Geotechnical assistant to the client for the construction of the South-East section of the line 15

Geotechnical assistant to the client for the construction of the South-East section of the line 15


Société du Grand Paris

Time frame


Project description

The south-east section of line 15 (section T2 of the red line) of the Grand Paris Public Transport Network is located between the stations of Noisy-Champs and Villejuif Louis Aragon. This 26km section includes, for example, eight stations, a range of ancillary works (including ventilation shafts) and two maintenance yards at Champigny and Vitry sur Seine.

The notable geotechnical challenges encountered included:

  •   Ground with poor geotechnical characteristics
  •   Alteration of geotechnical layers below a quaternary covering
  •   Swelling soils
  •   High permeability
  •   Decompressed or empty areas related to gypsum dissolution
  •   Karst phenomena
  •   The presence of underground quarries and backfilled sand extraction pits
  •   Groundwater under pressure

Services provided

Assistant to the Client during the geotechnical surveying phase G2, including:

  • Monitoring and control of the geotechnical surveys and tests being undertaken
  • Updating the geotechnical model
  • Preparation of the geotechnical summary report for the project, including the project parameters to be used
  • The identification of the risks and the development of the general approach to geotechnical design for the project

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