Parameter Inversion And Stability Analysis Of Retaining Wall With Steel-Plastic Composite Stretch Belt-Modular Panel

Reinforced soil retaining wall technology because of its small footprint,simple construction,low cost,structural coordination and deformation ability,beautiful shape and many other advantages at home and abroad have been rapid great development.Reinforced technology in China has thousands of years of history,the latest Several decades of domestic construction of a large number of reinforced earth retaining walls.However,due to the complexity of the force system,the reinforced earth retaining wall is often deformed and damaged in different degrees after 3 to 5 years,and further deformation can lead to the instability of the retaining wall.At present,the theoretical research on the reinforced earth retaining wall is far behind engineering practice.It is well known that the reinforced earth retaining wall is composed of three parts:panel system,reinforcement and fill,but the work of the reinforced earth retaining wall Mechanism and interaction are not clear at present,especially for the service period reinforced earth retaining wall,its stability evaluation is no clear standard,deformation prediction research is also less.Based on the field deformation monitoring data of a reinforced earth retaining wall project,this paper establishes a service evaluation system of reinforced earth retaining wall with technical means such as indoor soil test and finite element numerical calculation.The key mechanical parameters which influence the deformation and stability of reinforced soil during service life are analyzed by laboratory test,reinforcement test and finite element numerical calculation.The PSO-LSSVM model is applied to the inversion of the key parameters of the reinforced earth retaining wall.Finally,the solution to the deformation prediction of reinforced earth retaining wall in service period is given.Through the analysis and finishing of the monitoring data of the reinforced earth retaining wall,the field core and the related indoor test and the inverse analysis based on the displacement,the main conclusions are as follows:(1)The soil moisture content of the reinforced soil retaining wall at different deformation levels is quite different,and the water content is higher at the lateral deformation.(2)For the reinforced soil retaining wall,the main factors affecting the lateral deformation are the friction angle cp and the axial stiffness Ej of the filler,and the friction angle of the filling soil after the water content of the filling reaches the equilibrium moisture content can be considered stable,reinforced soil retaining wall on the basis of this further deformation is mainly affected by the creep of the impact.(3)For the service-reinforced soil retaining wall,the steady state can be evaluated by the lateral displacement/wall height and the strip strain.The lateral displacement/wall height can be obtained by field monitoring.The dependent variable can be calculated by finite element method and compared with the relevant design index.(4)The general back analysis model of PSO-LSSVM is applied to the back analysis of reinforced earth retaining wall,and good results can be obtained.The deformation prediction value based on inversion parameter agrees well with the measured results of field measurement,and has some engineering reference value.