There are only a few non-destructive techniques available to observe and quantify the patterns of local deformation of soil masses and the details of soil-reinforcement interaction. Among them the x-ray radiography is a promising tool because it allows to penetrate reinforced geomaterials and to record images of their internal state while minimizing both the disturbance and the boundary effects on the observed mechanism. Moreover, with this technique, it is possible to determine quantitatively the internal state of the composite material, subjected to boundary loads. An experimental study was carried out on a two-layer soil system reinforced at the interface by a geotextile. The experimental setup was conceived to represent a plane strain state of deformation and static loads were applied on the surface of the model by small increments. The x-ray technique was used to observe the field of internal deformation and to analyze the details of the soil-reinforcement mechanism. Small lead shots, embedded in the model, were employed as displacement markers for both the soils and the reinforcing geotextile.

The results obtained on both reinforced and unreinforced systems show that the x-ray radiography is a powerful means to be used to improve our understanding of soil-reinforcement interaction.

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AUTORI: Pardi L. Bourdeau P.L. Recordon E. RIG ANNO: 1989 NUMERO: 3 Numero di pagina: 117



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