NONLINEAR FINITE ELEMENT ANALYSIS OF CONSOLIDATION FOR VERTICAL DRAINED GROUND WITH PARAMETERS DETERMINED FROM GDS CONSOLIDATION PERMEABILITY TESTS
DENG Yuebao1，XIE Kanghe2，LI Feifei2，LIU Ganbin1
(1. Institute of Geotechnical Engineering，Ningbo University，Ningbo，Zhejiang 315211，China； 2. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：A series of widely accepted non-linear constitutive models，which can be fully gained from the conjoined consolidation permeability test by GDS advanced consolidation testing system，are firstly introduced. These models contain the piecewise linear e-lgp model，the linear e-lgk model and Hansbos non-Darcy flow model，where e is the porosity，p is the loading pressure and k is the permeability. Then，the parameters acquisition process for these models is recommended with the presentation of conjoined consolidation permeability test for Ningbo soft soil by GDS. Next，the finite element equations considered these nonlinear models are deduced based on the classical Biots consolidation theory. The corresponding computing program is presented in detail. The reliability of the program and its theoretical basis is verified through the comparison with an existing numerical method. Lastly，example analysis for vertical drained ground with layered soft soil is carried out and the influences of the permeable boundary，non-Darcy flow，smear effect and loading size on consolidation are studied. It is found that the influence of the permeable boundary is obvious，while the influences of non-Darcy flow and smear effect are not obvious. The influence of loading size is more complicated，which will accelerate or slow down the consolidation rate.
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2014, Vol. 33 
