The Application And Numerical Simulation Analysis Of Pile-wall Composite Retaining Structure In High-fill Slopes

Guizhou Province,with its rugged terrain,is an area with widely developed karst landform in China.Due to the particularity of its landform,it is difficult to avoid the phenomenon of opening mountains and filling valleys in the process of road construction or urban infrastructure construction,and the next problem will be the slope support.There are various types of slope support,retaining wall and anti slide pile are widely used in slope treatment engineering,but they also have different defects,which makes a s ingle support structure type difficult to meet the needs of the project.As a new structure for slope treatment,pile wall composite support and retaining structure integrates the advantages of retaining wall and anti slide pile and is widely used in civil engineering.However,due to the regional differe nces of geotechnical engineering and the complexity of the actual working conditions,the theoretical study of pile wall composite retaining structure lags behind the actual engineering,and its mechanical characteristics and working principle need further study.Based on a high fill slope project in Guizhou Province,this paper studies the pile wall composite retaining structure,puts forward the calculation model of the pile wall composite retaining structure,and carries out the theoretical calculation of the actual project,and finally uses the finite element software to establish the corresponding numerical model for analysis,providing reference for similar engineering cases.The main research contents of this paper are as follows:(1)Compared with pile foundation joist retaining wall,this paper introduces the structural type of pile wall composite retaining structure,puts forward the calculation model,and derives the internal force calculation formula of the structure.(2)Taking the actual project as the background,the paper puts forward the scheme of using single row anti slide piles,gantry piles and pile wall composite retaining as the main sliding section treatment measures,and evaluates the t hree schemes,and finally calculates the internal force of the pile wall composite retaining structure by using the theoretical formula.(3)The finite element software Midas GTS NX is used to establish the numerical model of pile wall composite retaining structure,and the stress of the retaining wall and anti slide pile is compared with the theoretical calculation.(4)The numerical model of single row anti slide piles and gantry piles under the same working condition is established by using the method of control variable.The advantages and dis advantages of single support structure and composite support structure as high fill slope support structure are analyzed from the aspects of stress characteristics,construction technology and project cost.