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University of Arizona (1970)

Dynamic testing of desert soils

Abu-Obeid, Hamid A

Titre : Dynamic testing of desert soils

Auteur : Abu-Obeid, Hamid A

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1970

The consistent dependence of civilization and engineering work on machinery necessitates more investigations on their dynamic effects on soils. Explosive shocks and earthquakes, in general3 cause vibrations with high amplitude within very short periods of time, and these have strong effects on soil behavior and may cause settlement for structures built on cohesionless or slightly cohesive materials. Linger (1963) found that the frequency of vibrations is of more importance than the amplitude. Pettibone and Harden (1964) stated.that the amplitude of the vibrations is the most significant variable which affects soil density. The objectives of this research were to study the .dynamic effects-of consolidation on soils with high potential for collapse collected from the Tucson, Arizona area (Figure 1). The hydrodynamic influence on the permeability coefficients was given consideration. • A maximum of 200% increase in the consolidation was achieved when samples of silty sand grade composition were subjected to vibration of their natural frequencies and a static load of one quarter ton per square foot* As a result, the vertical coefficients of permeability were reduced to 20% of their original values.

Mots clés : Soil mechanics. ; Desert soils — Arizona.


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