cassass presentation wlf2 rome
DESCRIPTION
This example, that we presented at the WLF2 Conference in Rome, constitutes a complete and fully developed which included the following phases:probabilistic behaviour forecast,behaviour monitoring (which luckily allowed to actually “see happen” what we had predicted a few years earlier),Risk Based Decision Making (RBDM), and finallyimplementation of mitigative and crisis management plan.Interestingly, in a curious turn of events, while doing some reconnaissance work on the landslide, two of us almost lost our lives in a helicopter crash. Risk managers are unfortunately not immune to risks...and somehow it was a good lesson for us to be in the “victim role” that day.TRANSCRIPT
![Page 1: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/1.jpg)
The Cassas Landslide and its impacts on an international& Olympic transportation corridor: studies, monitoring,solution and crisis plans
Second World Landslide Forum Ð 3-7 October2011, Rome
Franco Oboni, Claudio Angelino, Bartolomeo Visconti
![Page 2: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/2.jpg)
Cassas Landslide, Italy - Volume 20 - 30 million m3
- Lenght appx. 1.8 Km- Average slope 50 to 55 %- Slide depth appx. 60 m
![Page 3: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/3.jpg)
![Page 4: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/4.jpg)
![Page 5: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/5.jpg)
![Page 6: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/6.jpg)
![Page 7: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/7.jpg)
Meanwhile the monitoring continued...and in Fall 2000 we witnessed what we had calculated!
![Page 8: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/8.jpg)
![Page 9: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/9.jpg)
![Page 10: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/10.jpg)
Cassas LandslideRainfall 1998-2002
![Page 11: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/11.jpg)
![Page 12: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/12.jpg)
![Page 13: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/13.jpg)
![Page 14: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/14.jpg)
The selected drainage tunnel proved to be a difficult engineeringtask 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 withpositive effects in terms of overall stability.
![Page 15: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/15.jpg)
![Page 16: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/16.jpg)
![Page 17: Cassass presentation WLF2 Rome](https://reader034.vdocuments.net/reader034/viewer/2022052315/5570d943d8b42afb678b4836/html5/thumbnails/17.jpg)
¥ • Probabilistic geotechnical analyses have been successfully coupled withmonitoring data.
• Following calibration and observation good understanding of the parametersinfluencing and dictating the behavior of the slope was achieved.
• The study also aimed at finding a correlation between antecedent rain, net ofevapo-transpiration, and the slope response, in terms of movements.
• Rains over a period of 300 days were found to display the strongest correlationwith inclinometers data.
• The strong correlation made it possible to propose a relationship between netantecedent rain and the velocity in a given point.
• As a result of the quantitative risk assessment (QRA), a drainage tunnel wasdesigned and constructed to mitigate potential reactivations due to water tableheave in case of long rainy seasons.
• The finished tunnel has drained more than 1300m 3 per month of water during 5years from the slide body with positive effects in terms of overall stability.