Time-Dependent Behavior of Excavation in Cohesive Soils Using the Bounding Surface Model
Keywords:
consolidation, excavation, finite, elements, permeability, plasticityAbstract
The study was to investigate the behavior of excavation in cohesive soils using the bounding surface model. The model and the finite element formulation are described and verified. Then the ground movements were predicted around an excavation in several types of cohesive soils. The results of the analysis demonstrate the effects of the consolidation process and permeability on the stability of the excavation and that the displacements at excavation boundaries increase with increasing permeability and time but at a lower rate as the permeability value decreased. Also the study shows a significant influence of the critical
state parameters on the behavior of excavation in normally consolidated clay comparing with the surface configuration and hardening parameters of
the model. Thus the modified Cam-clay model which employs a lower number of parameters can be used for the problems of excavation in normally
consolidated clay
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