Design method of composite foundation considering pile-soil deformation coordination
The composite compression modulus obtained by using the compression modulus of pile body is usually larger,which leads to the underestimate of the settlement of composite foundation reinforcement area.In addition,the selection of bearing capac-ity coefficient between piles and soil is subjective,resulting in a larger calculation result of the composite foundation bearing ca-pacity.In view of the above two problems,starting from the formation mechanism of composite foundation,we point out that the pile-soil deformation must be coordinated when the pile and the soil bear capacity together.The conditions for the coordination of pile-soil deformation are as follows:①the depth of pile penetration into the cushion cannot exceed the thickness of the cushion;② piles should be set as friction pile.Under this premise,the settlements of piles and soil between piles were calculated respec-tively.The theoretical values of pile-soil stress ratio and bearing capacity coefficient were obtained by using pile-soil deforma-tion coordination method.Further the settlement calculation method of reinforcement area was given.The engineering example shows that the design of composite foundation should be carried out according to the deformation coordination of pile-soil from the perspective of ensuring the effective design and engineering safety of composite foundation.
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