Research On Pile Anchor Of Deformation Rule About Deep Foundation

With the rapid development of economy, and the rapid advance of reconstruction of cities, the engineering construction of our country is in a rapid development stage, the application of embedded depth of pile body itself to maintain the stability of foundation pile in the deep foundation pit already could not meet the need of modern engineering construction. The application of the prestressan chor technology in deep foundation pit not only improve the safety and stability of the deep foundation pit, and with high efficiency,high quality in construction, and with high input-output ratio. Thus anchor-pile supporting structure become more and more popular in deep foundation pit. But due to the design,construction and other reasons, it triggered more engineering accidents at the same time.Therefore, the problem of similar type of foundation pit deformation aroused people's great attention.This paper presents several different pile anchor support forms based on some certain pile anchor bracing deep foundation pit in Shijiazhuang, and the finite element process PLAXIS is applied to model the several different pile anchor support forms, collect and process the main monitoring data of foundation pit at the same time, analyzed the deformation rule of foundation pit. Under the condition of a more fitting of numerical simulation results and the regularity of data monitored in the field, analyzed the deformation rule of foundation rule under different under different support forms. Finally,we analyzed and evaluated the influence factors of different support forms, and further proposed some corresponding suggestions. The main results are as follows:(1)Under different pile anchor support forms,from the horizontal load-Horizontal displacement curve of pile to observe and analysis, the horizontal load-Horizontal displacement curve of pile was parabolas, And the maximum horizontal displacement is located in the middle-lower part of foundation pit.(2)The curve for the ground settlement of foundation pit was precipitation funnelshaped as a whole, along with the foundation pit excavation and supporting, Settlement curve also appeared several displacement repeatedly rebound, In the practical engineering construction, the monitoring for the ground surface settlement need enhanced to the position at a certain distance from the foundation pit.( 3) The application of anchor prestress could effectively control deformation of foundation pit, a certain trend of spring back was observed in foundation pit horizontal displacement and ground settlement, and the further the anchor layer away from the ground,the smaller the range of influence.(4)Through comparisons of the data monitored in the field and numerical simulation results by Plaxis, the calculation for the shift of pile and the ground settlement around the foundation pit by Plaxis is more conservative,and the calculation results are relatively accurate, there is certain actual directive significance in the design and construction for this type of deep foundation pits.