Research And Numerical Analysis On Earth Pressure Of Geogrid Reinforced Retaining Wall

In engineering practice,the research on the performance of reinforced soil retaining wall is a very important topic,which involves reinforcement mechanism,stability(internal/external),deformation(mainly refers to the horizontal deformation of the panel,the settlement displacement of the top of the wall,etc.),material strength,wall properties and evaluation of reinforcement effect.The finite element numerical analysis method is an effective method to simulate the working mechanism of the reinforced soil retaining wall and analyze its mechanical stability,which can make up for the deficiency of the limit equilibrium method,and is more consistent with the actual engineering in terms of earth pressure and deformation.Based on the finite element numerical simulation method to establish numerical model with the actual engineering to contrast,show that the modeling and analysis methods of the reliability and validity,this article mainly involving the use of Plaxis software and the rationality of the model validation,geogrid reinforced earth wall characteristic and soil pressure of the development research and deduces the formula of soil pressure and verify the three aspects of research,The main contents are:(1)In the numerical simulation calculation,there are many modeling methods for the treatment of reinforced retaining wall.In this paper,the supporting retaining wall model and the reinforced retaining wall model are established respectively,and the numerical simulation data and the measured data of the lateral earth pressure and plastic deformation of the reinforced retaining wall are analyzed and compared.At the same time,the earth pressure of retaining wall,lateral earth pressure of reinforced retaining wall,plastic deformation,toe load and the difference between the actual engineering are compared and analyzed.Based on the analysis and comparison of different specific values and measured data,the paper draws a conclusion that the finite element numerical simulation method is more reasonable and conforms to the actual engineering.These three sections fully prove the reliability of PLAXIS software,and prove the rationality of the model construction,mesh division,boundary conditions,soil model and material parameters in Chapter 3 and Chapter 4 of this topic.(2)The distribution law and calculation method of earth pressure has always been a difficult problem in the research of reinforced retaining wall.Through numerical simulation,the influence law of different reinforcement ratio(number of reinforcement layers)and reinforcement stiffness on active earth pressure of geogrid reinforced earth retaining wall structure is analyzed.The results show that the earth pressure of the retaining wall is affected by both the number of geogrid reinforcement layers and geogrid stiffness,and the change of earth pressure caused by the surface load is reflected in the top layer.(3)Based on the dynamic play of internal friction Angle,a calculation method of earth pressure under non-limit state is proposed,and the corresponding calculationmodel is established.Based on the effect of internal and external friction angles,the empirical formula for calculating earth pressure is improved,and the improved formula is compared and verified.The calculated results of non-limit state obtained by using the improved empirical formula are consistent with the measured results,which verifies the rationality of the improved formula.