Creep of soils feda j. Experimental investigation on the creep behavior of an unsaturated clay 2019-01-25

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Mechanisms of Collapse of Soil Structure

creep of soils feda j

The present study, based on laboratory tests, presents some examples of nonstandard behaviour. The emphasis was laid on the shear behaviour and one-axial compression. The compression index is considered an indicator of soil resistance to compaction, C s is used as a measure of soil mechanical resilience, and sigma pc is considered the soil load support capacity. However, our hypothesis could not be supported, as Îș was not correlated with either ÎČ T or ÎČ S P N 0. ~lso this method al~ws the correct interpretation of l~'essm'e~ t e r tests. The in-situ obsarvat~ons were compared with laboratory creep test data already p~blished.

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Creep of Soils : Jaroslav Feda : 9780444988225

creep of soils feda j

The effect of shear on grain crushing is dealt with. The newly developed creep test apparatus is capable of measuring the displacement with respect to time under the application of a constant creep stress. Feda 2000 Feda , 2004 analyzed different mechanisms of collapse and discussed the influence of soil structure on collapsibility. Summary In this volume, soil creep is analysed within the framework of other soil-rheological phenomena, such as stress relaxation and long-term resistance, to present an in-depth discussion of the effect of time on soil behaviour. Regardless of the micromechanisms that cause creep Bassett, 1978; Feda, 2004 , most researchers assume a linear relationship between creep settlement and log time.

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Interpretation of creep of soils by rate process theory

creep of soils feda j

Clayey soil from a landslide is assumed to have already reached the residual-state, necessitating a study on residual strength to understand the creeping displacement behavior of clayey soils from landslides. The intensity of grain crushing depends in addition to stress level, grain resistance and time on the shear path. Particulate materials consisting of solid structural units in mutual contacts are highly dissipative media. It is commonly accepted that the yield point during one-dimensional compression is related to the initiation of marked particle crushing. Stepwise transformation of the compression curve produced by progressive grain crushing was observed. Collapses from the macromechanical point of view occur by loading, by wetting, by creep, by radial softening, by excess pore water pressure. The mechanical behaviour of the fragmentary soil is influenced by the presence of macrovoids and shows further size and time effects, which makes the description of the clay fill behaviour difficult.

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Creep of Soils by J. Feda by J. Feda

creep of soils feda j

Observational methods such as the Asaoka or hyperbolic methods are widely used in practical applications to assess final settlement and the degree of consolidation during preloading. Preloading is a popular technique in ground improvement works on soft compressible soils. The classification is not exhaustive. Results indicate that, in the double-logarithmic coordinates, the axial strain increases linearly and the axial strain-rate decreases linearly with the elapsed time; the axial strain and strain rate increase with increasing deviator stress levels and decreasing matric suction. ~I~e second discusses a set of ultresonic and ra~io~etrle tests carried out to s t u ~ some stznzcture characteristics of soil-l~rticle and bond orientation within the samples.

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Creep of Soils by J. Feda by J. Feda

creep of soils feda j

Field examples of collapse are presented to emphasize the practical importance of collapse studies. This approach represents an alternative when solving the above soil mechanics problems. L'article décrit l'utilisation de données expérimen-tales obtenues dans quatre types de sol afin d'analyser en termes des contraintes effectives le fluage distorsionnel et volumétrique à l'aide de la théorie de la vitesse du phénoméne fluage. Evaluation of the experimental results. Nonstandard compression and creep of some geo materials are presented.

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Experimental investigation on the creep behavior of an unsaturated clay

creep of soils feda j

Water content and temperature fluctuations. Creep and the accuracy of its prediction. Session f o u r. A m~Lfied v~rs~on of the classical oedometer test procedure is described. La théorie de la vitesse d'un phénomÚne fluage , ayant pour but la description de la vitesse secon-daire de fluage, peut se généraliser en tenant compte des changements structured des sols le durcissement ou le ramollissement de la structure, caracterisés par l'augmentation ou la diminution du nombre de liens structurels.

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CAB Direct

creep of soils feda j

In the course of creep, either time- and strain dependent structural hardening or softening occur, the first one being typical for volumetric creep, the second one for distortional creep. Particle-based conception: Fabric as the principal constitutive factor, Mixed analysis. This volume should be of interest to civil engineers, scientists, research and postgraduate students, and advanced undergraduates. Principal macro- and microrheological theories are analysed, and a comprehensive picture of the soil structure and of the effect of state parameters is presented, documented by the author's experiments and illustrated by many examples. An elastoplastic model is enhanced to take into account the influence of this phenomenon. Soil stress-strain behavior: measurement, modeling and analysis.

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Interpretation of creep of soils by rate process theory

creep of soils feda j

A statistical analysis was carried out on the data for the observed levels of damage to investigate the frequency variation with increasing applied stress. The total c e s s a t i o n of creep was lm~lnced d u r i ~ a p e r i o d of very ~w Z~uv~ry and after a chem~e i n t h e Ix~Zrolo~ of the sliding mass. The theory of hereditary creep was selected as the best theory serving the author's purpose to propose simple constitutive relations governing creep of soils. The latter acquired the form of a diffusion process. Three problems are dealt with: stress propagation, subsidence trough formation and diffusion process. Viscous property of kaolin clay with and without ageing effects by cement-mixing in drained triaxial compression.

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