Study On The Load-bearing Mechanism And Influencing Factors Of Reinforced Earth Retaining Walls With Arch Panels

Reinforced soil retaining walls,as a lightweight retaining structure,have been widely used in transportation,water conservancy and other engineering fields due to their strong adaptability and low cost.However,after investigation and research,it has been found that reinforced soil retaining walls often experience damage such as rib detachment and bulging after being built for several years,seriously affecting their normal use.In view of the shortcomings of the existing reinforced earth retaining wall panels in terms of deformation resistance,based on the stress characteristics of the arch structure,this thesis proposes a new type of reinforced earth retaining wall structure that sets the wall surface as an arch,namely,the multi arch panel reinforced earth retaining wall.The panel is arch,and the earth pressure behind the panel is transmitted to the column through the arch panel to reduce the tensile force of the reinforcement and enhance the structural stability of the reinforced earth retaining wall.Due to the fact that the reinforced earth retaining wall with arch shaped panels is a new type of retaining structure,its stress mechanism and influencing factors are still issues that need to be studied.Therefore,this article conducts theoretical analysis and FLAC^3Dnumerical simulation to study the mechanism and mechanical characteristics of reinforced earth retaining walls with arched panels.It compares and analyzes the displacement,lateral soil pressure,column plate contact surface and reinforcement stress distribution of arched panels and reinforced earth retaining walls with different spans,heights,and heights,providing theoretical reference for the design and engineering application of reinforced earth retaining walls with arched panels.The specific research content and conclusions are as follows:（1）Research and analysis on the current theory of reinforced soil,combined with current theories and specifications,proposed the construction of a reinforced soil retaining wall with a continuous arch panel,and established relevant calculation models.（2）Simulate and analyze the stress characteristics of reinforced soil retaining walls with different panel types using FLAC^3D.The results show that the reinforced earth retaining wall with a continuous arch panel can significantly reduce the deformation of the retaining wall and the tensile force of the reinforcement compared to a flat plate,fully leveraging the advantages of concrete arch panels,making the entire arch panel compressed and preventing the panel from being damaged due to bending and tensile deformation.（3）The influence of arch span L and sagittal height f on the working performance of reinforced soil retaining walls with multi arch panels was analyzed using FLAC3D simulation.The results show that the working performance of the reinforced soil retaining wall with continuous arch panel increases with the decrease of arch span L and the increase of rise height f.There is an optimal rise to span ratio to ensure that the arch reinforced soil retaining wall meets both performance and economic requirements.When the height of the retaining wall is 10m,the optimal span L is 6m,and the optimal rise to span ratio is 0.24.（4）Analyzed the stress and deformation characteristics of numerical models for reinforced soil retaining walls with multiple arch panels of different heights.As the height of the retaining wall H increases,its maximum lateral displacement and lateral soil pressure vary linearly within a certain height range.Beyond a certain height,the lateral displacement of the retaining wall will increase nonlinearly.（5）Analyzed the variation law of anchor rod tension under different retaining wall heights.The results show that when the height of the retaining wall is less than 7.5m,the tensile force of the anchor rod reaches its maximum at the top of the wall and gradually decreases vertically;When the height of the retaining wall is greater than7.5m,the maximum tensile force of the anchor rod is located in the middle and lower parts of the wall,and it is distributed in a"V-shaped"or"trapezoidal"shape along the wall.（6）Based on the numerical simulation results and the existing design theory of reinforced soil retaining walls,a design method for multi arch panels is proposed,and a structural design and calculation method for arch panels,columns,and anchor rods is proposed.