The use of pressurerneterforthe evaluation of the mechanical characteristics of flysch formations

One of the limits of the use of laboratory geotechnical tests for the mechanical characterization of flysch formations is connected to the representative of soil or rock samples, because the heterogeneity, the anisotropy and the complex geostructural order of flysch formations strongly affect their large scale mechanical behaviour. To obtain reliable results it is necessary to use test procedures that could involve a large portion of the soil or rock mass, so that it can be considered representative of the material characteristic and of their geostructural order. This paper presents the experience of a pressuremeter test campaign executed on flysch formations largely outcropping in the Italy Southern Apennine. Pressuremeter tests have made it possible to highlight the different mechanical behaviour of the various lithotypes constituting the flysch, contributing to clarifying how they affect the mechanical behaviour of the whole flysch formation. Le comportement mécanique des flysch formationes largement afflourant das l’ Italie du Sud est analysé par le pressiometre Menard. On a pu mettre en évidence la variabilité de résistance et déformabilité des differents lithotypes. On a pu contribuer, enfin, a déterminer 1 influence de chaque lithotype sur le comportement global des flysch. In der vorliegenden Arbeit wird das mechanisches Verhalten der Flysch-Erdboden, der in Süd-Italien in großen auftaucht, durch das Menard Pressiometer studiert. Die durchgeführte Land-untersuchung hat die Veränderlichkeit der Festigkeit und der Verformung der untersuchende Flysch aufgezeigt. Es ist außerdem der verschiedene einfluß der lithologischer Element über das mechanisches Verhalten des Flysches deutilich gemacht.