1,721,039 research outputs found
Influence of the Antecedent Long-term Precipitations on the Initial Conditions in a Sloping Pyroclastic Deposit
Full text linkAbstractThe hydrological response of a shallow sloping deposit in unsaturated pyroclastic soils is being monitored since 2002. The area is located in Cervinara, Campania Region (Southern Italy), where a catastrophic flowslide occurred on December 16th, 1999, as a consequence of a 2-day cumulative rainfall of 320 mm causing heavy damage and five deaths. The installed devices provide information about rainfall height, soil suction and, recently, also about volumetric water content at several locations and depths along the slope. The huge number and high quality of data allowed to develop a consistent model about the hydrological slope response and particularly to correlate the antecedent long-term precipitations with the soil matric suction at the beginning of a potential triggering rainfall, focusing on the hydrological conditions that establish in the different seasons. In particular, this can help in assessing the likely initial suction values at the time of a potential triggering rainstorm
Anisotropia delle zone di taglio in argilla
No full textLa nota illustra alcuni risultati sperimentali, che evidenziano il comportamento anisotropo della zona di taglio di una colata in argilliti tettonizzate, nella Valle del Basento
Proprietà e comportamento delle colate in argilla. Tesi per il conferimento del titolo di Dottore di Ricerca in Ingegneria Geotecnica (XVII ciclo). Consorzio istituito tra Università degli Studi di Roma La Sapienza (sede amministrativa), Università degli Studi di Napoli Federico II e Seconda Università degli Studi di Napoli
No full textProprietà e comportamento delle colate in argilla
Full text linkLeonardo Cascini, Cristina Jommi, Renato Lancellott
Experience about landslide-tunnel interaction in tectonized clay shales
No full textStiff tectonized clay shales are widespread in the Apennines chain. Sloping deposits of these structurally complex materials are highly unstable due to their poor mechanical properties. However, mass movements are generally slow thus loss of human lives is unlikely, even though the economic consequences are often severe. In fact, small mountain villages and the same infrastructure that serves such communities are continuously exposed to the danger of losing serviceability and consequent high costs required for maintenance. The analysis of the effects of slope movements on facilities and on single artefacts is a special problem, which deserves specific and targeted approaches. This paper describes some cases concerning the interaction between slow slope movements in tectonized clay shales and tunnels
Anisotropy of a shear zone
No full textThe behaviour of landslides in clay is essentially governed by a shear zone located at the base of the soil mass. While some data regarding the shear zones of slides are available, information is rather poor about the shear zones of mudslides. The paper reports some results of investigations on the shear zone located at the base of a mudslide, showing the strong hydraulic and mechanical anisotropy of the material
The interplay between slope movements and pore pressures in fine-grained materials
No full textThe analysis of the behaviour of natural slopes is generally performed in the assumption of fully drained conditions. In contrast, investigations of mudslides suggest that undrained conditions can periodically establish, mainly in stages of mobilisation or acceleration. The paper reports the results of some simple numerical analyses supported by data obtained from monitoring, aimed at assessing the role of excess pore pressures on the landslide behaviour
The mechanics of mudslides as a cyclic undrained-drained process
No full textData collected by monitoring suggest that movement of mudslides essentially develops through alternating stages of undrained-drained deformation. Undrained conditions are established as a consequence of landslide mobilisation or reactivation. Every acceleration phase is followed by progressive deceleration associated with dissipation of excess pore pressure. The paper reports the results of some simple numerical analyses performed in order to investigate the role of pore pressure on the mudslide behaviour
Analisi del processo di infiltrazione in un deposito granulare indotto dagli eventi meteorici stagionali
No full textLa nota illustra alcuni risultati di una sperimentazione numerica finalizzata alla quantificazione dei flussi
idraulici indotti dalle forzanti atmosferiche stagionali in un deposito di terreni piroclastici sciolti, il cui regime
tensiometrico è monitorato in automatico con un’elevata risoluzione temporale
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