Considering spatial mutual interaction and deformations among ring beam
middle beams
row of piles
braces and foundation soil in the deep excavation structure
the 3-D finite element analysis model is set up based on the mutual deformation theory; and specific method is settled to calculate the equivalent foundation stiffness and earth pressure. By analyzing an excavation case
the distribution rules of the inner forces
the deformations and earth pressures in the row of piles structure with ring beam are analyzed; and the results calculated with 3-D model and 2-D model are compared. Therefore
the reasonableness of calculating model and the necessity of 3-D analysis are verified.