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Geotechnical and Geological Engineering

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23.05.2016 | Original paper

Three-Dimensional Back-Analysis of an Instrumented Shallow Tunnel Excavated by a Conventional Method

verfasst von: Mohamed Nabil Houhou, Fabrice Emeriault, Émilie Vanoudheusden

Erschienen in: Geotechnical and Geological Engineering | Ausgabe 4/2016

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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 FLAC^3D 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.

Vorheriger Artikel Structure Optimization for the Support System in Soft Rock Tunnel Based on Numerical Analysis and Field Monitoring

Nächster Artikel Development of Analytical Models to Estimate Pile Setup in Cohesive Soils Based on FE Numerical Analyses

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Titel: Three-Dimensional Back-Analysis of an Instrumented Shallow Tunnel Excavated by a Conventional Method
verfasst von: Mohamed Nabil Houhou
Fabrice Emeriault
Émilie Vanoudheusden
Publikationsdatum: 23.05.2016
Verlag: Springer International Publishing
Erschienen in: Geotechnical and Geological Engineering / Ausgabe 4/2016
Print ISSN: 0960-3182
Elektronische ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-016-0031-9

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