Search results for "KHO"
showing 10 items of 129 documents
L’ultimo sprofondamento a Marsala: l’evento del 21 novembre 2013
2015
The Marsala area, at the western end of Sicily, has been historically interested by quarry activities, both at surface and underground. The carved rocks are Lower Pleistocene calcarenites, defined as “Calcarenite di Marsala” and referred to the Marsala syntheme. The subterranean quarries, now abandoned, show increasing instability signs becoming in time a risk factor for several causes, among which: a) breakdowns due to poor (weak) strength of rock and to large size of voids; b) progressive weathering of rock; c) effects of the discontinuities in the rock mass with the pillars and/or walls of the underground quarries. These factors contributed to enlargement of the subterranean voids and to…
First report on the sinkhole phenomena in the Sicilian evaporites (Southern Italy)
2009
Anthropogenic sinkholes in the Marsala area (western Sicily) linked to underground quarries
2012
Analisi numerica dei processi di instabilità in cave sotterranee
2014
La presenza di estesi sistemi caveali in sotterraneo, utilizzati nel secolo scorso per l’estrazione di materiale da costruzione in diversi contesti del territorio italiano, di frequente determina situazioni di pericolo per l’ambiente antropizzato, a causa dello sviluppo di processi di instabilità, che possono propagarsi verso l’alto, sino a raggiungere la superficie. Specialmente nei casi in cui la memoria storica della presenza ed estensione delle cave sotterranee è andata persa, lo sviluppo urbanistico dei centri abitati nel corso degli ultimi decenni può avere determinato la realizzazione di abitazioni ed infrastrutture al di sopra, o nelle immediate vicinanze, di zone interessate da com…
Mine sinkhole in Siciliy: geomorphologic and environment hazard
2009
Measures of Fuzziness and Information: some challenges from reflections on aesthetic experience
2011
Evaluating aesthetic in arts is, by sheer consensus, a daunting task. Even when all the social, historic and politic considerations are stripped from the living flesh of the piece – and with them most of what differentiates creation from description – the folk concept that beauty stems from some sort of order/chaos relationship, formalized by G. D. Birkhoff as the aesthetic measure, requires an adequate and consistent quantification of both factors. Old and new approaches to the problem generally resort to classical definitions of information and entropy (Shannon entropy, Kolmogorov-Solomonoff complexity) and their derivatives, neglecting the fact that compactness and repetition have a diff…
Lava ribollente nel sottosuolo. Il Čechov di Visconti nella cultura italiana del Novecento
2021
Anton Chekhov is one of the most emblematic figures in the history of theatre. His plays were among the most frequently performed plays during the Twentieth century. The reception of his plays has forged a theatrical genotype that would have led to misunderstandings or altered his assimilation in an instrumental way. But it is in the very nature of the theatre to provoke, disorient, wink, mock, etc., in order to increase the audience’s attention. The lines of Trofimov from The Cherry Orchard have engraved an indelible mark in the audiences of an entire century and beyond, like a boiling lava. Through the analysis of different productions of Chekhov’s plays on various stages, the essay highl…
Analisi numerica dei processi di instabilità in cave sotterranee a Marsala (Sicilia occidentale)
2014
La presenza di estesi sistemi caveali in sotterraneo, utilizzati nel secolo scorso per l’estrazione di materiale da costruzione in diversi contesti del territorio italiano, di frequente determina situazioni di pericolo per l’ambiente antropizzato, a causa dello sviluppo di processi di instabilità, che possono propagarsi verso l’alto, sino a raggiungere la superficie. Specialmente nei casi in cui la memoria storica della presenza ed estensione delle cave sotterranee è andata persa, lo sviluppo urbanistico dei centri abitati nel corso degli ultimi decenni può avere determinato la realizzazione di abitazioni ed infrastrutture al di sopra, o nelle immediate vicinanze, di zone interessate da com…
A three-dimensional back-analysis of the collapse of an underground cavity in soft rocks
2017
Abstract The assessment of stability of man-made underground caves, excavated in the past and later on abandoned, represents a serious challenge for land and urban planning operations, especially for the areas of possible interaction of the caves with overlying structures and infrastructures. Several areas of Southern Italy are characterized by the presence of abandoned underground quarries for the extraction of soft calcarenite rocks, which now threatens the overlying environment due to the risk of collapse and the consequent generation of sinkholes. This work presents a back-analysis of a sinkhole occurred in 2011 in the town of Marsala, caused by the collapse of an underground quarry, as…
The last sinkhole at Marsala: the 21 November, 2013,event
2014
Marsala area, in the western end of Sicily, has been historically interested by quarry activities, both at surface and underground. The carved rocks are Lower Pleistocene calcarenites, defined as “Calcarenite di Marsala” and referred to the Marsala syntheme. These calcarenites are composed of three main lithofacies with vertical and lateral passages: a)coarse to fine yellow bio- and lithoclastic calcarenites, rich in macrofossils; b) sands; and c) gray sandy clays. According to previous authors, the calcarenitic lithofacies can be divided into three lithotypes: i) coarse calcarenites and calcirudites strata, from 10 to 100 cm thick; ii) fine to coarse calcarenites with thickened grains; iii…