This paper presents the results of seepage tests conducted in the laboratory and in situ in view of estimating the effect of stresses on the percolation through a micaschist. Description of the laboratory device is followed by analysis of the flow variations versus the normal and shear stresses, the loading path (hysteresis), time (creep) and the type of fluid (water or air). In situ, after a brief description of the experimental set-up, the quantity of flow percolating around the test borehole is studied versus the stress normal to the schistosity plane direction. A synthesis of the results is presented as a conclusion.

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