Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Civil Engineering

Stone columns are one of the most effective systems used in soil improvement techniques which depend on alteration of the in situ properties of soil by installation columns composed of granular material.This improvement in soil is focused on reducing settlement, increasing bearing capacity, accelerating consolidation time, increasing stability of structures and control liquefaction. In most cases, end bearing stone columns are used. But in cases where deep soft soils are found, floating stone columns may be adopted.Generally, the behavior of floating stone columns has not been well understood.Therefore a 3D numerical modelling technique using Plaxis 3D software is necessary to understand this behavior to provide some practical vision in geotechnical design. A verification model has been conducted to validate stone column modelling and its output results using actual field data measurements.The 3D numerical model has been used to study and evaluate the effect of practical values of floating stone columns lengths and spacing. In addition the effect of related practical parameters such as loading technique, foundations dimensions and foundations rigidity. And study the effect of these parameters on the consolidation settlement of the soil and the required time of consolidation

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