Sahofika Hydropower Project, Madagascar

Dilatometer and Hydraulic Fracturing Tests

As part of the site investigation for the Sahofika Hydropower Project in Madagascar, Solexperts France SARL was subcontracted by Lageotec to carry out in-situ dilatometer tests and hydraulic stress measurements in five vertical to sub-vertical exploratory boreholes up to 240 m deep. The main objective of the hydraulic fracturing tests was to determine the magnitude and orientation of the stress regime acting in the rock mass (in particular the minimum principal stress) for design purposes.

Test programme

Between February and March 2019, the following tests were performed:

  • ten hydraulic fracturing tests, 9 of which together with impression packers 
  • hydraulic packer tests (permeability, pore water pressures)
  • dilatometer tests (elastic modulus of the rock).


Médéric Piedevache

Engineering Geologist ENSG

Member of the extended executive board
Branch manager Nancy, France

T +33 (0) 3 83 94 04 50

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Gerd Klee


Member of the extended executive board
Branch manager Solexperts GmbH Bochum
Hydrofrac tests / Geomechanical laboratory tests

T +49 (0) 234 90447 15

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Dr. Thomas Trick

Hydrogeologist UPC

Managing director Solexperts AG and branches /
Manager Solexperts France SARL /
Manager Solexperts GmbH

T +41 (0) 44 806 29 29

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