Study On High Embankment Reinforced Soil Retaining Wall Mechanical Properties As Well As Design And Optimization

Since the reinforced earth retaining wall technology was introduced into China since seventy’s,this technology has been widely used in the domestic highway,railways,airports,water conservancy and hydropower and other fields.In recent years,With the further increase of the economic construction of our country and the rapid development of the domestic large-scale infrastructure construction,there have been a large number of high embankment in the construction field of airports,railways and roads.If continue to use the traditional pile type retaining wall,gravity retaining wall,etc.,not only will the amount of masonry projects,the difficulty of construction increase,but the cost of inputs will also be huge.To save costs,reduce the difficulty of construction,shorten the construction period and reduce the occupation of land,as well as to solve the stability problem of high Slope.So the tall reinforced soil retaining wall which has good structural properties,the distributed wall stress and easy to control deformation have gradually being taken seriously.Currently,domestic and foreign scholars has done a lot of numerical simulation,experimental research and theoretical analysis to single embankment reinforced soil retaining wall,structural characteristics and properties has been quite understood,at the same time a relatively complete theory and design method has been established.Moreover,the domestic existing design guidelines for reinforced soil wall height is only limited to a relatively low embankment reinforced soil retaining wall,for the steps of the high embankment reinforced soil retaining wall of the research is very rare,and no clear specification of how to design the stepped embankment reinforced earth retaining wall,the width of retaining wall embankment platform and the height of the step design is mostly random.Project operating procedure may appear larger deformation,panel fall off,difficult to coordinate between soil deformation ribs,which causing the structure itself can not function well played.And by the deformation mechanism and the work performance and lack of in-depth understanding of their structural system,affecting the application of the structure.In summary,the study of the stepped reinforced soil retaining walls and structural characteristics of the design parameters have great significance.Currently,research methods reinforced soil retaining wall are mainly in-situ measurement,laboratory model test and finite element numerical simulation.Among them,the model test costs are very high,monitoring period is very long and vulnerable to outside interference conditions.In this case,the finite element method numerical simulation has become an effective way of effective mechanical characteristics of reinforced soil and its design optimization.In this paper,the mechanical properties of reinforced earth retaining wall in high embankment have been in-depth analyzed and discussed via the finite element numerical simulation method,revealing the working principle.And further analysis of its structure on the basis of design parameters and optimize the structure of the system.The main work has done as follows:(1)Review the main application and the current domestic and international research reinforced soil retaining wall,we analyze the main problems of reinforced earth retaining wall in the promotion and application;(2)Deeply discussed the interaction with the characteristics of reinforced soil retaining wall reinforcement and filling material between the reinforcement features,and design methods at home and abroad about the embankment reinforced soil retaining walls;analysis the value of the number of times finite element analysis involved in two types of plane problems,finite element analysis,and numerical analysis software associated with the selected material model structural unit conducted a comprehensive and systematic introduction;(3)Use the finite element software PLAXIS geotechnical engineering,with a total height of 18 m two-stage embankment reinforced earth retaining wall for the study,in-depth analysis of the mechanical properties and grasp the stress distribution of deformation.The calculations shows: the horizontal soil pressure of retaining wall,high levels of deformation along the wall were "nonlinear" distribution;rib belt deformation amount is far less than its allowable strain;the impact of the height of the retaining wall backfill slope was obvious;(4)At the basis of mastering the mechanical properties of the retaining wall,further analysis of the structure of its design parameters shows: Integral panel is superior to the module assembled panel and return package type panel;In the choice of filler,good quality grading and packing friction characteristics between the tendon and should be selected which internal friction angle should not be less than 35 °;bar strip spacing should be controlled within the range of 0.4-0.5m;on the lower steps of the width should be no less than 2m;,Using multistage type steps,single-stage height should not exceed 8m,fill slope should not exceed 5m meters are recommended when design retaining wall;(5)Summarize full text of the related research work and point out the deficiencies existed this paper as well as the future need for further research direction and content.Through the research work above,wish it will provide a useful reference for future development and improvement of tall reinforced soil retaining wall engineering design,applications,and related specifications.