الفهرس 
ACKNOWLEDGEMENT
Objectives of present workOnly 14 pages are availabe for public view
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Abstract
One of the most recent soft soil improvement methods is the preloading in addition to prefebricated vertical drains. Recently, this method become more familiar Specially, in the coastal areas which had saturated soft soils. This method shows very good results for reaching maximum degree of consolidation in soft soil deposits. Preloading includes 2 parts firstly, the load pressure that equal the expected weight of the structre secondly, the overburden pressure. Preloading takes the form of embankment, it is very important to reduce the time and accelerate the spilling - out of water throwout PVDs to reach to maximum degree of consolidation. This preloading process goes under schedule time.
Theorytically and practically, the different consolidation theories and their differential equations had been used in simulating these PVDs for reaching the degree of consolidation ̀ equations. Thus, using the modern theories to equal the axisymmetric analytical model to the 2D plane strain model, where the commercial computerized programs were used.
This research main aim is to establish a numerical model for two & three layers to represent the behavior of consolidation in these layers. The analysis is carried out using 2D finite element numerical model PLAXIS. The model is capable to predict the degree of consolidation and settlement of these layers, to study the availability of the equivalence of multi - layer to one layer, and to study the variation for degree of consolidation between numerical and analytical solution.