Horizontal Load Test And Numerical Analysisof The Elastic Expansion Long Belled Pile

With the rapid development of national economy, there a large number of high-rise buildings, offshore drilling platforms, deepwater ports and other forms of buildings appear,not only pile foundation has high bearing performance in vertical and low sedimentation rates but also should withstand uplift and horizontal load effect.This paper summarizes the research status of the elastic belled long pile at home and abroad, explains the factors that influence the level of classification, characteristics, failure mechanism and bearing performance of the pile, introduces the bearing characteristic of research methods and theories.Then based on the commercial housing, through the comparative analysis of the experimental data, we analysis the horizontal bearing capacity of the elastic long belled pile.And a numerical analysis model is established by finite element software ABAQUS, by changing the model of belled diameter, pile diameter, pile material strength, soil elastic modulus of elastic long belled pile and soil were studied, which can provide a theoretical basis for the application in the engineering design of the belled long pile.ns of this paper are as follows:（1）By the test pile H-Y₀ and H-ΔY₀/ΔH curve can be clearly observed,In the process of horizontal load increasing, large diameter belled long pile body elastic soil and the surrounding elastic, plastic and experienced three stages of destruction.（2）The experimental results of the data analysis, considering all the conditions obtained S1 pile and the test pile S2 level critical load value, the horizontal ultimate bearing capacity value and characteristic value of bearing capacity and pile top displacement corresponding respectively. : 420KN/9.7mm 、 480KN/6.63 mm 、660KN/45.3mm、720KN/30.74mm、336KN/7.92mm、384KN/3.58 mm.（3）The ratio coefficient m of the horizontal resistance coefficient and the horizontal load of the pile top displacement and the pile top is obviously nonlinear,Formulas can be used to express as m=a·e^b·H and m=aY^b₀,also provides the necessary parameters for the design of the horizontal bearing capacity of the elastic long pile.（4）Elastic belled long pile and belled diameter and the material strength of the pile level for the zeros of the horizontal displacement of the pile and the pile without affecting the basic changes in the piles, and diameter of the pile body horizontal bearing performance impact is relatively large, but in the specific project hard considering economy, construction technology and design requirements, and other factors to select the reasonable pile diameter and pile body material strength grade.（5）The elastic modulus of the soil can enhance the horizontal resistance of the pile, and the horizontal bearing capacity of the long pile is improved.