FINITE ELEMENT ANALYSIS OF DEEP EXCAVATION PROBLEMS

The finite element method is a powerful tool for the analysis of deep excavation problems. Since soil is a highly nonlinear, plastic and porewater pressure dependent material, to realistically predict the deformation of soil, rational formulation of constitutive models and flow rules are necessary. This paper presents the commonly used constitutive soil models suitable for the analysis of deep excavation problems where the input parameters can be derived from the basic soil properties in the effective stress drained and undrained analyses. Moreover, the total stress undrained analysis was an alternative for the undrained clay where the stiffness of the undrained clay has to be obtained from empirical formulae. The finite element method can also be used for the analysis of stability problems. With the inclusion of elastic-plastic properties of structure members in the analysis and simulation of center posts in excavations, the finite element analysis can result in good estimate the factor of safety of excavations. Finally the three dimensional finite element analysis of excavations with buttress walls was presented to demonstrate its applicability. It is found that the wall deflection and ground settlement for excavations with buttress walls can be well predicted. The mechanism of buttress walls in reducing the lateral wall deflection can also be understood. Design of buttress walls in excavations would be more reasonable.

並列關鍵字

Effective stress undrained analysis ； total stress undrained analysis, stress paths ； deformation analysis, stability analysis ； three dimensional analysis

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