Study On The Mechanical Characteristics Of Double-row Pile-anchor Cable Structure

Since the reform and opening up,China’s urbanization construction scale and development speed can be called the highest in human history.In the construction of mountain towns,affected by the complex topography and geomorphology,it is inevitable to cut mountains and cut slopes,which destroys the original balance of the slope and poses a safety hazard.This paper is based on the slope project of Huaqiao Middle School in Pingnan County.The maximum slope height is more than 20 meters,The mechanical properties of rock and soil are weak,and the surrounding geological environment is complicated.In order to ensure the safety of Huaqiao Middle School at the top of the slope,we use two rows of cable cars on the anchor rods to support the slope...This support form gives full play to the bending resistance of the pile and the ability of the anchor cable to control the deformation of the pile,protecting the existing facilities and facilitating the construction of the proposed site at the slope toe.However,the current research on double-row pile-anchor support is not deep enough,and the design method is not yet mature,this article will study its force characteristics,working characteristics.The work and results are as follows:(1)Summarized the theoretical research results of pile-anchor support and double-row piles and the characteristics and scope of application of the commonly used calculation models of the two types of support are analyzed in detail.(2)In combination with engineering examples,the elastic method is used for calculation.In addition to the soil springs in the passive zone,a connection spring between the piles is introduced between the front and rear rows of piles.After comparing with the monitoring data,the result of the calculation model is reasonable and the deformation meets the requirements of the specification.(3)The finite element method is used to analyze the stress and strain characteristics of the slope and the force characteristics of the double-row piles.The internal force and deformation laws obtained by the two methods are similar,which together reflect that the rear-row piles are more important in the system.The important force-bearing parts,bending moment and shear force are greater than the front row piles.(4)The influence law of pile length,pile diameter and other parameters on the structural support performance and the role of anchor cables in the supporting system are analyzed,and the design optimization ideas for this type of structure are initially discussed.