Abstract
A calculation method of the bearing capacity of single squeezed branch pile is established based on the load transfer method. In the method, the hyperbolic model is used to describe the nonlinear load-displacement relationship of pile-soil interaction at the pile tip, the pile skin, and the squeezed branch, and the theoretical expression of six load transfer coefficients of squeezed branch pile is given. The correctness of the method is proved by a small-scale model test in homogeneous soil and a large-scale model test in stratified soil. The results show that the calculation based on the load transfer method is applicable to predict the ultimate load in engineering application.
Highlights
Foundation reinforcement is a conventional technique to improve foundation bearing capacity [1]
Wang [4] and Xu [5] believe that the squeezed branch pile is a multipoint support pile and has a larger bearing capacity and a smaller settlement than a bored pile with the same diameter. e squeezed branch pile can meet the requirement of heavy structure to the bearing capacity of foundation, and it has been widely used in pylons, highspeed and heavy-loaded railway, and other projects
Li [7], Zhang [8], and others completed some static load tests of practical engineering piles and found that all the squeezed branch piles in different sites showed the advantages of high bearing capacity and small settlement, and the contribution rate of squeezed branch resistance
Summary
Foundation reinforcement is a conventional technique to improve foundation bearing capacity [1]. In order to obtain the general rule of the influence of squeezed branch on the bearing capacity of pile, Zhang [9, 10] has done a transparent soil model test based on transparent materials and particle image velocimetry (PIV) technique and found that the improvement of pile bearing capacity is due to the increase of the ranges of the deformation and displacement field of the soil around the pile and decrease of the maximums of deformation and displacement. Li [15] has presented a nonlinear method to analyze the bearing capacity of the squeezed branch pile based on the iterative algorithm of piecewise displacement and has studied the influence of four parameters, the friction angle of pile-soil interface, horizontal Earth pressure coefficient, the failure ratio of shaft resistance, and the failure angle of the soil under pile pit, on the bearing capacity of pile. Based on the load transfer method, a simple method to calculate the bearing capacity of squeezed branch piles is established in this paper, and the load transfer coefficient of the squeezed branch is regarded as a function of branch diameter. e reliability of the calculation method is proved by comparing the calculation results with the results of small-scale model test in homogeneous soil and large-scale test in layered field
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