Research On The Influence Of Uplift Pile/Anti-Floating Anchor Arrangement Type On The Foundation

With the rapid development of urban construction,the land in the city is increasingly scarce.As a result,some measures have been taken to solve this problem.One is that the single building is higher and higher,which results in increasing depth of the underground part of the structure;the other one is that there are more and more underground stations,underground parking,underground shopping malls and other underground structures in our city that have made groundwater buoyancy effect on the building structure could not be ignored.Although there are many anti-floating measures,uplift pile has been used in a large number of practical engineering because the uplift pile is simple,economical and reliable.There are many factors could influence the foundation,and the uplift pile layout pattern has an important impact on the foundation slab internal force and deformation.The author have done some works for this paper.Firstly,the mechanism and the calculation method of uplift pile have been described which are the theoretical basis for subsequent analyzes.Secondly,the finite element numerical calculation software MIDAS / GTS has been introduced,and the pile unit is a powerful tool for researching this subject.Although the parameter is simple,it can simulate pile-soil interaction.On these basis,the core subject of this paper will be studied: the influence of uplift pile layout type on the internal forces of the foundation,and this subject is based on a real project which is located in Beijing,fully using the true parameters,structural material and size.The foundation slab internal force and deformation,foundation beam internal force,pile axial force and other results of three typical uplift pile layout pattern in different groundwater level will be described.An obvious conclusion could be get that there is a best uplift pile layout pattern for a certain groundwater level.Base on this conclusion,the author have researched the impact on foundation beam internal force caused by the different distance form uplift pile to column,so the author have found the most suitable distance which can make the foundation beam internal force achieve a balance between the highest groundwater level and the lowest level.The engineers will not distinguish the uplift piles and anti-floating anchor in engineering,for this phenomenon,the author have done a comparison between uplift piles and anti-floating.Not only the difference of uplift piles and anti-floating is unclear,but also the punching shear failure of foundation slab is a serious problem in actual engineering.This paper have made the introduction about the mechanism of punching failure and list several reinforcement measures to improve the foundation slab's anti-punching shear capacity.This paper have systematically researched the impact on the foundation caused by the uplift pile layout pattern,and the author hope the conclusions could provide a useful reference for future research and engineering design works.