Study Of Seismic Behaviors And Seismic Deformations Of Geo-grid Reinforced Retaining Walls Under Earthquake

With the geogrid reinforced soil retaining wall in the engineering application more andmore, it becomes important to its performance research also gradually, the deformation ofthe retaining wall control is to ensure that the wall of the important methods for safety.Thispaper mainly studies three aspects of the problem,The main research work achievements ofthis dissertation are as follows:The first considering the effects of liquefaction degree of seismic deformationcharacteristics of geogrid reinforced retaining wall large shaking table test.Geo-gridreinforced retaining wall is a flexible retaining structure, and at present, there is no strictanalysis theory and design method of this reinforcement structure, and the reinforcementmechanism of seismic behavior is unclear, and there is no reasonable standard for seismicdesign. A non-linear finite difference method which is based on Lagrange method wasapplied to analyze seismic behaviors of geo-grid reinforced retaining wall with integralpanel under different design parameters. The elastic-plastic model is simulated to backfillsoil and foundation, and the coupled elastic parameters are used to describe the interactionof soil and geo-grid. The design parameters include geo-grid reinforcement spacing,reinforcement length, geo-grid distribution form, geo-grid reinforcement stiffness,earthquake intensity, backfill soil stiffness, and unit weight and thickness of panel and so on.The study was focused on the seismic residual deformation of the reinforced retaining walland internal reinforcement force. Some conclusions were achieved such as the distributionregulations of seismic residual deformation of reinforced wall and coupled shear stress ofgeo-grid reinforcement, some sensitive parameters to seismic behaviors of the reinforcedretaining wall and so on, which will be helpful to the seismic design of geo-grid reinforcedsoil retaining wall with integral panel.The dynamic behavior and the seismic resistance mechanism of the geo-gridreinforced soil retaining wall at present have not been clear. The laminar shear containerwas used to install the test model of the geo-grid reinforced soil retaining wall, its seismicbehaviors ware investigated by a large-scale shaking table test. The similarity criterion ofthe test model was confirmed by Froude constant of π theorem in dimensional analysistheory. Considering the near-fault and far-field ground motions, the SP far-field wave, theSF near-fault wave during Wenchuan earthquake and Taft mid-far-field wave were applied to test the seismic behaviors of the geo-grid reinforced soil retaining wall, which include thewall accelerations, the accelerations of the backfill sand, the horizontal displacements of thewall, the seismic subsidence of the backfill surface of reinforced zone and unreinforcedzone, and the excess static pore water pressure in backfill soil and geo-grid strain.The study considered earthquake geogrid reinforced soil retaining wall under the actionof the residual deformation of simplified theoretical calculation method for the study. In thispaper, the reinforced soil retaining wall as a binder for consideration by the gravity retainingwall reinforced soil retaining wall as the elastic cantilever beam of the opposite sex, wallback triangle under the effect of lateral earth pressure and horizontal displacement.According to the Rayleigh ritz method is deduced under the action of the static calculationmethod of horizontal displacement of reinforced soil retaining wall is derived on this basis,according to the pseudo-static method under dynamic action and the level of the reinforcedsoil retaining wall under the influence of the degree of liquefaction deformation theorycalculation method.