Dynamic instability of clays: an energy approach |
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| Authors: | Eugene A Voznesensky Steinar Nordal |
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| Institution: | a Department of Engineering Geology, Moscow State University, Vorobiovy Gory, Moscow 119899, Russia;b Department of Geotechnical Engineering, Norwegian University of Science and Technology, N-7034 Trondheim, Norway |
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| Abstract: | The dynamic instability of any soil is based on the ability to accumulate from cycle to cycle a part of the energy to be dissipated. Using the general thermodynamic approach in combination with high resolution experiments it is possible to analyze the transformations of energy in soil under dynamic loading. Undisturbed specimens of two Norwegian clays, sufficiently different in their engineering properties, were used in a number of undrained cyclic triaxial tests to study the influence of confining stress, coefficient of earth pressure at rest (K0), dynamic stress amplitude and frequency of loading in the development of instability in the clays. This paper discusses the unit dissipated energy and the unit activation energy as possible energy criteria for evaluation of dynamic instability in soils. |
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| Keywords: | Energy approach Clays Dynamic load Unit dissipated energy Stress reversal Liquefaction Strength degradation |
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