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Determination of soil bearing capacity has been a subject for both geotechnical engineers and designers for a long time and a variety of relationships have been proposed to determine the ultimate bearing capacity of homogeneous soils. One of the most primitive equations in bearing capacity of foundations, which was Based on prandtl's (1920) bearing capacity, with some modifications, was proposed by Terzaghi. In many lands, the soft clay layer Located in a low depth of subsurface soil profile. Either the foundation should be laid in greater depth on the stiff clay or a layer of compacted sand can be used to improve the ultimate bearing capacity. Most of the recent works, which have done so...