http://www.cnr.it/ontology/cnr/individuo/prodotto/ID41568
Evaluation of seismic effects on the landslide deposits of Monte Salta (Eastern Italian Alps) using distinct element method. (Articolo in rivista)
- Type
- Label
- Evaluation of seismic effects on the landslide deposits of Monte Salta (Eastern Italian Alps) using distinct element method. (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Marcato G.; Fujisawa K.; Mantovani M.; Pasuto A.; Silvano S.; Tagliavini F.; Zabuski L. (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Scopus (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Fujisawa K., PWRI, Public Works Research Institute, Erosion and Sediment Control, Tsukuba, Japan
Zabuski L., IHEPAS, Institute of Hydro-Engineering of the Polish Academy of Sciences, Gdansk, Poland (literal)
- Titolo
- Evaluation of seismic effects on the landslide deposits of Monte Salta (Eastern Italian Alps) using distinct element method. (literal)
- Abstract
- The aim of the paper is to present the modelling
of the ground effects of seismic waves on a large debris deposit
lying on a steep mountain slope, with particular attention
paid to the potential triggering of slope movements.
The study site is a mass of 2.5 million m3 rock fall deposit,
named \"Monte Salta Landslide\", located on the northern
slope of the Vajont valley, at the border between Veneto
and Friuli Venezia Giulia regions in north-eastern Italy.
Several historical landslide events were reported in the
area in the past, first one dating back to the 17th century. The
landslide deposit completely mantles the slope with a thick
cover of rock blocks.
The Mt. Salta landslide is conditioned by the presence of
Mt. Borg`a regional thrust, which uplifts Jurassic limestone
on the top of Cretaceous rock units. Above the thrust zone,
folded and highly fractured rock mass dips steeply towards
the slope free face, producing highly unstable setting.
The study area has been classified as high seismic hazard
and different vulnerable elements can be affected by the
remobilisation of debris, among which a village, a national
road and a big quarry that was opened, with the intent to
exploit the part of the landslide deposit for construction purposes.
In this study, numerical analysis was performed, to simulate
the slope behaviour using distinct element method and
applying UDEC code. The 2-D models were built on three
cross-sections and elasto-plastic behaviour was assumed,
both for rock matrix and discontinuities. The earthquake effect
was modelled in pseudo-dynamic way, i.e. by magnifying
the acceleration and applying also its horizontal component.
The expected seismic acceleration in the study area was
calculated on the basis of previous studies as equal to 0.28 g.The results proved that the increase of the vertical component
alone has a small influence on the deformational
behaviour of the system. Hence, the acceleration vector
was deviated at 5 and then at 10 from the vertical. A
small increment of the displacement was observed in the first
case, whereas very large movements occurred in the second.
Therefore, it can be concluded that, besides the magnitude
of the earthquake, even small seismic waves in horizontal
direction could trigger significant movements and therefore
hazardous conditions. The modelled scenario should be helpful
for planning of the functional countermeasure works and
civil defence evacuation plan. (literal)
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