Under The Action Of Traffic Load Miniature Pile Reinforced Embankment Slope Dynamic Response Study

With the increasing demand for road smoothness and safety in the transportation industry,the existing disease problems of existing railway embankments are becoming more and more serious.It is imperative to focus on the development of existing line reinforcement technologies under operating conditions.More and more foundation treatments Technology has been applied to the embankment slope reinforcement.As an emerging subgrade reinforcement technology,micro-pile structure has become an important measure for controlling the existing settlement of the embankment slope due to its outstanding advantages.In this paper,the dynamic response of embankment slope reinforced by micro-piles under traffic load is studied.This paper mainly completed the following work:(1)Based on the development history of miniature pile structure,based on a large amount of literature,some researches on the application of miniature pile reinforcement at home and abroad are summarized.The differences and connection between miniature pile technology and traditional pit piles and anti-slide piles are analyzed.The layout and characteristics of micro-pile made a brief introduction.(2)The paper summarizes the working principle of micro-pile strengthening embankment slope,and analyzes the earth pressure distribution and subgrade failure mode.On the basis of some assumptions,the calculation model and simple soil arching calculation model are established based on the working principle of the micro-pile,and the calculation method of micro-pile and soil arching effect between piles are studied.(3)By selecting the typical railway embankment of Yangyuan section of Zhangjiakou in Daqin Railway as the testing area,the traffic load of embankment slope when the train passes through is collected and treated as the input value of traffic load during indoor model test and numerical simulation.Through the model test of embankment slope reinforced by micro-piles,the law of pile-soil pressure and embankment effect between different embankment slopes under different traffic loads are studied.(4)FLAC3D is used to build a three-dimensional model of embankment slope reinforced by micro-piles to study the dynamic propagation of embankment slope and the deformation of embankment under traffic load.At the same time,several working conditions are studied to study the influence of micro-piles on embankment slope deformation According to the simulation results,the force of micro-piles under different working conditions,the soil arching effect between piles and the effect of micro-piles covering are studied.