Constitutive modelling and finite element analysis in geomechanics

 

Show simple item record

dc.contributor.advisor Martin, J B en_ZA
dc.contributor.author Resende, Luís Nuno da Costa en_ZA
dc.date.accessioned 2016-08-11T09:46:30Z
dc.date.available 2016-08-11T09:46:30Z
dc.date.issued 1984 en_ZA
dc.identifier.citation Resende, L. 1984. Constitutive modelling and finite element analysis in geomechanics. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21170
dc.description Bibliography: pages 208-222. en_ZA
dc.description.abstract The major objective of the work presented in this thesis was the development of a constitutive model for hard rock at high pressure. The model should capture the important features of material behaviour and should be soundly based on mechanical principles; furthermore it should be simple enough to permit implementation and use in large general purpose finite element codes. As a preliminary exercise, a state-of-the-art plasticity cap model was developed in order to provide a basis for comparison with the new model. Existing cap models were shown to exhibit certain inconsistencies associated with the suppression of a regime of potentially unstable behaviour; these inconsistencies were identified and eliminated in. the formulation which is presented in this thesis. The new rock model was based on internal damage concepts. The model is isotropic, and internal damage is measured by a scalar damage parameter. The properties of the material degrade as the damag~ parameter increases, and an evolution law governs the rate at which damage occurs. The damage model was calibrated against experimental results for Bushveld Norite, which is a very hard, brittle rock. The general form of the model, however, is suitable for application to soil and concrete. Both the plasticity cap model and the damage model were implemented into the finite element code NOSTRUM (developed by the Applied Mechanics Research Unit at the University of Cape Town). Solutions of a series of boundary value problems, including typical mining excavation problems, are presented to illustrate and compare the models. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Civil Engineering en_ZA
dc.subject.other Geomechanics en_ZA
dc.title Constitutive modelling and finite element analysis in geomechanics en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Civil Engineering en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Resende, L. N. d. C. (1984). <i>Constitutive modelling and finite element analysis in geomechanics</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/21170 en_ZA
dc.identifier.chicagocitation Resende, Luís Nuno da Costa. <i>"Constitutive modelling and finite element analysis in geomechanics."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1984. http://hdl.handle.net/11427/21170 en_ZA
dc.identifier.vancouvercitation Resende LNdC. Constitutive modelling and finite element analysis in geomechanics. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1984 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21170 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Resende, Luís Nuno da Costa AB - The major objective of the work presented in this thesis was the development of a constitutive model for hard rock at high pressure. The model should capture the important features of material behaviour and should be soundly based on mechanical principles; furthermore it should be simple enough to permit implementation and use in large general purpose finite element codes. As a preliminary exercise, a state-of-the-art plasticity cap model was developed in order to provide a basis for comparison with the new model. Existing cap models were shown to exhibit certain inconsistencies associated with the suppression of a regime of potentially unstable behaviour; these inconsistencies were identified and eliminated in. the formulation which is presented in this thesis. The new rock model was based on internal damage concepts. The model is isotropic, and internal damage is measured by a scalar damage parameter. The properties of the material degrade as the damag~ parameter increases, and an evolution law governs the rate at which damage occurs. The damage model was calibrated against experimental results for Bushveld Norite, which is a very hard, brittle rock. The general form of the model, however, is suitable for application to soil and concrete. Both the plasticity cap model and the damage model were implemented into the finite element code NOSTRUM (developed by the Applied Mechanics Research Unit at the University of Cape Town). Solutions of a series of boundary value problems, including typical mining excavation problems, are presented to illustrate and compare the models. DA - 1984 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1984 T1 - Constitutive modelling and finite element analysis in geomechanics TI - Constitutive modelling and finite element analysis in geomechanics UR - http://hdl.handle.net/11427/21170 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record