Benefits of finite element method analysis to the design of the Saint Maur Créteil caverns metro station
Benefits of finite element method analysis to the design of the Saint Maur Créteil caverns metro station
The Saint Maur Créteil metro station of the Grand Paris Express is the deepest one in France. It consists of a central shaft and two underground caverns located on either side. The caverns are carried out using NATM method in chalk with high groundwater pore pressure. Due to the dense urban environment, the design of theses caverns has been addressed by a huge finite element method analysis to assess ground surface settlements. The caverns geometries are almost as wide as they are long: this typical geometry requires to be considered to assess the settlements in a relevant way. Comparisons between plane strain modelling using the principle of superposition and the Attewell's formulae, 3D "One step" modelling and full 3D modelling were performed and consistent results were obtained. Other FEM calculations allowed to define the execution procedures to control the groundwater pore pressures dissipation and the hydraulic gradient reduction, with the aim to ensure the lateral abutment stability of the caverns. In these calculations focusing on stability assessment, chalk specific behaviour, intermediate between rock and soil, were accounted for using different constitutive laws.
Martin Cahn; N. Simon; N. H. Nguyen; Sebastien Burlon; E. Talut; J. Subervie
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
D - Current and new construction methods
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