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Abstract The tangent modulus method of undisturbed soil is used to calculate the nonlinear settlements of soil foundation and pile foundation separately；and the nonlinear relation P-S(load-settlement) curves of the soil foundation and pile foundation are obtained. Supposing that the soil foundation and pile foundation are acted independently，simultaneously considering that the settlements of soil foundation and pile foundation are equal，then we can obtain the load acting on the soil and pile by the P-S curves. Then，by controlling the settlement value and adjusting the thickness of cushion，the relative stiffnesses of soil and piles can be matched to make the best use of the bearing capacities of soil and pile foundation；and the settlement of the composite foundation can reach the desired aim. Consequently，the design of combination foundation can reach the perfect optimized condition. Finally，the implementation process of the method is explained by the case study.
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Received: 30 July 2010
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2011, Vol. 30 
