Improve Geotechnical Design Parameter of Some Soft Clayey Soils

The shallow Soft Clayey deposit is common in Alexandria-Egypt. Most soft clays their natural state are unsuitable for supporting any structure. Thus, improvement treatments exist to strengthen these soils so that improved soil can have adequate bearing capacity without undergoing failure or producing substantial excessive settlement post construction and applied loads them. This paper presents a case study of an site the city center, which reclaimed part Maryout Lake, where highly compressible clay with water content varies from 200% near surface 90% at base deposit. A prefabricated vertical drain preloading has been used improve this soil. Values shear parameters consolidation coefficient back-calculated field measurements compared values lab situ tests. provides different relationships comparisons prediction estimation compressibility laboratory studies particularly studies. Also, some correlation related index properties presented. results display noticeable properties.