Internal Stability Analysis Of Reinforced Retaining Wall Under Earthquake Load

Reinforced retaining wall is a novel supporting structure,which is simple structure,low cost and good soil retaining performance,at the same time,it has good seismic performance under the action of seismic load,therefore,the reinforced retaining wall is used in the construction of highways in China,it has been widely used in railway construction and urban construction,however,its anti-seismic mechanism and design method are still not perfect.In this paper,the internal stability of reinforced retaining wall under earthquake is studied,the specific content and results are as follows.(1)The reinforced soil is used as a composite material and the bar strip are used as soil reinforcement,this paper based on the horizontal strip method,the force balance equations of the reinforcement strips of the reinforced retaining wall under earthquake are established,and the calculation formulas of the tensile forces of the reinforcement bar strip are deduced,the calculation formula for the required anchorage length of the bar strip,the program for the calculation of the most dangerous folding surface and the maximum tensile force of the bar strip using the program written by MATALAB software;finally,an engineering example is analyzed,the finite element software numerical simulation software ABAQUS is used to verify the calculation formula of the bar strip tension based on the horizontal strip method proposed in this paper.The results show that the calculation method presented in this paper can accurately reflect the actual stress of the bar strip and ensure the safety of the reinforced retaining walls under seismic action.(2)Using MATALAB's own genetic algorithm toolbox,write a program to iteratively solve the maximum tensile force and the corresponding most dangerous sliding surface of the bar strip,then,the factors affecting the internal stability of the reinforced retaining wall,such as the wall backfill density,cohesive force,internal friction angle,wall height,horizontal and vertical seismic acceleration were analyzed.It is concluded that as the internal friction angle of the backfill increases,the normalized coefficient of the tensile strength of the bar strip decreases,and with the increase of the backfill of the wall,the normalized coefficient of the tensile force of the bar strip increases,and the effect of the horizontal earthquake on the internal stability is more obvious than that of the vertical earthquake,as the height of the wall increases,the normalized coefficient of the tensile force of the bar strip increases.(3)The internal stability of the reinforced retaining wall under earthquake is analyzed by the finite element numerical simulation software,the three-dimensional solid element is adopted for the panel and filling,and the three-dimensional shell element is used for the bar strip,the contact type used between the models adopts the surface contact,bar strip are embedded in the panel,the distribution of the maximum tensile force of the reinforced retaining wall before and after the earthquake and the variation of the tensile force along the vertical direction of the wall are obtained,the following conclusions can be drawn from the numerical simulation,the axial force of the bar strip of the reinforced retaining wall will increase under the action of the earthquake,and the axial force of the bar strip increases with the height of the wall decrease,the deformation of the soil is large near the panel,and the deformation of the soil will affect the soil in a certain range of the foundation,since the tensile force of the bar strip decreases as the wall height increases,the maximum displacement of the panel occurs at 1/3 height of wall.