Earth Pressure Of Convex Arc-shaped Retaining Wall Of Fourth-grade Highway In Mountainous Area And Stress Analysis

Retaining walls are common structures of mountain highways due to such advantages as safety,economy,and mature technology.The current designs are based on elastic mechanics plane strain problems,without considering the asymmetrical spatial properties of the retaining wall or earth pressure.Therefore,it is necessary to carry out research on its earth pressure distribution law and structural force characteristics.The research object,research variables and main line of this paper are convex arc-shaped retaining wall,curvature radius R and the slope ? of the bedrock,and earth pressure.The combination of theoretical analysis and ABAQUS numerical simulation is the method.Firstly,the difference between the methods was proved,then the linear retaining wall was compared gradually,immediately,different retaining walls were further analyzed by numerical methods,finally we give preliminary solutions.The conclusions were as follows :(1)The tensile effect of the curved retaining wall is more obvious than the linear one.The wall tensile stress is proportional to the radius R and inversely proportional to the bedrock slope ?.It can reach 1.6 to 2.3 times of the linear retaining wall,which can cause tensile stress damage to some mortar block stone retaining walls;(2)The maximum values of the displacement,earth pressure,compressive stress and shear stress of the curved retaining wall were proportional to the radius R and the slope ? of the bedrock.Among them,the shear stress is significant,and the maximum shear stress at ? ? 0 °can also cause some of the mortar block stone wall to be damaged;(3)The distribution area of the dangerous section of the curved retaining wall is different under different circumstances.For the dangerous area,it is recommended that the mortar block stone retaining wall should be strengthened,and the masonry mortar used when ? = 0 °should not be lower than M7.5,when ? ? 0 °,it should not be lower than M10,and the concrete retaining wall should be strengthened;(5)Aiming at the difference between the space earth pressure and the traditional calculation method,the stress ratio in different situations is initially used as the magnification factor for the cross section check of the retaining wall in the danger zone;The research results in this paper can provide a reference for further research on the stress mechanism of the curved retaining wall under the effect of spatial earth pressure.