Three-Dimensional Back-Analysis of an Instrumented Shallow Tunnel Excavated by a Conventional Method |
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| Authors: | Mohamed Nabil Houhou Fabrice Emeriault Émilie Vanoudheusden |
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| Institution: | 1.MN2I2S Lab, Department of Civil Engineering and Hydraulic,Mohamed Khider University,Biskra,Algeria;2.CNRS UMR 5521, 3SR Lab,Grenoble-INP, UJF-Grenoble 1,Grenoble,France;3.Arcadis ESG,Paris, Toulouse,France |
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| Abstract: | The excavation of a shallow tunnel induces deformations of the soil volume in the vicinity and above the tunnel and consequently on the nearby buildings. The range of these deformations depends among other on the geological conditions, the geometry of the tunnel, and the excavation method. In this context, this research focuses on the 3D numerical modeling of a shallow tunnel instrumented during its construction, located on the Toulouse (France) subway line B for which the excavation has been carried out in a conventional manner in an over consolidated molassic geological context. The objective of this analysis is to estimate the tunnel behavior in terms of vertical and horizontal movements of the surrounding soil and the deformations of the existing buildings. The explicit finite differences numerical code FLAC3D is used to model the various implementation phases of the work where the fluid–soil interaction is taken into account through an undrained coupled analysis. The results of this 3D model are compared to those of the in situ measurements in order to validate the geotechnical characteristics of the molasses. The latter are a useful basis for the back-analysis of the different monitoring sections implemented in areas where the tunnel excavation is made by TBM with pressurized front. |
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