Transmission of underground-induced vibration to the ground surface: a comparison of 2D, 2.5D and 3D models
Tuesday 2 june, 2015, 14:20 - 14:40
0.1 London (90)
The propagation of vibrations from surface or underground excitations due to tramways or trains is well described by FEM/BEM approaches where the different media can be modelled either by FEM or BEM. The MEFISSTO software developed at CSTB over the last 20 years exists in 2D, 2.5D and 3D versions. While certain configurations such as pile foundations must be handled with a 3D model, many situations, such as trains in tunnels, are well described by a 2.5D approach. In this paper, the effects of 2D versus 2.5D and 2.5D versus 3D is assessed in several applications. In many situations, 2.5D models come as a necessity over 2D models and can be showed to be also valid for structures of moderate length. The case of a tunnel imbedded in multi-layer soils is presented as a practical application.
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