الفهرس 
REVIEW OF PREVIOUS STUDIESOnly 14 pages are availabe for public view
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Abstract
Foundations constructed on swelling clays are subjected to
vertical and lateral pressures which act on them and results in
uplifting forces pushing them upwards. These pressures are
generated due to the increase of the clay volume as it absorbs
water. The main aim of this thesis is to investigate the
behaviour of experimental models of square and rectangular
footings with different dimensions resting on expansive soil
under constant stress condition.
Expansive soil was collected from El-Kattamia. Geotechnical
properties of this soil were determined. Effect of initial soil
density on swelling characteristics, using Oedometer and Geonor
apparatus, was studied.
Two groups of tests have been performed under two different
values of stresses to examine their behaviour during unsaturated
upward water flow for a period of up to 4 months for each test.
The extensive data obtained from each model confirmed the
applicability of fitting heave-time curves using the nonlinear
hyperbolic function.
Treatment of expansive soils with sand as a cushion beneath
footings is one among the methods suggested for tackling problems
associated with swelling clays. Therefore, the behaviour of the
experimental models, used in this thesis, as well as the
underlying expansive soil is also examined in a third group of
model tests.