Study On Stability And Deformation Characteristics Of Railway Embankment Loess Slopes Reinforced With Geogrids

The natural and artificial slopes are extremely important and the most common geological environment in the human lives and practice activities. As the train speed high and dynamic effect large, so the railway has high requirements of the subgrade slope stability. But in this stage, the slope deformation problems are particularly important at the premise of ensuring the stability.It is a new type of composite civil engineering structure system that the slopes reinforced with geogrids. Grille can enhance the overall rigidity, constraints soil lateral deformation, and with low cost, easy construction, conservation of land and the characteristics of flexible structures characteristics, can be widely applied to the highway, railway, architectural engineering, hydraulic engineering and so on.This paper adopts the method of geogrid reinforced slope, through the finite element analysis, studies the railway embankment slope stability and deformation characteristics. During the finite element analysis of reinforced slope, simulate it by using the existing engineering simulation software FLAC3D. On the above issue, the main subject of this thesis is as follows:(1) With the study of plenty of interrelated references, this article summarizes the research of reinforced earth works, and introduces briefly the geogrid classification, characteristics and the actuality and developing level, then reviews the research situation of geogrid that used in railway track slope.(2) Using numerical analysis software FLAC3D and accordance with the plane strain problems, establish 3-D Mol-coulomb constitutive model, then analyses two different soil loess and soft.(3) According to the slope by loess composition, by changing geosynthetic materials of reinforced slope reinforcement parameters in loess slope, including length and spacing, finite element analysis, comparative reinforcement of loess slope deformation with before, got loess slope deformation characteristics and the effect on the stability of the laws, and concluded that while the grille unit of length is 2.0 meters, the vertical distance of 0.7m, the soil and the stress of the grille can achieve greater safety coefficient and the smaller the slope deformation, it is a more good reinforcement method for loess slope reinforcement.(4) Will the better reinforced ways that the loess slope got applies in soaking roadbed slope to verify the way that can improve soaking roadbed slope stability and reduce the deformation of soaking roadbed slope through the analysis of soaking roadbed slope reinforcement. but its reinforcement effect is weaker than loess slope. (5) Reinforced functions of geogrid are mainly played by its tensile stress, The stress state of geogrids which have different positions and lengths are analyzed, obtained excellent reinforced way, thus guidance in the design and construction of reinforced embankment can be supplied and both the reinforcement effect and the economic interests can best satisfied.