Research On The Interaction Between The Squeezed Branch Piles And Groundsoil

The squeezed branch pile is a new type of pile emerged only recently. Compared to the uniform pile, it has higher bearing capacity and smaller sinking displacement, thus it is more economical. However, as a newly introduced technology, the theory of this type of piles has not been fully developed. Many of its important characteristics, such as the stress and strain characteristics, have not been determined, as well as the optimal distances between plates and piles.In order to fully develop the theory of squeezed branch piles, in particular, the justification of its superior performance in terms of the bearing capacity and sinking displacement, we have derived the analytical formulas of the axial load and the strain at arbitrary depth; Based on existing static loading test results and research on belled pile, together with the analysis of on-site testing data, we have applied the expand theory on sphere holes to the computation of radial stress of squeezed branch piles under hole expansion; Taking the oil pressure of hole expansion in to account, we have find the a branch force under certain hole pressures, hence we can estimate the maximum bearing capacity of single piles; We have introduced the experiential formulas for the bearing capacity of squeezed branch piles based on its stress characteristic and pile testing data; We have also done numerical simulations of squeezed branch piles utilizing finite element method software ANSYS; We have matched the simulation results with those of on-site basic load experiments, regenerating the distributions of stress fields and strain fields of squeezed branch piles, and from those distributions, we can determine the optimal distances between plates and piles.