| The Bastardo Basin is one of the
classics Apenninic intermontane basins of central Italy. They are
en-closed tectonic basins (graben and semigraben) with high anthropization,
but with high vulnerability, too (seismic, hydrogeological and
geomorphological).
The paper concerns some aspects about slope instability
in the Bastardo Basin as part of a wider research, which aims to actually
define the characteristics of the liability to landslides of the Apenninic
intermontane basins. In particular lithological, stratigraphical and
hydrogeological conditions are analysed under which a landslide near
village of Barattano has developed.
This mass movement, at different times, produced partial
or total occlusion of the torrent Puglia. Here geognostic investigations
together with laboratory tests and subsequent monitoring of landslide area
were carried out.
A back analysis, based on limit equilibrium solutions
for the factor of safety of the slope, provided the residual strenght
properties of the soil mass along the sliding surface.
The landslide of Barattano is representative of a very
frequent situation (in terms of type, factors and causes of the movement,
possible development of the movement) not only within Bastardo Basin, but
in general within Apenninic intermontane basins, too.
The study of landslide and the design of appropriate
remedial measures are of great importance in terms of prevention and
mitigation of geologic-hydraulic risk in Apenninic intermontane basins. |