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https://hdl.handle.net/2142/66885
Description
Title
Modeling and Analysis of Cyclic Behavior of Sands
Author(s)
Momen, Hassan Mostafa
Issue Date
1980
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
Language
eng
Abstract
The main objective of this study is to develop a material model for sands based on the concepts of the theory of plasticity. The model could be used in finite element analysis of transient behavior of soil structure under dynamic loading. The model, to qualify as an acceptable constitutive law for cyclic behavior of sands, should be able to represent the following aspects of behavior: (a) Hysteretic energy dissipation; (b) Accumulated irreversible deformation; (c) Volumetric deformations.
The material model presented is a two surface model; a yield surface and a failure surface. The non-associated flow rule is employed. The potential function is chosen in such a way that only deviatoric plastic strains results from the flow rule. The volumetric strains are calculated using a semi-empirical method based on plastic work considerations.
Most of the parameters associated with the model are the conventional parameters used in the geotechnical field. These parameters are usually determined from standard triaxial tests or deduced from data furnished by such tests.
The validity of the model is verified by simulating some monotonic, cyclic triaxial tests, and shaking table tests. The effect of overconsolidation on the behavior of sand is discussed and a method to incorporate it in the model is presented.
The model is also used to simulate some undrained monotonic and cyclic triaxial tests where the pore pressure distribution is uniform. The effect of the membrane penetration on the pore pressure build up is formulated and included in the model.
The model is finally modified to include the effect of anisotropy on the behavior of sand.
The study has shown that the proposed model is capable of representing the important aspects of the behavior of sand outlined previously. It also has proven, via a numerous number of simulations of tests of different stress paths, that the parameters deduced from triaxial test data are indeed valid for other stress conditions.
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