Deformation and Internal Force Variation Law of Cantilever Three-Row Pile Support Structure under the Condition of Pile-Soil Deformation Coordination

Abstract

At present, the three-row pile support structure is gradually used in engineering practice, but there is no mature calculation theory and design code for reference. To solve this problem, considering the coordination of pile-soil deformation, the three-dimensional finite element analysis of the three-row pile support structure is carried out, and the monitoring data of the actual project are compared to verify the rationality of the calculation method. On this basis, the effects of different factors (pile embedded depth, pile diameter, row spacing, pile spacing, excavation width, crown beam elastic modulus) on the deformation and stress of three rows of piles are studied. The numerical analysis results show that the embedded depth of three-rows piles should be 0.5h (H is the excavation depth of foundation pit), the pile diameter should be 400mm, and the row spacing and pile spacing should be 3d ~ 4d (d is the pile diameter). These laws provide a theoretical basis for the design and construction of a three-row pile support structure.