Analysis Of Working Mechanism And Lateral Loading Capacity Of Driven Steel Pipe Pile

As the terminal gradually develops into deep hydration,the frequency of use of high-pile wharf is increasing,and the steel pipe pile is favored in the pile foundation application of high-pile wharf due to its high rigidity and strong bending resistance.During the penetration process,the driven steel pipe pile will interact with the pile side soil,causing different degrees of disturbance and remodeling of the pile side soil,and then the pile end soil is filled with the pile end soil and forms the soil core.The pile side soil is compacted by being squeezed,and the compacting effect formed by both of them enhances the bearing capacity of the pile foundation.At present,no scholars have made a comprehensive study on the bearing mechanism of the driven piles and conducted quantitative analysis.Most of the research focused on the penetration simulation of solid piles,and when using dynamic response to simulate the dynamic process of piles,the soil grid is involved.The deformation caused the model calculation to be interrupted.This paper relies on the on-site horizontal static load test of the coal terminal project of the first phase of Vinh Tan 1 BOT Coal-Fired Power Plant Project.Firstly,the on-site horizontal static load test was carried out on the driven steel pipe piles used in the terminal.On the basis of the experiment,based on the ABAQUS finite element software,this paper firstly tried to use the pre-treatment method to change the soil stress of the pile side by applying horizontal displacement load on the pile side soil,and equivalently simulate the pile-side soil state of the driven steel pipe pile,and established The finite element calculation model of the driven steel pipe pile is used to analyze the horizontal bearing capacity and displacement.After comparison with the static load test results,the agreement is good,indicating the reliability of the established mathematical model.Secondly,this paper uses ABAQUS finite element software to analyze the working mechanism of the piles and soils.Because the stiffness of the pile side soil is much smaller than that of the steel pipe piles,the pile body under the horizontal load has not reached the ultimate bearing state.The plastic uplift occurred in the lateral soil.Subsequently,according to the domestic standard requirements for the horizontal displacement of high-pile wharf,this paper optimizes the selection of the actual diameter of the pile,summarizes the influence of the pile diameter on the horizontal bearing capacity,and provides the diameter of the pile.The scope of optimization is made to make it more safe and reliable.Finally,the article discusses the influence of pile length and soil parameters on the horizontal bearing capacity of engineering piles,and provides reference for the design of the same type of actual engineering.The results show that:1)The simulation results of the pre-displacement load equivalent method are in good agreement with the actual situation,which can effectively simulate the soil stress generated by the surrounding soil after extrusion and serve as the initial stress in the next stage.2)The deformation form of steel pipe pile under horizontal load is intermediate between medium and long pile and rigid pile.In the case where the pile depth is small,the deformation characteristics of the rigid pile are easily generated,and the pile side soil is subjected to the extrusion plastic uplift.3)The main factor affecting the horizontal deformation of steel pipe piles is the characteristics of the steel pipe pile itself,that is,the diameter,the soil parameters have little effect on the deformation characteristics,and weaken with the increase of the soil depth.