“La Sorbella” landslide is a deep-seated landslide that affects a segment of a new national road in central Italy and for this reason it is continuously monitored by fixed-in-place inclinometer probes. Inclinometer profiles highlighted a sliding mass moving on a well-defined and narrow shear band, where the mobilized shear strength is at residual. Historical average rate of movement is very slow (1.0-1.5 cm/year) with trends related to the rainfall seasonal regime. After the three main earthquakes of the 2016 central Italy seismic sequence, a fixed-in-place inclinometer probe clearly registered some permanent displacements experienced by the landslide. This kind of evidences, so rare in the scientific literature, offers a precious opportunity to study the response of large active landslides under seismic conditions. After a description of the site and the registered data, a preliminary back-analysis of the observed phenomenon is pointed out by using the well-known Newmark’s method. Moreover, some considerations about the behaviour of the landslide under strong earthquakes are developed.
Seismic induced displacements of “la sorbella” landslide (Italy) / Ferretti, A.; Fruzzetti, V. M. E.; Ruggeri, P.; Scarpelli, G.. - (2019), pp. 2373-2380. (Intervento presentato al convegno 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019 tenutosi a Roma (Italy) nel 2019) [10.1201/9780429031274].
Seismic induced displacements of “la sorbella” landslide (Italy)
Ferretti A.;Fruzzetti V. M. E.;Ruggeri P.;Scarpelli G.
2019-01-01
Abstract
“La Sorbella” landslide is a deep-seated landslide that affects a segment of a new national road in central Italy and for this reason it is continuously monitored by fixed-in-place inclinometer probes. Inclinometer profiles highlighted a sliding mass moving on a well-defined and narrow shear band, where the mobilized shear strength is at residual. Historical average rate of movement is very slow (1.0-1.5 cm/year) with trends related to the rainfall seasonal regime. After the three main earthquakes of the 2016 central Italy seismic sequence, a fixed-in-place inclinometer probe clearly registered some permanent displacements experienced by the landslide. This kind of evidences, so rare in the scientific literature, offers a precious opportunity to study the response of large active landslides under seismic conditions. After a description of the site and the registered data, a preliminary back-analysis of the observed phenomenon is pointed out by using the well-known Newmark’s method. Moreover, some considerations about the behaviour of the landslide under strong earthquakes are developed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
