Transitional Plasticity Compression Model for Clays
21 Jul 2016-pp 217-224
About: The article was published on 2016-07-21. It has received None citations till now. The article focuses on the topics: Plasticity & Compression (physics).
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TL;DR: In this article, a new normalizing parameter called the void index is introduced to aid in correlating the compression characteristics of various clays, such as sedimentation compression curves for most, but not all, natural clays lie well above the corresponding intrinsic compression curves.
Abstract: The compressibility and strength characteristics of reconstituted clays are used as a basic frame of reference for interpreting the corresponding characteristics of natural sedimentary clays. The properties of reconstituted clays are termed ‘intrinsic’ properties since they are inherent to the soil and independent of the natural state. The properties of a natural clay differ from its intrinsic properties due to the influence of soil structure (fabric and bonding). Thus the intrinsic properties provide a frame of reference for assessing the in situ state of a natural clay and the influence of structure on its in situ properties. A new normalizing parameter called the void index is introduced to aid in correlating the compression characteristics of various clays. The sedimentation compression curves for most, but not all, natural clays lie well above the corresponding intrinsic compression curves. A consequence of this is that such clays are more sensitive and brittle than the reconstituted material and the...
1,485 citations
Abstract: The shortcomings of the curves normally used to describe the change of volume of a soil skeleton with variations in mean effective stress are discussed. The author proposes an alternative approach, without the use of void ratio, adopting specific volume. Expressions are derived to show that natural volumetric stresses and strains are linearly related. Some consequences of this new relationship are examined. The coefficient of volume compressibility is defined, and the theory of soil consolidation in an oedometer investigated. Predictions of pore water pressure and effective stress changes are better than those of the conventional linear theory. The cam clay soil model is modified to give a revised critical state line which is well supported by experimental evidence. Equations are derived which could provide a basis for a simplified presentation of state boundary surfaces. (TRRL)
521 citations
TL;DR: In this paper, the authors show how field measurements of displacement around foundations and excavations combined with numerical analysis and recent developments in laboratory techniques can be used to estimate the displacement of foundations.
Abstract: The purpose of this lecture is to show how field measurements of displacement around foundations and excavations combined with numerical analysis and recent developments in laboratory techniques ha...
423 citations
TL;DR: In this article, a simple technique for accurately measuring the mean local axial strains of triaxial samples over a central gauge length is described, which makes use of an axial displacement gauge, which is a development of one devised by Burland & Symes (1982) which made use of electrolytic levels.
Abstract: This Paper describes a simple technique for accurately measuring the mean local axial strains of triaxial samples over a central gauge length. The technique makes use of an axial displacement gauge which is a development of one devised by Burland & Symes (1982) which makes use of electrolytic levels. The device can resolve to less than 1 μ.m over a range of 15 mm, is simple to mount on the specimen and is not damaged when the sample is taken to failure. The results of undrained triaxial tests are presented for a wide spectrum of soil types ranging from sands through intact, reconstituted and remoulded low plasticity till, undisturbed London clay to intact unweathered chalk. The test results show that conventional external measurements of displacement contain errors which are frequently so large that their use in the determination of soil stiffness at working levels of stress is invalid. The errors mainly result from tilting of the sample, bedding at the end platens and the effects of compliance in the app...
384 citations
TL;DR: In this article, the linear relation between the specific volume and the logarithm of the pressure for the isotropic consolidation has been widely incorporated into elastoplastic constitutive equations of soils.
Abstract: The well-known linear relation between the specific volume and the logarithm of the pressure for the isotropic consolidation has been widely incorporated into elastoplastic constitutive equations of soils. It is, however, indicated in this article that this relation has several physically unaccepted properties. Instead of this relation it is recommended to incorporate the linear relation between both logarithms of the volume and the pressure into constitutive equations, which does not have any of the unrealistic properties.
98 citations