Numerical Simulation Of The Mechanism Of Sideslip Deformation Of High Fill Embankment On Soft Subgrade

In recent years,the sliding deformation of the embankment built in soft soil area evolved gradually into a prominent problem,which seriously threatened the overall stability of the embankment.There have been many major engineering accidents of landslide instability in the roadbed.There is an urgent need to strengthen the soft foundation Systematic Study on Failure Mechanism of Sideslope in Fill Embankment.This paper mainly relies on the engineering practice of the soft soil foundation embankment of typical engineering geological sections in the Pukou interchange area southeast of Fuzhou Ring Expressway.Three-dimensional numerical simulation software PLAXIS 3D was used to simulate the actual construction process and operation process of embankment fill.In this paper,the embankment fill the area under the reinforcement pile from left to right is divided into embankment slope foot area,the embankment slope area 1,the embankment slope area 2,left the road area,the pavement center area,through the activation of different sub-district to achieve Then,the anti-sliding mechanism of the piles sliding on the side of the embankment is studied under the condition of different piles by activating all the piles.Then,the deformation characteristics of embankment slope and the co-deformation law of pile and soil under traffic load are analyzed.Finally,the actual working conditions of embankment with soft ground for three typical engineering geological sections are simulated and analyzed Deformation and destruction characteristics and stability.The main research results of this paper are as follows:(1)Partition piles under the conditions of only the bottom of the embankment at the bottom of the pile group under the action of the smallest soil deformation and effectively prevent the formation of sliding through surface,can better control the embankment sliding deformation,the pile group is to control the embankment Slipping of the key group.(2)Under the condition of global piling,the strain-penetrating area of soil mass is effectively blocked,and the soil deformation is also significantly controlled.The deformation of the pile is closely related to the deformation of the soil,and the deformation of the pile is basically neglected.In the early stage of filling,there is a right bending deformation of the pile on the right,and after reaching a certain filling height,all the piles show a tendency of bending to the left.The deformation of the pile located in the area with the largest soil deformation is the largest.The pile group located in this area plays a major role in preventing the side-slip of the embankment through its own deformation.(3)The different driving modes have obvious influence on the subgrade deformation,the total displacement under the full load>the left load The total displacement under action>the total displacement under the action of the right-side load;the destructiveness under the full-range load when the embankment is destroyed by overloading>the destructiveness under the left-side load>the destructiveness under the right-side load;(4)According to the relative displacement of pile and soil and pile stress and pile resistance mechanism of pile foundations in the foundation pile foundation area from left to right into push-pull area,push-cut area,bending shear zone,shear zone,Bending shear zone.