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Second World Landslide Forum Ð 3-7 October
                2011, Rome




The Cassas Landslide and its impacts on an international
& Olympic transportation corridor: studies, monitoring,
solution and crisis plans

          Franco Oboni, Claudio Angelino, Bartolomeo Visconti
Cassas Landslide, Italy
- Volume 20 - 30 million m3
  - Lenght appx. 1.8 Km
  - Average slope 50 to 55 %
  - Slide depth appx. 60 m
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
Meanwhile the monitoring continued...and in Fall
2000 we witnessed what we had calculated!
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
Cassas Landslide
Rainfall 1998-2002
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
The selected drainage tunnel proved to be a difficult engineering
task due to mountain environment and geotechnical challenges.
The finished tunnel has performed satisfactorily for 5 years now,
draining more than 1300 m 3/mo of water from the slide body with
positive effects in terms of overall stability.
Cassass presentation WLF2 Rome
Cassass presentation WLF2 Rome
• Probabilistic geotechnical analyses have been successfully coupled with
  monitoring data.
• Following calibration and observation good understanding of the parameters
  influencing and dictating the behavior of the slope was achieved.
• The study also aimed at finding a correlation between antecedent rain, net of
  evapo-transpiration, and the slope response, in terms of movements.
• Rains over a period of 300 days were found to display the strongest correlation
  with inclinometers data.
• The strong correlation made it possible to propose a relationship between net
  antecedent rain and the velocity in a given point.
• As a result of the quantitative risk assessment (QRA), a drainage tunnel was
  designed and constructed to mitigate potential reactivations due to water table
  heave in case of long rainy seasons.
• The finished tunnel has drained more than 1300m 3 per month of water during 5
  years from the slide body with positive effects in terms of overall stability.

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Cassass presentation WLF2 Rome

  • 1. Second World Landslide Forum Ð 3-7 October 2011, Rome The Cassas Landslide and its impacts on an international & Olympic transportation corridor: studies, monitoring, solution and crisis plans Franco Oboni, Claudio Angelino, Bartolomeo Visconti
  • 2. Cassas Landslide, Italy - Volume 20 - 30 million m3 - Lenght appx. 1.8 Km - Average slope 50 to 55 % - Slide depth appx. 60 m
  • 7. Meanwhile the monitoring continued...and in Fall 2000 we witnessed what we had calculated!
  • 14. The selected drainage tunnel proved to be a difficult engineering task due to mountain environment and geotechnical challenges. The finished tunnel has performed satisfactorily for 5 years now, draining more than 1300 m 3/mo of water from the slide body with positive effects in terms of overall stability.
  • 17. • Probabilistic geotechnical analyses have been successfully coupled with monitoring data. • Following calibration and observation good understanding of the parameters influencing and dictating the behavior of the slope was achieved. • The study also aimed at finding a correlation between antecedent rain, net of evapo-transpiration, and the slope response, in terms of movements. • Rains over a period of 300 days were found to display the strongest correlation with inclinometers data. • The strong correlation made it possible to propose a relationship between net antecedent rain and the velocity in a given point. • As a result of the quantitative risk assessment (QRA), a drainage tunnel was designed and constructed to mitigate potential reactivations due to water table heave in case of long rainy seasons. • The finished tunnel has drained more than 1300m 3 per month of water during 5 years from the slide body with positive effects in terms of overall stability.