Influence Of Lateral Displacement Of Soil On Vertical Bearing Capacity Of Pipe Pile

Due to the excellent properties of precast concrete pipe pile,precast concrete pipe pile has been wide used in engineering.At the beginning of the design,pipe piles are mainly aim to bear vertical load,and the horizontal bearing capacity is relatively weak.Recently,damage cases of pipe pile have great increase in the condition of lateral soil movement,In order to prevent the occurrence of building disease,and improve the safety and applicability of pipe pile in the soil under the lateral movement.This topic carry out a simulation analysis of the single pile and pile group by mean of indoor model test in the condition of lateral soil movement,the result are as follow :At first,the essay discusses the related research of experts and scholars,and this topic research method and test model is put forward on the basis of summarizing the related research.In this paper,an indoor model test is conducted to analyze the pile vertical bearing performance.The effects of different soil loading positions,soil lateral loading and other variables on the vertical bearing capacity of pipe pile are discussed,the study shows:(1)The lateral displacement of the soil has accelerated the settlement speed of the pile foundation but has no steep deformation and damage.It has the effect of compacting the soil and destroying the soil structure;(2)When the top of the pile has a large vertical load,the single pile will suddenly damage,and loss of vertical bearing capacity in the condition of lateral soil movement,,when both the load is small,the impact of soil lateral shift is not on;(3)When the lateral load loading point of the soil is small,the vertical bearing capacity of the pile foundation is improved slightly,which indicates that the soil compaction effect is larger than that of the plastic.Then,Simulation of single pile with FLAC3 D numerical simulation software is conducted,the paper discusses the relationship between the size of the soil displacement,inter diameter of pipe pile,the pile load and the lateral movment depth of the soil.The pile body bending force,the pile body axial force and the negative friction resistance are analyzed,andit is considered that the pipe pile under the soil lateral displacement condition has negative friction resistance,and the tensile strength design of the pile should be strengthened.For the pipe pile which allow little lateral displacement,should be strictly controlled with soil lateral migration depth.Finally,the influence of soil lateral displacement,soil lateral displacement model,soil lateral displacement loading position and pile rigidity on bearing capacity of pile is mainly discussed.The results show that under the condition of lateral displacement of the soil,the pile in the front row is floating,the pile is pulled,the pile in the back row is sank and the pressure of the pile is increased.The displacement and trend of each pile are basically the same.The pile foundation has the vertical load to increase the bending moment of each pile,and the bearing behavior of each pile should be analyzed in detail.