Study On Prediction Model Of Ultimate Bearing Capacity Of Uplift Piles

With the rapid development of our national economy,just unfolding civil engineering construction,deep foundation is applied more and more widely,pile foundation plays a very important role in the engineering construction,the anti pulling pile is widely used in underground anti floating structures,lightweight structures,deep excavation and expansive soil area tall etc..How to predict the bearing capacity of the pile and ensure the safe use of the pile.In this context,this paper mainly in the following aspects:(1)the development history of the pile foundation is expounded,and the research status of the pile is summarized,including the field test research,the model test research and the ultimate bearing capacity calculation.(2)the theoretical research on uplift pile foundation.On the basis of the relevant references,the paper analyzes the similarities and differences between the failure form of the uplift pile,the load transfer mechanism of the uplift pile and the bearing pile and the calculation method of the bearing capacity of the pile.(3)according to the existing technical specifications of pile foundation,the calculated values tend to be conservative,resulting in the waste of resources and the improvement of Engineering cost.In this paper,taking into account the weight of the pile body,through the adjustment of the reduction coefficient to estimate the bearing capacity of bored pile.(4)to uplift pile test a project in Nanchang is in accordance with the relationship between load,uplift pile displacement,using field test data,based on Origin8.0software,data fitting with hyperbolic model and exponential model,power function model,and comparing the measured curve and curve fitting analysis.On this basis,the ultimate bearing capacity of the pile is predicted,and the result of the power function model is close to the ultimate uplift capacity of single pile.