Mechanism Analysis And Engineering Application Of Pile-anchor Retaining Structure In Deep Foundation Pit

Deep foundation pit engineering is a comprehensive very strong system engineering,it is mainly composed of earthwork excavation and foundation pit supporting.Foundation pit engineering is an underground space below the surface.And the foundation pit support is the retaining,reinforcement and protection measures for the side wall of the foundation pit and surrounding environment,which is to guaranteeing the foundation pit excavation and foundation construction successfully implement.While deep foundation pit support is crucial.Its value not only shows ensuring their own safety,but also is in effectively controlling the pit surrounding strata.Based on the documents of foundation pit support collected on diamond constellation project in the newly-developed Shannan District of Huainan city,this paper focus on pile anchor support structure by way of systematical analysis and deep comparison.It is carried on the basis of the relevant literature and norms,combined with theoretical knowledge and practice.Also it is implemented by Coulomp GE05 software.The main body of the thesis includes:1.This paper starts with the overview of project and data analysis.After the study and evaluation,the row piles and bolting support method is selected.2.This part discusses on deep foundation pit anchor support,and analysis the mechanical theory of pile anchor support.Monitoring scheme on deformation of deep foundation pit is written.3.By Coulomp GE05 software,this topic proceeds numerical simulation on the deep foundation pit excavation and working conditions that support are different.Then the influence of different excavation depth on the displacement of retaining piles and the internal force of piles are analyzed.The numerical simulation results are compared and the conclusion is drawn.4.Through the numerical simulation results of the software,the paper analyzes the influence of the pile diameter,the pile spacing,the anchor spacing and the range of the bolt pre-stress on the supporting shape of the pile anchor support structure,and puts forward some reasonable suggestions.When the other factors do not change,only change a kind of influence factors,through the Kulun GE05 software simulation analysis and comparison:1)With the increase of the diameter of the supporting pile,the displacement of the pile gradually decreases,but the trend of the reduction is gradually slowed down,while the bending moment of the retaining pile is gradually increasing.2)With the decrease of the distance between the supporting piles,the displacement of the pile is also reduced,but when the pile spacing is too large,it will cause a serious displacement of the pile,which will cause the accident.3)With the decrease of the spacing of the anchor rod,the displacement of the pile body is gradually reduced in a certain range,but the displacement of the pile top is more and more big.4)With the increase of the prestressing force,the displacement of the pile and the bending moment of the pile will be reduced,but the displacement of the pile top will increase gradually.Therefore,in the actual project,that is,to ensure the absolute safety of the foundation pit,but also to take into account the economy,select the appropriate parameters.