Study On Reinforcement Mechanism And Parameter Optimization Of Pressure-dispersed Anchor Retaining Wall

With the rapid development of our country's economy and society,it has become an inevitable requirement to speed up the construction of the highway.Pressure-dispersed anchor retaining walls are increasingly used in highway large slope management projects because of their outstanding advantages of reasonable structure,convenient construction and economical use of land.These kinds of joint reinforcement structures provide lateral restraints by applying multiple anchor plates at the same height.They can not only improve the prestress of the bolt but also increase the design height of the abamurus.Pressure-dispersed anchor retaining wall has both the superiorities of thin-walled retaining wall and anchored bulkhead retaining wall.As a new kind of support structure,its relevant theoretical research is scanty,especially in the mechanism of interaction between retaining wall and soil behind wall,structure of load transfer behavior and influence factors of structural stability.This also limits the further development of this kind of reinforcement structure.Based on the previous research results,the strengthening mechanism of pressure-dispersed anchor retaining wall in slope engineering is numerically simulated by using discrete element software.This paper also reveals the influence of number of anchors,location of anchors,size of anchor plates,number of anchor plates,spacing between anchor plates,height of retaining walls and filling material parameters to stability of retaining wall through numerical simulation.The visualization model experiment is carried out to study the anchor group effect of soil slope reinforcement engineering with pressure diffusion anchor.The concrete research content is as follows:?1?Numerical simulation research on reinforcement mechanism of pressure-dispersed anchor retaining wallBased on the theory of discrete element theory and PFC^2D program,the model of the slope's stability with no reinforcement and the reinforced slope's stability was built to monitor mesoscopic physics and mechanics parameters of each part of the model after applying overlying load.The interaction mechanism of retaining wall and soil in back side and the load transfer mechanism of post-pile soil under overburden was analyzed to explore pressure-dispersed anchor retaining wall's reinforcement mechanism.?2?Numerical simulation research on influencing factors of pressure-dispersed anchor retaining wall stabilityConsidering the factors such as the number of anchors,location of anchors,size of anchor plates,number of anchor plates,spacing between anchor plates,height of retaining walls and filling material parameters,different numerical models were established by using PFC^2D program to simulate and analyze the influence of different factors on pressure-dispersed anchor retaining wall stability.Then carry out optimization analysis of related parameters.?3?Visualization model experiment on anchor group effect of soil slope reinforcement engineeringVisualization model experiment was designed to explore the anchor group effect in numerical simulation test.The deformation mechanism of surrounding sand around the anchor,the mechanical properties and influence factors of anchor group effect was analyzed and studied by using pull-out test,digital photogrammetry and image correlation analysis.