الفهرس 
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Abstract
This thesis presents the ability of improving the clayey soil properties of East Port-Said by the Deep Mixing Soil method (DSM) and its effect on a quay wall design and displacement performance. First, different kinds of soil improvement techniques and their applications are discussed. Then, the thesis particularly focuses on the Deep Soil Mixing method (DSM) as the most common soil improvement technique used around the world. Besides, a previous recent study of the East Port Said clay strata is introduced showing every layer’s geotechnical property. As well, an experimental test is conducted to study the effect of treating the soil with cement. First, a navy quay wall construction site was visited, and two samples of soil are picked during excavation works. Then, the samples were treated with cement and were tested to get the ultimate unconfining pressure. General equations that were formed for treated soil were applied to the new soil to get its modified properties data. Three proposals of quay wall were presented, and a three-dimensional finite element (Plaxis 3D version 2020) was used to simulate them. The first one is a combi wall with one anchor row in which the king pile is a steel tubular pile filled with concrete and with a closed toe. The second proposal is similar to the first one, but the toe of the pile is open, and its lower quarter is plugged with soil. Also, the DSM is applied in the third proposal which included nine cases, where the DSM block width differs from one case to another in both zones the active and the passive. The effect of DSM block width variety is shown in terms of bending moments, shear forces, horizontal and vertical displacements, and axial force for both front and back walls and the corresponding cross-sections and geometry dimensions. Moreover, the axial force in the anchor rod was checked. The total cost for each case was estimated and a comparison between them was carried out as well to get the most economic case. Finally, an extra case was presented to study the effect of cement dosage in DSM on the quay performance wall as well.