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Interaction sol-structure lors d'opérations de microtunnelage

Abstract : This work comes within the scope of the « Microtunnels » French National Project. The microtunneling technique is a trenchless process for installing small diameter pipes. It consists in jacking pipe elements behind the boring machine performing excavation, spoil removal and steering operations. The main advantage of this recent method is a reduction in disturbances compared to traditional open-trench techniques. Therefore, it is especially useful and adapted in urban areas.
This experimental study principally focuses on the main aspects of the technique:
- soil/pipe interface friction,
- face stability
- ground movements induced by microtunneling technique.
In the first part, the complete monitoring at several microtunneling sites is reported. In particular, encountered soils are characterised (through in-situ and laboratory tests) and the main jacking and steering data are monitored. The in depth analysis of these data shows the great influence of ground nature, overcut, lubrication and pipe misalignments on mobilised friction. However, the respective contribution of each of the aforementioned parameters is not clearly identified. Face stability and ground movements are also observed and analysed.
Based on these in-situ results, a complementary experimentation has been designed and set up. Pipe jacking has been reproduced in a calibration chamber with a detailed and precise procedure and a full monitoring of ground displacements in the vicinity of the pipe and the pipe's displacements and stresses. The influence of overcut, lubricant injection on the mobilised friction and the associated ground movements is precisely evaluated. In addition, The overcut effect has been simulated by numerical 2D calculations in order to use them to in-situ conditions.
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Contributor : Annabelle Phelipot-Mardelé <>
Submitted on : Thursday, September 18, 2003 - 6:32:59 PM
Last modification on : Wednesday, July 8, 2020 - 12:42:19 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:30:10 PM

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  • HAL Id : tel-00003398, version 1

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Annabelle Phelipot. Interaction sol-structure lors d'opérations de microtunnelage. Sciences de l'ingénieur [physics]. INSA de Lyon, 2000. Français. ⟨tel-00003398⟩

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