Finite Element Analysis of Nonlinear Consolidation
Kim, Kwang Jin
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https://hdl.handle.net/2142/69916
Description
Title
Finite Element Analysis of Nonlinear Consolidation
Author(s)
Kim, Kwang Jin
Issue Date
1982
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
A general finite element method of solving nonlinear consolidation is presented for the unified treatment of saturated and partially saturated soils. Two sources of nonlinear material behavior are identified. The nonlinear material behavior under fully drained condition is represented by an elasto-plastic material model formulated in terms of effective stresses. For partially saturated soils, a constitutive model is presented for representing the compressibility of air-water mixture. The important role of surface tension between pore air and pore water is demonstrated. Surface tension effects are included in the proposed formulation in the form of a constant pressure difference between the pore air and pore water. A method of determination of this pressure difference from laboratory experiments is presented. The proposed compressibility equation of air-water mixture shows stable monotonic decrease with the increasing applied pressure.
The nonlinear consolidation finite element analysis is applied to the construction pore pressure problem using the general sequential construction and excavation method. This combined nonlinear consolidation model allows the influence of surface tension and the degree of saturation to be specified as input parameters in simulation of construction consolidation problems by virtue of the proposed equation of fluid compressibility. Results from the proposed model show considerably lower pore pressure development during the construction of earth dams in the partially saturated soils compared to fully saturated soils. Finally, a case simulation of Quebradona Dam using the proposed model is made and verified by comparing with the field measurements observed during the construction of the dam and appears to give reasonably accurate results.
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