Finite Element Analysis Of Two-stage Retaining Wall Of "Reinforced Soil-Buttress" Embankment

In recent decades,retaining walls have been widely used in major civil engineering,water conservancy,highway and other construction projects,but the design theory of composite retaining walls has not yet been perfected.In this paper,a two-stage retaining wall of a“reinforced soil-buttress type” embankment in the upper reaches of the Hanjiang River is taken as an example to conduct a two-dimensional and three-dimensional finite element analysis on the retaining wall structure of the project.The specific content and results of the numerical simulation experiment done in this paper are as follows:1.Use the two-dimensional numerical analysis program Rocscience Phase2 to perform plane finite element analysis on the dike retaining wall.The analysis has drawn the following conclusions: the displacement value of the embankment under various working conditions is small,and the displacement law is normal;the stress at the toe of the wall is relatively large,and the principal compressive stress value of the toe of the wall is between 1.1 and 1.5Mpa,the overall stress distribution of the embankment The law is normal;the grid axial force reaches the maximum under the condition of sudden water level drop,and the maximum value is 21.8KN,which is 50 KN lower than the strength of the grid ribs;completion condition,normal condition,design flood condition,and water level drop The overall stability safety factors of the working conditions are 1.99,1.90,1.95,and 1.56 respectively,and the overall stability of the embankment meets the requirements of the specification.2.Use the three-dimensional finite element analysis software ANSYS to perform three-dimensional finite element analysis on the retaining wall of the embankment.The analysis has drawn the following conclusions: the stress and strain distribution of buttress retaining wall panels under various construction conditions is normal;on the inner side of the buttress,the vertical stress is dominated by the compressive stress,and the maximum stress is 1.4KPa,on the outer side of the buttress.Tensile stress will appear,up to 1.0KPa;the overall deformation value of the retaining wall is not large,and the deformation law is normal;the maximum compressive stress of the retaining wall occurs at the lower part of the buttress retaining wall panel,and the maximum tensile stress occurs at the buttress At the connection part of the inclined plane and the bottom plate,the tensile stress value of individual parts has exceeded the design value of the concrete axial tensile strength of 1.43 MPa,which needs to be solved by installing steel bars;under the completion conditions,normal conditions,design flood conditions,and sudden water level drops,The safety factors of anti-sliding stability of the retaining wall base surface were 3.01,2.50,2.86,and 1.91 respectively,which met the stability requirements specified by the code.The research results provide references for the design of the retaining wall structure of the project.