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Abstract According to design specification，soft soil rigid pile composite bearing capacity of soil between piles are often use too high，the settlement of soft soil under the corresponding designed load is greater than the settlement of composite foundation. But this situation can not happen in reality. So the bearing capacity of soft soil is not fully functional as designed load in engineering practice. The main reason is not considered the pile-soil deformation compatibility. In order to reveal the intrinsic relationship between the deformation compatibility and bearing capacity of soft soil being used much higher than the reality，the p-s curve of the pile and soil respectively is calculated by the tangent modulus method. Then，the rigid-pile composite foundation?s p-s curve is determined by the p-s curves of the pile and soil. The relationship of the deformation compatibility of pile-soil will be established，on the basis of which the load-sharing case of the pile and soil can be analysed. It is found that the designed bearing capacity of soil is much higher than the reality based on normal design norms of composite foundation，while pile load is greater than the designed value. The bearing capacity or strength of pile is inadequate，which leads to foundation failure. For the lack of design norms methods，it was put forward that rational design of composite foundation should consider the deformation compatibility and bearing capacity of soft soil should be determined under corresponding the settlement in terms of its p-s curve. It is established the designed calculation of rigid-pile composite foundation in soft soil ground considering deformation compatibility of pile-soil. It provides a guide for design in the future.
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Received: 20 May 2011
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2011, Vol. 30 
