of calculating parameters. The settlement predicted by parameters from back analysis is much more close to those monitored settlements, it is an effective method to improve the precision of settlement prediction and can be referenced by similar projects.

Key words: settlement prediction, large strain, visco-elastoplastic model, permeability-consolidation, back analysis

CLC Number: 

  • TU 447
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