Study On Action Mechanism And Parameter Optimization Of Prestressed Anchor Cable Anti-slide Pile

The prestressed anchor cable anti-slide pile combined reinforcement system is mainly composed of anchor cable and anti-slide pile.From the ordinary cantilever anti-slide pile to the anchor pile,from the passive force state changes to the active force state,so it can effectively improve the stress state and deformation characteristics of the pile body,and effectively save the project cost.Due to its gradual application in slope treatment projects such as roads and railways,the relevant design methods are still immature,and relevant theoretical research lags behind engineering applications.There are some issues worth discussing especially in terms of load transfer mechanism,pile-soil interaction and influence parameter optimization.The main reinforcement mechanism of prestressed anchor cable anti-slide pile is soil arching effect.Based on indoor model test and numerical simulation software,the evolution mechanism and influencing factors of soil arching effect are revealed.The three-dimensional slope anchor cable pile model is determined.The reasonable value of each design parameter and the sensitivity analysis are of great significance to the design guidance of the prestressed anchor cable anti-slide pile:(1)Indoor model test study of soil arching effectUsing the self-made soil arching effect test model box,the digital photographic deformation measurement test,the influencing factors of the soil arch bearing capacity(baffle spacing,compactness)test,and the internal stress redistribution test of the soil arch were carried out.The bearing mechanism and mechanical properties of soil arching are revealed.(2)Analysis of influencing factors of reinforcement mechanism of prestressed anchor cableanti-slide pileUsing the numerical calculation software PFC to establish the horizontal section soil arching effect particle flow model and the vertical section prestressed anchor cable anti-slide pile numerical calculation model,monitoring the evolution process of soil arching effect influenced by factors such as pile spacing,pile width and soil particle properties.Exploring the influence of soil particle friction coefficient and anchor cable anchoring position on the stress and deformation characteristics of anchor piles.(3)Numerical simulation study on parameters optimization of anti-slide piles with prestressed anchor cablesThe 3D numerical simulation model of landslide soil and prestressed anchor cable anti-slide pile is established by using FLAC3 D combined with actual engineering.The soil properties,pile width ratio and anchor cable laying position are used to analyze the soil reinforcement effect and the deformation of piles.The relationship of relevant design parameters between the stability of the soil and the bearing capacity of the anti-slide piles are established,so as to optimize the design parameters.Based on this,orthogonal experiments are designed to analyze the sensitivity of the main control factors.