Study On Influencing Factors Of Bearing Capacity Of Multi-branch Squeezed Cast-in-site Pile And Numerical Simulation

Squeeze expanding branch cast-in-place pile is a new type of pile modified from the conventional constant cross-section concrete cast-in-place pile. The physical properties and mechanical index of the foundation are improved since the branches or load bearing blocks are formed by the squeezing of soil at different depths of the pile with special fluid power equipments, at the same time, the former friction end bearing pile with one bearing point is transformed into end bearing friction pile with several bearing points, so the stress mechanics is varied, the bearing capacity of each stratum is fully utilized, the vertical bearing capacity of the pile is enhanced, its deformation under loads is reduced correspondingly, the earthquake resistance of the pile is good.The main work and conclusion of the paper are listed as follows:(1) Introduced the current situation in research and issues of Squeeze expanding branch cast-in-place pile, and summed up the main points of shape design and construction technology of the pile.(2) The mechanics of confectioning, load transmission characteristic and failure mechanism of squeeze expanding branch cast-in-place pile is analyzed.(3) The methods of determine to bearing capacity and settlement are introduced. The main influencing factors of bearing capacity of squeeze expanding branch cast-in-place pile are analyzed comprehensive.(4) Base on the finite element method, the major factors that affect the bearing capacity and work behavior of multi-branch pile are studied to find out the valuable regulars which can improve the bearing capacity and economic efficiency of the multi-branch squeezed cast-in-site pile.