Based on the analytical solution of stresses and deformations for composite foundations with equal strain assumption

the expressions for stress ratio

settlement ratio

radial displacement and lateral pressure coefficient are obtained. The variations with the ratio of compression modulus and the ratio of area replacement are illustrated and compared with the Priebe’s method. The influences of assumptions in Priebe’s method on computational results are also analyzed in detail. The analytical results show that the assumption of ignoring volumetric strain of pile should induce obvious errors in Priebe’s method; and the composite influences of assumptions of radial displacement computation and lateral pressure coefficients are relatively small as a result of counteracting of each influence