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Abstract According to the deficiency of existing composite foundation research calculational model about the shear displacement method，rigid pile is divided into two sections at the depth of short pile length and the stress compatibility is considered. The shear displacement method calculation about different pile lengths and conformability to the actual soil layer distribution around the pile can be achieved. Through equivalent stiffness K of the contact soil body around the piles，the interaction when soil and pile simultaneously receive load can be considered，and the actual interaction between soil and pile can be taken into account. Through different stiffness influential coefficients b，the interaction of the difference among flexible short pile，rigid long pile and soil is considered. The calculational model and program are established through other existing research calculation model about the interaction and project example analysis，and the calculation model is proven to be reasonable and feasible.
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Received: 15 July 2009
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