Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 8 6 2008 10.5194/nhess-8-1441-2008 http://www.nat-hazards-earth-syst-sci.net/8/1441/2008/ http://www.nat-hazards-earth-syst-sci.net/8/1441/2008/nhess-8-1441-2008.html http://www.nat-hazards-earth-syst-sci.net/8/1441/2008/nhess-8-1441-2008.pdf 1441 1450 2008-12-17 Use of the event tree to assess the risk reduction obtained from rockfall protection devices D. Peila daniele.peila@polito.it C. Guardini Department of Land, Environment and Geo-Engineering – Politecnico di Torino, Italy The paper presents and discusses a procedure for the evaluation of the collective risk that can affect a road subjected to rockfalls, with and without protection measures, by means of the event tree analysis. This tool is useful to show designers whether the rockfall protection structures are located in the correct positions, whether they are the correct technological choice and what level of reduction of risk can be obtained. Different design options can therefore be compared on the same bases. Bell, R. and Glade, T.: Quantitative risk analysis for landslides – Examples from Bíldudalur, NW-Iceland, Nat. Hazards Earth Syst. Sci., 4, 117–131, 2004. Benjamin, J R. and Cornell, C A.: Probability, statistics and decision for civil engineers, McGraw-Hill, New York, 684~pp., 1970. Borter, P.: Risikoanalyse bei gravitativen Naturgefahren, edited by: Bundesamt für Umwelt, Wald und Landschaft, Bern, Umwelt-Materialen Nr 107/II, 1999 (in German). Budetta, P.: Assessment of rockfall risk along roads, Nat. Hazards Earth Syst. Sci., 4, 71–81, 2004. Bunce, C M., Cruden, D M., and Morgenstern, N R.: Assessment of the hazard from rockfall on a highway, Can. Geotech\. J., 34, 344–356, 1997. Cancelli, A. and Crosta, G.: Hazard risk assessment in rockfall prone areas, in: Proceedings conference on risk and reliability in ground engineering, edited by: Skip, B O., Thomas Telfors, London, 177–190, 1993. Cancelli, A. and Crosta, G.: Previsione e prevenzione per frane da crollo: descrizione del fenomeno e analisi del rischio. Convegno su previsione e prevenzione di movimenti franosi rapidi, Trento, 5–18, 1999 (in Italian). Casale, M., Oggeri, C., and Peila, D.: Improvements of safety conditions of unstable rock slopes through the use of explosives, Nat. Hazards Earth Syst. Sci., 8, 473–481, 2008. Crosta, G B. and Agliardi, F.: A methodology for physically based rockfall hazard assessment, Nat. Hazards Earth Syst. Sci., 3, 407–422, 2003. Crosta, G., Frattini, P., and Sterlacchini, S.: Valutazione e gestione del rischio da frana. Principi e metodi, in: Valutazione della pericolosità e del rischio da frana in Lombardia, Regione Lombardia, Milano, 180~pp., 2001 (in Italian). Derron, M.-H., Jaboyedoff, M., and Blikra, L H.: Preliminary assessment of rockslide and rockfall hazards using a DEM (Oppstadhornet, Norway), Nat.\ Hazards Earth Syst. Sci., 5, 285–292, 2005. Duncan, C W. and Norman, I N.: Stabilization of rock slopes. Landslides investigations and mitigation, Special Report 247, Transportation Research Board, National Research Council, Washington, 474–506, 1996. Dussauge, C., Grasso, J R., and Helmstetter, A.: Statistical analysis of rockfall volume distributions: Implications for rockfall dynamics, J.\ Geophys. Res., 108(B6), 2286, doi:10.1029/2001JB000650, 2003. Evans, S G. and Hungr, O.: The assessment of rockfall hazard at the base of tulus slopes, Can. Geotech. J., 30(4), 620–636, 1993. Giani, G P.: Rock Slope Stability Analysis, Balkema, Rotterdam, 361~pp., 1992. Guardini, C., Oggeri, C., and Peila, D.: Analisi di rischio di caduta massi su infrastrutture viarie, Le~Strade, 12, 100–106, 2006 (in Italian). Guzzetti, F., Reichenbach, P., and Wieczorek, G F.: Rockfall hazard and risk assessment in the Yosemite Valley, California, USA, Nat. Hazards Earth Syst. Sci., 3, 491–503, 2003. Hoek, E.: Practical Rock Engineering, 115–136, available at:www.rocscience.com(last access: 16 September 2008), 2000. Hudson, J A.: Rock Engineering Systems: Theory and Practice, Ellis Horwood, 186~pp., 1992. ISTAT. Statistica degli incidenti stradali. Anni 2003–2004, available at: www.istat.it, the last access: 16 September 2008. Jaboyedoff, M., Dudt, J P., and Labiouse, V.: An attempt to refine rockfall hazard zoning based on the kinetic energy, frequency and fragmentation degree, Nat. Hazards Earth Syst. Sci., 5, 621–632, 2005. JCSS – Joint Committee on Structural Safety: Probabilistic assessment of existing structures, Rilem publications, Bagneux, France, 176~pp., 2001. Lateltin, O., Heamming, C., Raetzo, H., and Bonnard, C.: Lanslide risk management in Switzerland, Landslides, Springer-Verlag, 2, 313–320, 2005. Lateltin, O.: Prise en compte des dangers dus aux mouvements de terrain dans le cadre des activités de l'aménagement du territoire, Recommandations, OFEFP, 42~pp., 1997 (in French). Locatelli, L.: Analisi del rischio di caduta massi lungo un tratto della Gardesana Occidentale, Geoingegneria Ambientale e Mineraria, GEAM, XLII(1), 33–44, 2005 (in Italian). Mazzoccola, D. and Hudson, J.A.: A comprehensive method of rock mass characterization for indicating natural slope instability, Q. J. Eng.\ Geol., 29, 37–56, 1996. Mazzoccola, D. and Sciesa, E.: La methodologia RHAP (Rockfall Hazard Assessment Procedure, in: Programme Interreg IIc – "Falaises", Prévention des mouvements de versants et des instabilités de falaises, edited by: Carere, K., Ratto, S., and Zanolini, F., 79–96, 2001 (in Italian). Mazzoccola, D.: La metodologia RES, in: Programme Interreg. IIc – "Falaises", Prévention des mouvements de versants et des instabilités de falaises, edited by: Carere, K., Ratto, S., and Zanolini, F., Confrontation des méthodes d'études des éboulements rocheux dans l'arc alpin, 79–96, 2001 (in Italian). Mölk, M. and Poisel, R.: Rock fall risk rating for settlements: development of a rating system based on a case study, Proceedings of Interdisciplinary Workshop on Rockfall Protection, edited by: Volkwein, A., Labiouse, V., and Schellenberg, K., Morschach, Switzerland, 78–80, 2008. Nielsen, N M., Hartford, D N D., and MacDonald, J J.: Selection of tolerable risk criteria for dam safety decision making, Proc. 1994 Canadian Dam Safety Conference, Winnipeg, Manitoba, Vancouver: BiTech Publishers, 355–369, 1994. Oggeri, C. and Tosco, P.: Identificazione del rischio per eventi di caduta massi, GEAM, 23–32~Marzo~2005 (in Italian). Peckover, F L. and Kerr, W G.: Treatment and maintenance of rock slopes on transportation routes, Can. Geotech. J., 14(4), 487–507, 1977. Peila, D., Oggeri C., and Baratono, P.: Barriere paramassi a rete: interventi e dimensionamento, Quaderni di studi GEAM n 25, 90–101, 2006 (in Italian). Peila, D., Oggeri, C., and Castiglia, C.: Ground reinforced embankments for rockfall protection: design and evaluation of full scale tests, Landslides, Springer-Verlag, 4, 255–265, 2007. Peila, D., Pelizza, S., and Sassudelli, F.: Evaluation of behaviour of rockfall restraining nets by full scale tests, Rock Mechanics and Rock Engineering, Springer-Verlag, 31(1), 1–24, 1998. Pelizza, S., Peila, D., and Oggeri, C.: Tipologie di intervento per la bonifica di versanti rocciosi, Conference: "Bonifica di versanti rocciosi per la protezione del territorio", Trento, GEAM, Torino, 9–44, 2004 (in Italian). Pierson, L A., Davis, S A., and Van~Vickle, R.: Rockfall Hazard Rating System Implementation Manual. Federal Highway Administration (FHWA) Report FHWAOR-EG-90-01, FHWA, US Department of Transportation, Washington, DC, 80~pp., 1990. Raetzo, H., Lateltin, O., Bollinger, D., and Tripet, J P.: Hazard assessment in Switzerland – Code of practice for mass movements, B. Eng. Geol.\ Environ., 61, 263–268, 2002. Rouiller, J D., Jaboyedoff, M., Marro, C., Phlippossian, F., and Mamin, M.: Pentes instables dans le Pennique valaisan, Rapport final PNR31, VDF, Zurich, 239~pp., 1998. The Kiewit Center for Infrastructure and Transportation Oregon State University: Stopping sight distance and decision sight distance, available at: www.oregon.gov, September~2004. UN/ISDR – International Strategy for Disaster Reduction: Terminology of disaster risk reduction, available at: www.unisdr.org(last access: 16 September 2008), 1994. Vengeon, J M., Hantz, D., and Dussauge, C.: Prédictibilité des éboulements rocheux: approche probabiliste par combinaison d'études historiques et géomécaniques, Revue Française de Géotechnique, 95/96, 143–154, 2001. Wieczorek, G F., Morrissey, M M., Iovine, G., and Godt, J.: Rockfall hazards in the Yosemite Valley, US Geological Survey, Open-File Report 98/467, 8, 1998. Wieczorek, G F., Stock, G M., Reichenbach, P., Snyder, J B., Borchers, J W., and Godt, J W.: Investigation and hazard assessment of the 2003 and 2007 Staircase Falls rock falls, Yosemite National Park, California, USA, Nat. Hazards Earth Syst. Sci., 8, 421–432, 2008. Wilhelm, C.: Wirtschaftlichkeit im Lawinenschutz, Eidgenössisches Institut für Schnee- und Lawinenforschung, Davos, Mitteilungen SLF~54, 1997 (in German). Wilhelm, C.: Kosten-Wirksamkeit von Lawinenschutzmassnahmen an Verkehrsachsen, edited by: Bundesamt für Umwelt, Wald und Landschaft, Praxishilfe, Bern, 77~pp., 1999. Zischg, A., Fuchs, S., Keiler, M., and Stötter, J.: Temporal variability of damage potential on roads as a conceptual contribution towards a short-term avalanche risk simulation, Nat. Hazards Earth Syst. Sci., 5, 235–242, 2005.