Research On The Influence Of Slope Sliding On Bridge Pile Foundation And Reinforcement Method

In recent years,the pile foundation disasters of the bridge at the slope section have occurred frequently,and the stress on the pile foundation of the bridge at the slope section is complicated.This article is based on the separation of bridge pile foundation reinforcement engineering in a slope section.It combines existing design specifications and theoretical foundations.The theoretical calculation method is established by simplifying the force of the bridge pile foundation on the slope section.In this paper,indoor model tests and finite element numerical analysis methods are used to analyze the influence of slope sliding on the bridge pile foundation,and the slope prevention and pile foundation reinforcement methods are proposed for the project.The main work and results are as follows:(1)The calculation method and distribution law of slope sliding thrust and soil resistance are analyzed.The simplified mechanical model and differential equation of foundation pile considering the influence of slope are established.The series solution of horizontal displacement and the calculation method of internal force are derived.(2)Through indoor model test,the influence of pile top surcharge on horizontal deformation of pile top and internal force of pile body is analyzed.The results show that,there is a good exponential relationship between the heap load on the top of the slope and the horizontal displacement on the top of the pile,.The influence of pile top surcharge on pile internal force mainly acts on the loaded section of pile.(3)Bridge pile foundation reinforcement project based on concrete slope section.The horizontal displacement and internal force distribution of pile body are analyzed by theoretical calculation and numerical simulation.By changing the pile diameter,elastic modulus and slope,the influence on pile foundation is analyzed.Under the influence of slope slip,the rear pile bears greater internal force.The greater the slope,the more obvious the deformation of pile body.Increasing pile diameter and elastic modulus can effectively restrain the horizontal displacement of pile body.(4)The anti-slide pile support and the supplementary pile foundation method are combined to protect the slope and strengthen the pile foundation.After anti-slide pile support,the safety factor of slope increases from 1.03 to 1.45.The maximum offset of the pile foundation after reinforcement by the supplementary pile foundation method is 0.46 cm,which is less than the 1.22 cm required by the specification.