1,720,963 research outputs found
Previsione e controllo nel tempo dell'efficacia degli interventi di stabilizzazione in un pendio in frana.
No full textEffetti del drenaggio e delle condizioni climatiche sul regime delle pressioni neutre di un pendio in frana
No full textGli effetti delle modifiche delle condizioni al contorno sulla sicurezza nel tempo dei pendii
No full textSi presentano I risultati delle analisi sviluppate per lo studio della frana che, nell’autunno del 2002, ha causato il danneggiamento e la chiusura al traffico di una delle due corsie della Tangenziale di Messina. La frana ha coinvolto il pendio sovrastante una trincea, ma non è da ricondurre agli effetti dello scavo eseguito per la costruzione della sede stradale, dal momento che essa è stata provocata, essenzialmente, dalle modifiche che con continuità nel tempo sono state apportate al regime delle pressioni neutre nel sottosuolo e dall’applicazione dei carichi rilevanti alla sommità del pendio. Le variazioni della geometria del pendio e delle condizioni ambientali hanno agito come cause scatenanti della frana. Le variazioni della geometria del pendio e delle condizioni ambientali hanno agito come cause scatenanti della frana, innescato meccanismi di rottura che sono stati favoriti dall’orientazione a franapoggio dei piani di stratificazione presenti nelle argille della formazione di base e dalla notevole fragilità che caratterizza il legame resistenza a taglio – spostamenti lungo di essi
Safeguarding the historic town of San Fratello, Sicily
No full textThe paper presents the case history of San Fratello, a small town on the Nebrodi Mountains in Sicily rich in history and with very peculiar environmental and cultural characteristics. Both slopes of the narrow ridge where San Fratello is seated had been affected in 1754, 1922, 1986 and 2010 by very large landslides which caused the failure of a lot of buildings and historical monuments in the town. The paper illustrates the analyses carried out in the 2010 landslide and the design of stabilization works still in progress. Some problematic aspects related to the decision to safeguard San Fratello are discussed
Rockfall hazard assessment of the Monte Gallo Oriented Nature Reserve area (Southern Italy)
Full text linkThe Monte Gallo area is a carbonate relief that develops a significant nature reserve and highly attracts tourism to the urbanized area of the City of Palermo (Southern Italy). The slopes are affected by several rockfall events, which have also caused death, injuries, material damage, and a strong social and economic impact. Here, a detailed geological and geotechnical study to assess the rockfall hazard relating to two sectors of the mount has been carried out. The hazard assessment at the slope scale was performed based on geological, geomorphological, geomechanical, and seismic analysis. Using both analytical and empirical methods and by means of different software, the reconstruction of the propagation areas for the eastern sector of the Mount was possible. Results were used to better understand the overall structure, characterize the rockfall source areas' kinematics, and recognize the basic failure mechanisms. The obtained runout areas were compared with each other and with those of previous studies conducted in a neighboring area, as well as with the corresponding hazard area maps of the official cartography, which is being updated. It is expected to be supplemented with maps derived from empirical models
Mitigazione del Rischio Idrogeologico nel complesso rupestre di C. da Chiafura (Scicli, Sicilia Sud-orientale): esempio di studio geomeccanico intregrato
No full textAnalysis of the Rockfall Phenomena Contributing to the Evolution of a Pocket Beach Area Using Traditional and Remotely Acquired Data (Lo Zingaro Nature Reserve, Southern Italy)
Full text linkThe coastal domain of central western Sicily is characterized by the presence of rocky coasts, which mainly consist of pocket beaches situated between bedrock headlands that constitute ecological niches of great touristic and economic value. In this peculiar morphodynamic system, the sedimentary contributions are mainly derived from the rockfall that affects the back of nearby cliffs or the sediment supply of small streams that flow into it. In this study, we investigated the geomorphological processes and related landforms that contribute to the evolution of a pocket beach area located in a coastal sector of NW Sicily Island. The cliffs in this are affected by several rockfalls, and deposits from these rockfalls also add to the rate of sedimentary contribution. The analysis was conducted through the application of traditional approaches and contemporary methods that have previously been used to forecast the collection of input data in the field, often under difficult conditions due to the accessibility of the sites, and which have been supported by UAV surveys. Through the analysis of the digital models of terrain and orthophotos, geometrical and multitemporal analyses of landforms were carried out. A dedicated software was utilized for the detection of rockfall runout zones and block trajectories and for defining the automatic extraction of rock mass discontinuities. The data were compared with those derived from traditional geomechanical surveys. The availability of the existing and acquired remote sensing data proved essential for this study for both defining the reference geological model and for performing the site-specific analysis of rockfall
Rockfall hazards of Mount Pellegrino area (Sicily, Southern Italy)
Full text linkA map derived by rockfall analysis at Mount Pellegrino is presented herein. The study area is affected by several phenomena of rockfall which caused numerous damage and a strong social and economic impact. Official reports and maps that give a general assessment of rockfall hazard are available in this respect, however, it would be advisable to provide a more specific cartographic support useful for land management and planning. The drafting of new maps showing the rockfall runout areas is an additional tool that may be used in conjunction with the existing maps as a means of risk mitigation and reduction. On the basis of geological, geomorphological, and geomechanical analysis and exploiting the information relating to a landslides inventory obtained by using both analytical and empirical methods, two different rockfall propagation areas were reconstructed. The final thematic map permit to appreciate the differences and similarities between the obtained runout areas
Safeguarding historic towns on hilltops threatened by land sliding: The case of San Fratello in Sicily
No full textThe paper presents the case history of San Fratello, a small town in the Nebrodi Mountains in Sicily rich in history and having very peculiar environmental and cultural characteristics. Both slopes of the narrow ridge where San Fratello lies were affected in 1754, 1922, 1986 and 2010 by very large landslides. The landslide of February 2010 is largely the reactivation of that of 1754. It destroyed many infrastructures and seriously damaged more than 200 buildings and caused the evacuation of 25% of the population. Emergency actions to block regression of uphill movements and secure the buildings and their inhabitants as quickly as possible, were carried out. The sliding slope down to the town was left to its natural evolution. The paper presents the results of the geomorphological and geotechnical analyses recently carried out to understand the whole landslide reactivation mechanisms. It is felt necessary to define an advanced geotechnical model of the landslide for quantitative evaluation of hazard and rational landslide risk management in the area
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