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Abstract
Expansive or swelling soil exists in many areas of the world. They show excessive volume changes with change of
water content. If this volume change is restricted, expansive soils apply vertical and lateral pressures to the structures located or buried in them. Many researches have been carried out on the vertical component of the swelling pressure helping engineers to
design structures capable of resisting these vertical stresses.
However, lateral swell behaviors of swelling soils have not yet received enough attention. Structures such as basement walls, under ground tanks, canals, tunnels, under ground conduits, and swimming pools which will be built in expansive soils have to be designed to overcome the vertical swelling pressure and the lateral pressure exerted by the soil as well. For this aim, accurate and reliable methods are needed to predict the magnitude of
lateral swelling pressures of expansive soils and to understand the lateral swelling behavior of expansive soils.
In this research work, the lateral swelling behavior of expansive clay obtained from a site at New Cairo City is investigated using a modified oedometer cell which was developed in the Soil Mechanics Laboratory, Civil Engineering Department, Faculty of Engineering of Mataria, Helwan
University. The results were compared with those obtained from the conventional oedometer cell.
Also, in this experimental study, different cases of loading and different loading conditions were carried out for both lateral
swelling and vertical swelling tests. The results which were obtained from each method of testing were evaluated.
Undisturbed samples were used in these tests to measure the magnitude of the lateral and vertical swelling pressures. To study the relationship between the lateral and vertical swelling pressures, they were measured simultaneously in some tests and
separately in other tests.
Samples having different initial water contents and different dry densities were used to study the effects of these
parameters on the lateral and vertical swelling pressures and deformations.
Finally, a method for determining the lateral swelling pressure corresponding to certain lateral deformation and certain vertical stress was suggested. Typical results obtained from the
tested soil were demonstrated.