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Inelastic Deformation Characteristics of Geomaterial
Abstract The inelastic strain characteristics of geomaterial are analysed in the framework of a non-linear three-component model while based on a number of laboratory stress-strain test results. The followings are shown. Inelastic strain increments develop by plastic yielding that is controlled by viscous effect and inviscid cyclic loading effect. Inelastic strain increments that develop by these different factors cannot be linearly summed up. The concept of double yielding consisting of shear and volumetric yielding mechanisms is relevant to describe the plastic yielding characteristics of geomaterial. Shear yielding is dominant with dense granular materials while volumetric yielding with soft clay. Three basic viscosity types, Isotach, TESRA and Positive & Negative, have been observed with different geomaterial types subjected to shearing. The viscosity type is controlled by geomaterial type in terms of grading characteristics, particle shape and particle crushability. Inviscid cyclic loading effect is analysed in relation to plastic yielding and viscous effect. The ageing effect on the inviscid shear yielding characteristics and its interactions with the viscous effect are examined and modelled. Three different types of time effect (i.e., delayed dissipation of excess pore water pressure, viscous effect or delayed development of plastic strain, and ageing effect) are involved in a complicated way in soft clay consolidation. Related some fundamental issues are analysed in the framework of the three-component model in the case of Isotach viscosity.
Inelastic Deformation Characteristics of Geomaterial
Abstract The inelastic strain characteristics of geomaterial are analysed in the framework of a non-linear three-component model while based on a number of laboratory stress-strain test results. The followings are shown. Inelastic strain increments develop by plastic yielding that is controlled by viscous effect and inviscid cyclic loading effect. Inelastic strain increments that develop by these different factors cannot be linearly summed up. The concept of double yielding consisting of shear and volumetric yielding mechanisms is relevant to describe the plastic yielding characteristics of geomaterial. Shear yielding is dominant with dense granular materials while volumetric yielding with soft clay. Three basic viscosity types, Isotach, TESRA and Positive & Negative, have been observed with different geomaterial types subjected to shearing. The viscosity type is controlled by geomaterial type in terms of grading characteristics, particle shape and particle crushability. Inviscid cyclic loading effect is analysed in relation to plastic yielding and viscous effect. The ageing effect on the inviscid shear yielding characteristics and its interactions with the viscous effect are examined and modelled. Three different types of time effect (i.e., delayed dissipation of excess pore water pressure, viscous effect or delayed development of plastic strain, and ageing effect) are involved in a complicated way in soft clay consolidation. Related some fundamental issues are analysed in the framework of the three-component model in the case of Isotach viscosity.
Inelastic Deformation Characteristics of Geomaterial
Tatsuoka, Fumio (author)
2007-01-01
108 pages
Article/Chapter (Book)
Electronic Resource
English
Triaxial Compression , Stress Path , Constant Strain Rate , Triaxial Compression Test , Monotonic Loading Physics , Soft and Granular Matter, Complex Fluids and Microfluidics , Continuum Mechanics and Mechanics of Materials , Building Materials , Geoengineering, Foundations, Hydraulics , Numerical and Computational Physics
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