Constitutive and numerical modeling of clay subjected to cyclic loading
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Seidalinov, Gaziz
issued: 2018-04-23T15:37:05Z
issued: 2018
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Natural clays are anisotropic in their in-situ state and have an undisturbed shear strength in excess of the remoulded strength. In addition, most of the structures founded on clay deposits must be designed to withstand cyclic loads such as seismic ground motions or ocean waves. When subjected to earthquake or wind induced cyclic loadings, clay exhibits a complex response. A realistic modeling of clay response under irregular cyclic loading requires an appropriate stress--strain relationship described by a constitutive model. This thesis extends the formulation of an existing constitutive model, namely Simple ANIsotropic CLAY plasticity (SANICLAY) model, by incorporation of a, well-established in geomechanics, bounding surface formulation for successful simulations of clay response under cyclic loading. The most important aspects of the proposed formulation are the position of a projection center and the ability to capture continuous stiffness degradation. The proposed projection center is established in the instant of any stress reversal, and it realistically reflects the experimentally observed plastic strains. A damage parameter is also adopted to better simulate the continuous stiffness reduction during the course of applied cyclic loading. The proposed model is developed with the aim of maintaining the simplicity, and yet including an adequate level of sophistication for successful modeling of the key features of clay response. The model formulation is presented in detail, followed by details of its implementation for applications in boundary value problems. Verification of the model implementation and validation of its performance are also presented. Verification of the model implementation is required in order to build confidence prior to its validation. Followed model validation demonstrates the capabilities of the model in capturing a number of important characteristic features of clay response in cyclic loading. Further exploration of model response in mul…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/65581
note: Xon“titutivz vny cumzrixvl boyzling of Xlvyhuwjzxtzy to Xyxlix aovyingbyGaziz SeidalinovM.A.Sc., The University of British Columbia, 2012A THESIS SUBMITTED IN PARTIAL FULFILLMENT OFTHE REQUIREMENTS FOR THE DEGREE OFDOCTOR OF PHILOSOPHYinThe Faculty of Graduate and Postdoctoral Studies(Civil Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Vancouver)April 2018c© Gaziz Seidalinov 2018Vw“trvxtNatural clays are anisotropic in their in-situ state and have an undisturbed shear strengthin excess of the remoulded strength. In addition, most of the structures founded on claydeposits must be designed to withstand cyclic loads such as seismic ground motions or oceanwaves. When subjected to earthquake or wind induced cyclic loadings, clay exhibits a com-plex response. A realistic modeling of clay response under irregular cyclic loading requires anappropriate stress–strain relationship described by a constitutive model. This thesis extendsthe formulation of an existing constitutive model, namely Simple ANIsotropic CLAY plastic-ity (SANICLAY) model, by incorporation of a, well-established in geomechanics, boundingsurface formulation for successful simulations of clay response under cyclic loading. Themost important aspects of the proposed formulation are the position of a projection centerand the ability to capture continuous stiffness degradation. The proposed projection centeris established in the instant of any stress reversal, and it realistically reflects the experi-mentally observed plastic strains. A damage parameter is also adopted to better simulatethe continuous stiffness reduction during the course of applied cyclic loading. The proposedmodel is developed with the aim of maintaining the simplicity, and yet including an adequatelevel of sophistication for successful modeling of the key features of clay response. The modelformulation is presented in detail, followed by details of its implementation for applicationsin boundary value problems. Verification of the model imple…
has type: Thesis/Dissertation
date issued: 2018-05
is shown at: 10.14288/1.0365970
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/65581