Numerical Simulation Analysis Of The Large Diameter And Super Long Pile's Loading Test

Field loading test is the most direct and reliable method to determine the bearing capacity of piles,but for the large diameter and super long piles,this method is time-consuming,laborious and costs heavily.Therefore,this article uses the method of numerical simulation to simulate the process of field loading test,and proves the importance of using numerical simulation method to determine the bearing capacity of piles.Firstly,this paper adopts the method of numerical simulation to analyze the factors that influencing the bearing mechanism of piles,and then,simulates and analyzes field loading test.It mainly completes the following work:(1)Through the arranging and analysis of existing research data,this article expounds the bearing behavior of a single pile mainly form the following two aspects.On the one hand,this paper expounds the load transfer mechanism of a single pile under vertical load.The bearing capacity of piles is mainly composed of pile's side resistance and tip resistance.It analyzes the action of pile's side resistance and tip resistance,and analyzes major factors,which affect the traits of pile's side resistance and tip resistance.On the other hand,it expounds a single pile's horizontal bearing character under horizontal load,and expounds major factors,which affect a single pile's horizontal bearing character.(2)By using the finite element software,this paper analyzes under the influence of the vertical load,the impact of a single pile's bearing character caused by the changes of different factor including the length of the pile,the diameter of the pile,the elastic modulus of the soil,the cohesion,and the internal friction angle in homogeneous soil.(3)Through the analysis of the axial force,the friction resistance and the tip resistance of a single pile,this article clearly shows the traits of the axial force and the friction resistance of a single pile as well as its influence on the bearing capacity of piles.(4)By engineering example,this article compares the theoretical calculation,which includes load transfer improvement method,shear displacement method and simplified calculation of the bridge with numerical simulation and experimental date,and discusses the advantages and disadvantages of various calculation methods and analyzed the value of engineering by using numerical simulation method to simulate the loading experiment of long large-diameter pile.(5)By using the finite element software,to analyze the curve load-displacement gradient and the curve of horizontal displacement's distribution under horizontal load in homogeneous soil,this thesis shows the features of the the large diameter and super long piles under horizontal load.