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Stresses and strains on the common boundary surface and strength of composite rock masses acted by three-dimensional compressive stresses
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866188 Two- and three-surface models of plasticity Hashigushi. K Proc 5th International Conference on Numerical Methods in Geomechanics. Nagoya, 1-5 April 1985 VI. P285-292. P,~bl Rotterdam: .4..4. Balkema. 1985 Various constitutive models for the description of elastoplastic deformation with anisotropic hardening, and also a transition from the elastic to the distinct-yield (fully-plastic) state, have been proposed in the past. Among them the two-surface model, extended from the kinematic hardening model, is one of the most available models, and many constitutive equations have been presented using this model. They have not been formulated, however, in mathematically rational forms applicable to the generalized material with hardening or softening behaviour. A reasonable formulation of the two-surface model is given by deriving the mathematical condition which must be satisfied in order that the surfaces do not intersect at their relative translation, which will be called a "non-intersection condition', and by assuming a reasonable measure to describe the approaching degree to the distinct-yield state. Further. this model is extended to the three-surface model which enables description of the smooth elastic-plastic transition. Auth.
866189 Elasto-plastic constitutive equation of geologic materials with memory Oka, F; Adachi. T Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya. I-5 April 1985 VI. P293-300. P,thl Rotterdam." A. A. Balkema. 1985 Dense sands, overconsolidated clays and rock-like materials show strain-hardening and strain-softening bchaviour under certain ranges of confining pressure. To establish a constitutive model which can describe the strain-softening behaviour of the materials is one of the problems in the study field of constitutive laws for geotechnical materials. A constitutive model which is suitable for the purpose is proposed, which assumes the materials to be elasto-plastic continua with memory based on the concept of a generalized simple body. The constitutive model was examined using experimental results from a soft sedimentary rock (tuff), and the capability of the model to describe the behaviour of soft rocks was confirmed. Auth.
866190 Application of deformation model with no yield surface to various over-consolidated geologic materials Okamoto. T
866191 Asymmetric stress distribution around a slotted cylinder in a poroelastic medium Fahrenthold. E P: Cheatham. J B In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2. P947-956. PuN Rotterdam: .4 A. Balkema. 1985 Stresses and displacements around a well bore in a poroelastic medium are studied by application of the complex variable methods. Two dimensional analys,s is used to solve several uncoupled porous media problems under transient radial flow conditions. Stresses around open, fully supported and partially supported well bores are analysed. The case of the well bore supported by a liner with a single slot is considered as a two dimensional analogue to the perforated casing problem.
866192 Stresses and strains on the common boundary surface and strength of composite rock masses acted by three-dimensional compressive stresses Tan Xue Shu: Xian Xue Fu: CaoWei In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics. Rapid Cio,, 26-28 June 1985) V2. P993-997. Publ Rotterdam: A. A. Balkema. 1985 The boundary stresses and strains for composite rock masses under three dimensional compressive stress have been analysed to elucidate the failure mechanism and conditions. and determine the strength of the composite mass. Laboratory triax,al tests were carried out using composites of glu~xt mudstone and limestone. Theoretical and experimental results were in good agreement. 866193 Numerical modelling and geomechanics (soil-rock-concrete) Zienkiewicz. O C In: Mechanics o f Geomateriais: Rocks, Concrete, Soils (palu,r to the I U T A M William Prager Symposium, Et,anston, I1-15 Sept 1983) P471-499. Publ Chicheyter: John Wiley. t985 The first part is concerned with the basic mechanics and tbrmulation to describe geomaterials as two phase media. Developments of the Blot type formulation are described. Secondly, numerical solutions of the derived equations are considered. Thirdly, material models are examined, including the distributed cracking model to describe tensile failure and cracking, joint models, and models to describe the behaviour of geomaterials under static, cyclic or transient loads, or which account for rate effects and deterioration. Finally, some practical engineering problems are examined using the numericalfinite element solution. The importance of step-by-step nonlinear amdysis for the dynamic analysis of soil or concrete structures is demonstrated. 56 refs.
Rotterdam: A. A. Balkema. 1985
866194 Numerical models for dynamic loading Sandler. 1; Baron. M In: Mechanics o f Geomaterlals: Rocks, Concrete, Soils (paper to the I U T A M William Prager Symposium, Eeanston, ! i-15 Sept 1983) P501-526. Publ Chichester: John Wiley. 1985
A deformation model is proposed to express the deformation characteristics of overconsolidated geological materials. It is a simple elasto-plastic model with no yield surface and is based on an anisotropic hardening rule. Upon investigating the applicability of this model, it was found that it can be applied to various geologic materials.
An overview of some of the considerations involved in the construction of numerical models for dynamic loading for geological materials is presented, including simple and more detailed plasticity models and cap models, and brief descriptions of their behaviour are given. The role of laboratory and in situ experimental data in material modelling is examined.
Proc 5th International Conference on Numerical Methods in Geomeehanics. Nagoya, 1-5 April 1985 VI P301-308. Puhl
(" 1986 Pergamon Journals Ltd, Reproduction not permitted
866188 Two- and three-surface models of plasticity Hashigushi. K Proc 5th International Conference on Numerical Methods in Geomechanics. Nagoya, 1-5 April 1985 VI. P285-292. P,~bl Rotterdam: .4..4. Balkema. 1985 Various constitutive models for the description of elastoplastic deformation with anisotropic hardening, and also a transition from the elastic to the distinct-yield (fully-plastic) state, have been proposed in the past. Among them the two-surface model, extended from the kinematic hardening model, is one of the most available models, and many constitutive equations have been presented using this model. They have not been formulated, however, in mathematically rational forms applicable to the generalized material with hardening or softening behaviour. A reasonable formulation of the two-surface model is given by deriving the mathematical condition which must be satisfied in order that the surfaces do not intersect at their relative translation, which will be called a "non-intersection condition', and by assuming a reasonable measure to describe the approaching degree to the distinct-yield state. Further. this model is extended to the three-surface model which enables description of the smooth elastic-plastic transition. Auth.
866189 Elasto-plastic constitutive equation of geologic materials with memory Oka, F; Adachi. T Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya. I-5 April 1985 VI. P293-300. P,thl Rotterdam." A. A. Balkema. 1985 Dense sands, overconsolidated clays and rock-like materials show strain-hardening and strain-softening bchaviour under certain ranges of confining pressure. To establish a constitutive model which can describe the strain-softening behaviour of the materials is one of the problems in the study field of constitutive laws for geotechnical materials. A constitutive model which is suitable for the purpose is proposed, which assumes the materials to be elasto-plastic continua with memory based on the concept of a generalized simple body. The constitutive model was examined using experimental results from a soft sedimentary rock (tuff), and the capability of the model to describe the behaviour of soft rocks was confirmed. Auth.
866190 Application of deformation model with no yield surface to various over-consolidated geologic materials Okamoto. T
866191 Asymmetric stress distribution around a slotted cylinder in a poroelastic medium Fahrenthold. E P: Cheatham. J B In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) V2. P947-956. PuN Rotterdam: .4 A. Balkema. 1985 Stresses and displacements around a well bore in a poroelastic medium are studied by application of the complex variable methods. Two dimensional analys,s is used to solve several uncoupled porous media problems under transient radial flow conditions. Stresses around open, fully supported and partially supported well bores are analysed. The case of the well bore supported by a liner with a single slot is considered as a two dimensional analogue to the perforated casing problem.
866192 Stresses and strains on the common boundary surface and strength of composite rock masses acted by three-dimensional compressive stresses Tan Xue Shu: Xian Xue Fu: CaoWei In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics. Rapid Cio,, 26-28 June 1985) V2. P993-997. Publ Rotterdam: A. A. Balkema. 1985 The boundary stresses and strains for composite rock masses under three dimensional compressive stress have been analysed to elucidate the failure mechanism and conditions. and determine the strength of the composite mass. Laboratory triax,al tests were carried out using composites of glu~xt mudstone and limestone. Theoretical and experimental results were in good agreement. 866193 Numerical modelling and geomechanics (soil-rock-concrete) Zienkiewicz. O C In: Mechanics o f Geomateriais: Rocks, Concrete, Soils (palu,r to the I U T A M William Prager Symposium, Et,anston, I1-15 Sept 1983) P471-499. Publ Chicheyter: John Wiley. t985 The first part is concerned with the basic mechanics and tbrmulation to describe geomaterials as two phase media. Developments of the Blot type formulation are described. Secondly, numerical solutions of the derived equations are considered. Thirdly, material models are examined, including the distributed cracking model to describe tensile failure and cracking, joint models, and models to describe the behaviour of geomaterials under static, cyclic or transient loads, or which account for rate effects and deterioration. Finally, some practical engineering problems are examined using the numericalfinite element solution. The importance of step-by-step nonlinear amdysis for the dynamic analysis of soil or concrete structures is demonstrated. 56 refs.
Rotterdam: A. A. Balkema. 1985
866194 Numerical models for dynamic loading Sandler. 1; Baron. M In: Mechanics o f Geomaterlals: Rocks, Concrete, Soils (paper to the I U T A M William Prager Symposium, Eeanston, ! i-15 Sept 1983) P501-526. Publ Chichester: John Wiley. 1985
A deformation model is proposed to express the deformation characteristics of overconsolidated geological materials. It is a simple elasto-plastic model with no yield surface and is based on an anisotropic hardening rule. Upon investigating the applicability of this model, it was found that it can be applied to various geologic materials.
An overview of some of the considerations involved in the construction of numerical models for dynamic loading for geological materials is presented, including simple and more detailed plasticity models and cap models, and brief descriptions of their behaviour are given. The role of laboratory and in situ experimental data in material modelling is examined.
Proc 5th International Conference on Numerical Methods in Geomeehanics. Nagoya, 1-5 April 1985 VI P301-308. Puhl
(" 1986 Pergamon Journals Ltd, Reproduction not permitted