Numerical Analysis Of Geogrid-reinforced Retaining Wall Based On Improved Duncan-chang Model

Because of the Geogrid-reinforced soil retaining wall’s simplicity of foundationtreatment, adaption to the foundation, attractive appearance and remarkableeconomical benefits advantages, it be used most widely in the geotechnicalengineering. It mainly involves highway, railway, architectural engineering, hydraulicengineering and so on, On theory it mainly for the performance of the work, includingstrength, deformation and stability of three aspects, despite its research have a lot, butthere are still some problems are not well settled in application of geogrid.Based on theory and practice of predecessors, this paper use of the secondarydevelopment language APDL and the macro command of finite element analysissoftware ANSYS to established improved Duncan-Chang model and the numericalanalysis of reinforced retaining wall, through calculation results,this paper obtainedsome useful conclusions, it has guidance and reference for reinforced retaining walltheoretical research and practical engineering.The main work in this paper are followed as:(1) Summarizes the reinforcement technique and reinforced retaining wall’spresent situation and its application at home and abroad, and summarizes thereinforcement the retaining wall’s current design theory and damage of the form andthe future development direction;(2) For geosynthetic materials made a general introduction and mainly illustratesthe grate practicality, discusses the characteristics and its grille between soil andmechanism, function and the modern research of some new ideas;(3) Introduces the finite element software ANSYS composition, characteristicsand functions, and using ANSYS secondary development language APDL and macrocommand established improved Duncan-Chang model, to realize a nonlinearreinforced earth retaining wall separated stiffened calculation model of programming,in addition, the paper also analyzed the finite element calculation of processingmethod, in order to verify the calculation model to analyze the rationality and validity,by listing RMC test wall, the calculated results were compared with the test resultanalysis, a difference of precision accords with a requirement, also provides typicalexamples for similar engineering;(4) According to the results of the model, this paper analyzed the influence operating characteristics and the related parameters and factors, such as:panelstiffness, grille length and space, through commutation this parameter summarizessome useful conclusions;(5) By an engineering example, analyzes without considering the constructionprocess and considering the construction process of adding reinforcement retainingwall deformation and principal stress change based on improved Duncan-Changmodel, it reveals that construction process of contrast found considering results moreactual standards.To sum up, this paper tries to on Duncan-Chang model improvement to study andexplorate reinforced retaining wall numerical, its conclusions also for futurereinforcement of the wall design and application of pioneering laid a foundation.