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Abstract
Abstract：The current analysis on reinforced railway embankment does not take the confinement and friction effects provided by geocell into consideration. To deal with this issue，a new model considering the interaction between the ballast and the geocell was proposed on the base of large-scale direct shear tests. The typical results of embankment behavior from the numerical computation agreed well with those from the laboratory model tests，which confirmed the reliability of the analysis model established. Further systematical analysis on the influence of the ballast strength，geocell stiffness and foundation compressibility on the mechanical response of embankment were carried out. The results showed that the reinforcement made significant influence on the embankment behavior especially near the reinforced layer due to the confinement from geocell. And the effect was spread to the surroundings through the friction provided by geocell and gravel itself and was dissipated gradually. The weaker ballast and softer foundation soil were found to enhance the reinforcement effect on embankment behavior in a greater degree. In the case when the internal friction angle of ballast was 20°and the deformation modulus of foundation soil 5 MPa，the peak lateral displacement was reduced 60% and 72% respectively. The peak stress decreased as well and the distribution range increased markedly due to the reinforcement. The mechanical response of embankment was found to be sensitive to the elastic modulus of geocell in the ranges of 0.2 GPa to 2.5 GPa.
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Received: 28 February 2014
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2015, Vol. 34 
