1,721,105 research outputs found
Comportamento meccanico a taglio di discontinuità in roccia soggette ad azioni di tipo dinamico
No full textTraduzione delle "Raccomandazioni ISRM per la determinazione della resistenza a taglio"
No full textTraduzione dei suggerimenti ISRM per la determinazione della resistenza a taglio di discontinuità in rocci
Nuovi sviluppi dello studio sulla resistenza a taglio di discontinuità in roccia soggette ad azioni dinamiche
No full textGeomechanical modeling to study the effects of slope instability on buildings: a case study in northern Italy
No full textThe study of natural phenomena such as landslides requires reducing the problem to a simple scheme that is possible to solve with the available numerical methods. This is called a geo-mechanical model. The difficulty to obtain a realistic model of a landslide due to the variability of the main parameters and the frequent lack of experimental data is well known.
The geo-mechanical modelling of a landslide comprises three main steps: the geological model, the geotechnical model and the stability analysis. The aim of this paper is to point out the objects and the critical points of every step with reference to a real case study. The problem described in the paper is a case of heavy damage induced in the structures of a broadcasting facility by slope instability. The facility is located on the top of a hill in Northern Italy, adjacent to an active quarry. The case was studied with the aim to ascertain the causes that induced the damages and to put in safety the facility due to the reason that even little movements of the broadcasting antenna could induce a variation of the broadcasting signal with important financial losses
Sviluppo di un modello meccanico per l'analisi del crollo di seracchi di ghiaccio
No full textIl crollo di seracchi di ghiaccio rappresenta una potenziale fonte di rischio in ambiente montano. La massa glaciale può infatti generare valanghe di ghiaccio ed innescare valanghe di neve che possono interessare fondovalle antropizzati. La previsione di tali fenomeni è difficile in quanto i modelli numerici richiedono un elevato livello di conoscenza della massa glaciale. In questo articolo, gli autori propongono un nuovo modello meccanico che consente una valutazione speditiva dell’istante di crollo della fronte glaciale. Un esempio applicativo è riportato a chiusura del testo
Stability Analysis of a Rock Column in Seismic Conditions
No full textAbstract The stability of a rock column located on a high conglomerate cliff in Roverino, near Ventimiglia, in northwestern Italy, has been analysed by continuum and discontinuum modelling, in both static and seismic conditions. The rock column, which is 40 m high and nearly 36,000 m3 in volume, exposes the residential area below the cliff, housing more than 4,000 people, to a high risk level. As the area is located in a seismic region with estimated peak acceleration between 0.24 and 0.28 g, the stability analyses were carried out in both static and seismic conditions. Continuum and discontinuum modelling of the rock mass was carried out by using the finite difference methods and the distinct element methods. It is shown that both methods are effective in describing the modes of instability of the rock column in static conditions. On the contrary, a convincing description of the rock column response induced by earthquake excitation is achieved bydiscontinuum modelling
Analisi di stabilità in condizioni statiche e dinamiche di una parete rocciosa allo sbocco di una galleria autostradale: la Rocca di S. Ambrogio in Sicilia.
No full textSome remarks on the evaluation of loading-rate effects on the shear strength of rock joints
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