interactions des fondations et des sols gonflants : pathologie ... - Pastel

Abstract
INTERACTIONS OF FOUNDATIONS AND EXPANSIVE SOILS: PATHOLOGY,
CALCULATIONS AND EXPERIMENTAL STUDIES
Houssine Ejjaaouani
This report is divided into six chapters. In the first chapter the problems of expansive
clayey soils around the world and in Morocco are reviewed, then their physical and
mechanical properties, mineralogy and structure are described, with emphasis on
their behaviour during wetting. In the second chapter, on the basis of the authors’
experience, the various damages observed in buildings in Morocco because of the
expansion of clayey soils are described.
The following two chapters are devoted to the calculation of stresses in shallow
foundations and of the foundation settlement or heave: Chapter 3 analyses the stress
changes in reinforced concrete shallow foundations which are induced by the non
homogeneous heave produced by soil wetting from a water source which can be
located at any position with respect to the structure. Chapter 4 is devoted to the effect
of the foundation load on the stress state in the soil and on the strains which develop
upon wetting and can produce either settlement or heave, depending on the relative
values of the swelling pressure and the vertical stress in the soil.
The last two chapters present an experimental study of shallow foundations on
expansive soils, which was performed in the city of Ouarzazate: In Chapter 5 the
results of laboratory tests on soil samples taken at two depths under the foundations
are presented and analysed in terms of water content effect on the deformations,
permeability and resistance of the expansive clayey soils. The full scale experimental
site and the results of the load tests performed on four shallow foundations at
different stages of wetting and drying of the expansive soils are presented in Chapter
6. These results are then analysed with due account of the laboratory test results and
calculation formulae presented in the preceding chapters.
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