الفهرس 
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Abstract
A new planned city is in south of Port Fouad - Governorate Port Said, Egypt. Its residential buildings are going to be constructed on raft foundation. Main soil stratification at the site is soft soil deposits. It was suggested to stabilize the soil of New Port Said city with stone column. This thesis presents a comprehensive numerical investigation on different parameters that affect design of the suggested stone columns. Finite-element analyses have been performed using PLAXIS.3D.V.20 software. The modeling was verified with published numerical studies. Some of effective parameters studied are the ratio of the Length of stone columns to soft soil height L/H, the ratio of the diameter of stone columns to its length D/L, the distribution pattern, centroid spacing between stone columns, Cushion soil thickness, and Compression index of soft clay. Numerical results were compared with published analytical approach. The investigation recommends suitable cost-effective parameters for the design of stone column in the studied site.